Stereospecific Dehydroxytrifluoromethoxylation of Alcohols with 2,4-Dinitro(trifluoromethoxy)benzene

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Data may be preliminary. 19 March 2026 V1 Latest version Share on Stereospecific Dehydroxytrifluoromethoxylation of Alcohols with 2,4-Dinitro(trifluoromethoxy)benzene Authors : You Peng , Haijin Guo , Zeting Zhang , Chunlan Song , and Jiakun Li 0000-0002-7361-3372 [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.177389135.59011679/v1 165 views 95 downloads Contents Abstract Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract To fully elucidate the function of trifluoromethoxy group in drug discovery and materials science, the efficient preparation of stereodefined analogues is essential. The established dehydroxytrifluoromethoxylation reaction, while synthetically useful, follows an S N 1 mechanism and consequently produces racemic products. Herein, we report a stereospecific S N 2 dehydroxytrifluoromethoxylation reaction. This protocol employs readily available 2,4-dinitro(trifluoromethoxy)benzene (DNTFB) as a trifluoromethoxide source and fluoro- N,N,N’,N’ -tetramethylformamidinium hexafluorophosphate (TFFH) as a dual activator. TFFH activates the alcohol for isouronium formation and provides fluoride to liberate the CF 3 O - anion from DNTFB. This stereospecific method offers a highly efficient, low-cost, and broadly applicable strategy for the late-stage modification of complex drug molecules. Cite this paper: Chin. J. Chem. 2026 , 44 , XXX—XXX. DOI: 10.1002/cjoc.202600XXX Stereospecific Dehydroxytrifluoromethoxylation of Alcohols with 2,4-Dinitro(trifluoromethoxy)benzene You Peng a , Haijin Guo a , Zeting Zhang a , Chunlan Song a * and Jiakun Li a,b * a State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China b State Key Laboratory of Natural and Biomimetic Drugs, Peking University University, Beijing 100191, China Trifluoromethoxylation | Alcohols | Deoxyfunctionalizatio n | 2,4-Dinitro(trifluoromethoxy)benzene | Nucleophilic substitution Comprehensive Summary To fully elucidate the function of trifluoromethoxy group in drug discovery and materials science, the efficient preparation of stereodefined analogues is essential. The established dehydroxytrifluoromethoxylation reaction, while synthetically useful, follows an S N 1 mechanism and consequently produces racemic products . Herein, we report a stereospecific S N 2 dehydroxytrifluoromethoxylation reaction. This protocol employs readily available 2,4-dinitro(trifluoromethoxy)benzene (DNTFB) as a trifluoromethoxide source and fluoro- N,N,N’,N’ -tetramethylformamidinium hexafluorophosphate (TFFH) as a dual activator. TFFH activates the alcohol for isouronium formation and provides fluoride to liberate the CF 3 O⁻ anion from DNTFB. This stereospecific method offers a highly efficient, low-cost, and broadly applicable strategy for the late-stage modification of complex drug molecules. Background and Originality Content The introduction of fluorine atoms or fluoroalkyl groups into organic compounds is a routine practice in medicinal and agricultural chemistry. [1-4] This approach leverages the notable properties of fluorine, often termed its ”magic effect”, to accelerate the discovery of viable lead compounds in drug development. [5-8] Among fluoroalkyl substituents, trifluoromethoxy group (CF 3 O) has been extensively investigated due to its high electronegativity (χ = 3.7 on the Pauling scale) and potent lipophilicity (Hansch parameter π = +1.04). [9,10] Despite significant interest, a full comprehension of its structure-activity relationships is hindered by limited synthetic access to trifluoromethoxylated compounds. [11-34] This is particularly evident in the difficulty of preparing stereodefined analogues, an essential yet unmet goal. [35-44] For instance, isoxazolidine-derived inhibitors of receptor-interacting protein kinase 1 (RIPK1) demonstrate a ten-fold difference in activity between their trifluoromethoxylated diastereomers (Scheme 1A). [45] The direct trifluoromethylation of alcohols offers an ideal route to stereodefined trifluoromethyl ethers due to their widespread availability and stereochemical diversity. [46] In fact, the formation of an O−CF 3 bond is inherently difficult, as the hard nucleophilic oxygen poorly engages with electrophilic trifluoromethylating reagents. Established methods using Umemoto’s, Togni’s, or Toste’s reagents often suffer from harsh conditions, require excess alcohol, and exhibit limited substrate scope. [47-51] Although Qing and co-workers reported an improved silver-mediated oxidative protocol with TMSCF 3 (Ruppert–Prakash reagent) for various alcohols, it necessitates stoichiometric silver salts. [52,53] Therefore, a dehydroxytrifluoromethoxylation of alcohol with a nucleophilic trifluoromethoxylating reagent is a viable alternative. A key challenge in this trifluoromethoxylation is the instability of the CF 3 O⁻ anion, which decomposes to carbonyl fluoride (CF 2 =O). [54] Moreover, the alcoholic hydroxyl group is a poor leaving group. [55] Tang circumvented this by using trifluormethyl sulfonates (TFMS) to generate CF 3 O⁻ anion in situ, where the resultant carbonyl fluoride activates alcohols for a subsequent dehydroxylative nucleophilic trifluoromethoxylation. [56-58] Separately, Xiao and coworkers have described a dehydroxytrifluoromethoxylation promoted by a R 3 P/ICH 2 CH 2 I system. [59] Critically, both methods proceed via an S N 1 pathway, leading to racemic products—a significant limitation for functional analysis in drug discovery (Scheme 1B). To achieve stereocontrol, a mechanistic switch from an S N 1 to S N 2 pathway is necessary. This stereospecific dehydroxytrifluoromethoxylation requires the concomitant design of a novel trifluoromethoxylating reagent and an appropriate activation protocol. [60,61] Among potential reagents, 2,4-dinitro(trifluoromethoxy)benzene (DNTFB) is particularly attractive due to its commercial availability and low cost. [62] However, its utility has remained largely limited to the trifluoromethoxylation of alkyl halides and arynes, or to the dehydroxytrifluoromethoxylation of activated benzylic and allylic alcohols (Scheme 1C). [63-66] Inspired by an S N 2 dehydroxyfunctionalization mechanism mediated by fluoro- N,N,N’,N’ -tetramethylformamidinium hexafluorophosphate (TFFH) or its derivatives, [67-72] we hypothesized that TFFH could serve as a dual activator for both alcohol and DNTFB. In this appoach, TFFH activates the alcohol toward isouronium formation while also providing a fluoride ion to liberate the CF 3 O⁻ anion from DNTFB, thereby enabling stereospecific dehydroxytrifluoromethoxylation of non-activated alcohols (Scheme 1D). This method provides a first protocol for the preparation of optically pure alkyl trifluoromethyl ethers from alcohols under mild and operational simple conditions, allowing for its utility in the late-stage functionalization of complex drug molecules. Scheme 1 Strategies to the synthesis of trifluoromethyl ethers from alcohols Results and Discussion Initial experiments were permored with 3-(benzyloxy)propan-1-ol ( 1a) as the model substrate and DNTFB as the trifluoromethoxylation reagent. The optimal reaction conditions were achieved using DNTFB (3.0 equiv), TFFH (2.0 equiv), and CsF (3.0 equiv) in DMA (0.067 M). The reaction protocol involved stirring at 30 °C for 10 minutes, then heating to 100 °C for 4 hours (Table 1, entry 1). Control experiments confirmed the critical roles of both TFFH and CsF for this transformation (Table 1, entries 2-3). TFFH activates the alcohol for isouronium formation and provides fluoride to liberate the CF 3 O⁻ anion from DNTFB anion, a dual role not fulfilled by other tetramethylurea-based activators or AlkylFlour (Table 1, entries 4-7). Investigation of the TFFH stoichiometry identified 2.0 equivalents as optimal. Reduced (1.0 equiv) or increased (3.0 equiv) loadings resulted in lower yields (Table 1, entries 8, 9), likely due to incomplete substrate activation or competing side reactions, respectively. In parallel, CsF is required both to supply fluoride for DNTFB activation and to act as a base; its replacement with NaF, KF, AgF or Cs 2 CO 3 resulted in diminished or undetectable product formation (Table 1, entries 10-13). This reaction proved highly sensitive to solvent choice. DMF afforded a moderate yield, wehereas NMP and DMSO were ineffective (Table 1, entries 14-16). Table 1 Optimization of the reaction conditions a 1 None 76% 2 Without TFFH n.d. 3 Without CsF n.d. 4 HBTU instead of TFFH 14% 5 HATU instead of TFFH trace 6 AlkylFluor instead of TFFH trace 7 TCFH instead of TFFH 6% 8 TFFH (1.0 equiv) 50% 9 TFFH (3.0 equiv) 59% 10 NaF instead of CsF n.d. 11 KF instead of CsF 36% 12 AgF instead of CsF 42% 13 Cs 2 CO 3 instead of CsF 23% 14 DMF as the solvent 30% 15 NMP as the solvent n.d. 16 DMSO as the solvent n.d. a Standard conditions: 1a (0.1 mmol, 1.0 equiv), DNTFB (3.0 equiv), TFFH (2.0 equiv), CsF (3.0 equiv), DMA (0.067 M) at 30 °C for 10 min, then at 100 °C for 4 h. Yields were determined by 19 F NMR with benzotrifluoride as an internal standard. With the optimized conditions established, we proceeded to investigate the substrate scope of this trifluoromethoxylation reaction for various alcohols, as summarized in Scheme 2. The protocol proved effective for a diverse array of unactivated primary alkyl alcohols, which were converted to the desired trifluoromethyl ethers in moderate to good isolated yields, ranging from 55% to 76% ( 1 - 21 ). This encompassed substrates bearing polycyclic aromatic systems such as naphthalene ( 11 ) and heteroaromatic units including thiophene ( 12 ) and carbazole ( 13 ), all of which underwent smooth conversion. Notably, the reaction demonstrated excellent functional group tolerance. A broad spectrum of potentially sensitive moieties remained intact, including ethers ( 1 , 3 ), esters ( 10 ), aldehydes ( 15 ), ketones ( 19 ), cyano groups ( 4 ), silanes ( 5 ), alkenes ( 7 ), alkynes ( 8 ), azides ( 9 ), nitro groups ( 14 ), sulfonyl groups ( 16 ), and various halogens ( 18 , 20 , 21 ). Furthermore, excellent chemoselectivity was achieved, as primary alcohols were selectively trifluoromethoxylated even in the presence of phenolic hydroxyl groups ( 22 ). Activated propargylic alcohols also afforded the corresponding products in moderate yields ( 23 ). The scope extended to unactivated secondary alcohols, albeit with slightly diminished yields ( 24-29 ), a result attributed to competing elimination pathways that generated alkene byproducts (Table S1). Significantly, enantioenriched secondary alcohols reacted with complete and predictable configurational inversion (Figure 1E), confirming stereochemical control within the transformation. To demonstrate practical utility, a gram-scale synthesis of compound 6 was performed under the standard conditions, affording a consistent 67% isolated yield. Given the excellent functional group compatibility, we successfully extended this method to the late-stage functionalization of complex, biorelevant molecules ( 30 - 42 ). Diverse and sophisticated scaffolds—including terpenoid ( 30 ), quinone ( 31 ), steroid ( 35 , 37 ), and several anti-inflammatory drug derivatives ( 33, 34, 38-42 )—were efficiently modified. These results convincingly highlight the generality, robustness, and significant potential of this strategy for applications in synthetic and medicinal chemistry. To elucidate the reaction mechanism, a series of control experiments were performed (Figure 1). The transformation was monitored on-line by NMR spectroscopy to identify and track reactive intermediates (Figure 1A). Activation of alcohol 1a and DNTFB with TFFH and CsF led to the concurrent formation of both the target trifluoromethyl ether 1 and an isouronium intermediate 43 . Over the course of the reaction, intermediate 43 was gradually consumed as product 1 accumulated. These observations prompted a focused study on the role of this key isouronium species in the dehydroxytrifluoromethoxylation process. In a separate experiment, model substrate 1a was treated with TFFH at 30 °C for 10 minutes, generating the isolated isouronium intermediate 43 in nearly quantitative yield (Figure 1B). Subsequent exposure of intermediate 43 to DNTFB and CsF efficiently produced the trifluoromethoxylated product 1 with a 76% yield. To elucidate the reaction pathway and the oxygen source in the product, an 18 O-labeling experiment was performed for 18 O -1a (Figure 1C). Analysis revealed no 18 O incorporation into the final product 1, confirming that the oxygen atom in the trifluoromethoxy group originates exclusively from the reagent DNTFB. Further mechanistic insight was gained by analyzing the fate of the reagents (Figure 1D). Under standard conditions, DNTFB was converted almost quantitatively to 1‑fluoro‑2,4‑dinitrobenzene ( 44 ), consistent with trifluoromethoxide anion release. Concurrently, gas chromatography (GC) analysis quantified tetramethylurea ( 45 ) as the leaving group from TFFH. Finally, the reaction mechanism was corroborated by employing enantiomerically pure alcohol (S) ‑ 46a , which furnished product (R) ‑ 46 with complete stereospecificity (98% enantiospecificity, es) (Figure 1E). This stereochemical inversion provides a solid evidence for an S N 2 pathway. Scheme 2 Substrate scope a a Reaction conditions: alcohols (0.3 mmol, 1.0 equiv), DNTFB (3.0 equiv), TFFH (2.0 equiv), CsF (3.0 equiv), DMA (0.067 M) at 30 °C for 10 min, then at 100 °C for 4 h. b DNTFB (5.0 equiv), CsF (5.0 equiv). c DNTFB (6.0 equiv), CsF (6.0 equiv). Based on the collective experimental evidence, a plausible reaction mechanism is proposed ( Figure 1 F). The reaction initiates with the activation of the alcohol substrate by TFFH, generating the key isouronium intermediate. Concurrently, the reagent DNTFB is activated by CsF or TFFH, releasing the trifluoromethoxide anion along with the leaving group 44. The role of TFFH as fluoride source was confirmed in the placement of CsF with Cs 2 CO 3 for the reaction, albeit with a lower yield (Table 1, entry 13). The CF 3 O⁻ anion then engages in an S N 2-type nucleophilic attack on the isouronium species, displacing tetramethylurea (45) to yield the final trifluoromethyl ether product. Figure 1 Mechanistic investigations. (A) Reaction-time profiles studies on reaction mixture. (B) Isolation and reactivity of the isouronium intermediate. (C) 18 O-labeling experiment. (D) Leaving group analysis. (E) Stereospecific dehydroxytrifluoromethoxylation. (F) Plausible mechanism. Yields of isolated products are given unless otherwise noted. a Yield was determined by 19 F NMR with benzotrifluoride as an internal standard. b Yield was determined by gas chromatography (GC) with N -Methylpyrrolidone as an internal standard. ee, enantiomeric excess. es, enantiospecificity. Conclusions In summary, this work introduces a stereospecific dehydroxytrifluoromethoxylation of alcohols via an S N 2 pathway. The protocol employs readily available DNTFB as a trifluoromethoxide source and TFFH as an activator. It offers a practical and efficient synthesis of chiral trifluoromethyl ethers, characterized by low cost, broad substrate scope, and excellent functional group tolerance. We anticipate that this method will be useful for a variety applications in advancing fluroine-based drug discovery and medicinal chemistry . Experimental A dry 15 mL Schlenk tube equipped with a magnetic stir bar was charged with fluoro- N,N,N’,N’ -tetramethylformamidinium hexafluorophosphate (TFFH, 158.5 mg, 0.6 mmol, 2.0 equiv) and the alcohol substrate (0.3 mmol, 1.0 equiv). Under argon atmosphere, the reaction vessel was added sequentially CsF (136.7 mg, 0.9 mmol, 3.0 equiv), DMA (4.5 ml, c = 0.067 M), and 2,4-dinitro(trifluoromethoxy)benzene (DNTFB, 140 μL, 0.9 mmol, 3.0 equiv). The resulting mixture was stirred at 30 °C for 10 minutes and then heated to 100 °C with stirring for 4 hours. After cooling to room temperature, the reaction mixture was diluted with water (40 ml) and brine (10 ml), extracted with Et 2 O (20 ml × 3), and washed with brine (40 ml). The organic phase was dried over anhydrous Na 2 SO 4 and concentrated under reduced pressure. The residue was purified by flash column chromatography on silica gel or preparative TLC to afford the desired trifluoromethyl ethers. Supporting Information The supporting information for this article is available on the WWW under https://doi.org/10.1002/cjoc.202600xxx. Acknowledgement This work was supported by the National Natural Science Foundation of Hunan Province (2025JJ40012), and the State Key Laboratory of Natural and Biomimetic Drugs. References 1. Zhang, C.; Yan, K.; Fu, C.; Peng, H.; Hawker, C. J.; Whittaker, A. K. 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Manuscript received: XXXX, 2026 Manuscript revised: XXXX, 2026 Manuscript accepted: XXXX, 2026 Version of record online: XXXX, 2026 Left to Right: You Peng, Haijin Guo, Zeting Zhang, Chunlan Song, Jiakun Li Entry for the Table of Contents Stereospecific Dehydroxytrifluoromethoxylation of Alcohols with 2,4-Dinitro(trifluoromethoxy)benzene You Peng, Haijin Guo, Zeting Zhang, Chunlan Song * and Jiakun Li * Chin. J. Chem. 2026 , 44 , XXX—XXX. DOI: 10.1002/cjoc.202600XXX A stereospecific S N 2 dehydroxytrifluoromethoxylation reaction has been established with 2,4-dinitro(trifluoromethoxy)benzene (DNTFB) as a facile trifluoromethoxide source. This method offers a highly efficient, low-cost, and broadly applicable strategy for the preparation of optically pure alkyl trifluoromethyl ethers. Information & Authors Information Version history V1 Version 1 19 March 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords 2 4-dinitro(trifluoromethoxy)benzene alcohols deoxyfunctionalization nucleophilic substitution trifluoromethoxylation Authors Affiliations You Peng Hunan University State Key Laboratory of Chemo/Biosensing and Chemometrics View all articles by this author Haijin Guo Hunan University State Key Laboratory of Chemo/Biosensing and Chemometrics View all articles by this author Zeting Zhang Hunan University State Key Laboratory of Chemo/Biosensing and Chemometrics View all articles by this author Chunlan Song Hunan University State Key Laboratory of Chemo/Biosensing and Chemometrics View all articles by this author Jiakun Li 0000-0002-7361-3372 [email protected] Hunan University State Key Laboratory of Chemo/Biosensing and Chemometrics View all articles by this author Metrics & Citations Metrics Article Usage 165 views 95 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation You Peng, Haijin Guo, Zeting Zhang, et al. Stereospecific Dehydroxytrifluoromethoxylation of Alcohols with 2,4-Dinitro(trifluoromethoxy)benzene. Authorea . 19 March 2026. DOI: https://doi.org/10.22541/au.177389135.59011679/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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