ESTRATRIENE DERIVATIVES COMPRISING HETEROCYCLIC BIOISOSTERES FOR THE PHENOLIC A-RING

The present invention is directed to novel pyrazolo-estrien and triazolo-estrien-derivatives, pharmaceutical compositions containing them and their use in the treatment or prevention of disorders and diseases mediated by an estrogen receptor such as hot flashes, vaginal dryness, osteopenia, osteoporosis, hyperlipidemia, loss of cognitive function, degenerative brain diseases, cardiovascular diseases, cerebrovascular diseases, hormone sensitive cancers and hyperplasia (in tissues including breast, endometrium, and cervix in women and prostate in men), endometriosis, uterine fibroids, osteoarthritis and as contraceptive agents either alone or in combination with a progestogen or progestogen antagonist. The compounds of the invention are selective estrogen receptor modulators.