Abstract
(+)-12-Fluoro-13,14-dihydroprostaglandin F2.alpha. methyl ester (2a) and (+)-15-epi-12-fluoro-13,14-dihydroprostaglandin F2.alpha. methyl ester (2b) were prepared from the readily available (-)-7-fluorospiro[bicyclo[2.2.1]hept-5-ene2,2''-[1,3]dioxolane]-7-methanol. Fluoroprostaglandins 2a and 2b possess truly significant separations of antifertility activity from smooth-muscle stimulating properties [in hamsters]. The 2a and 2b were totally inert toward the [human] placental 15-hydroxyprostaglandin dehydrogenase.