[Total synthesis of natural and enantiomer 8-alpha-estrane derivatives and racemic 8-alpha-14-beta- and 8-alpha, 9-beta(=13-alpha)-estrane derivatives]

[Synthesis, structure, and biological properties of some 8alpha-analogues of steroid estrogens with fluorine in position 2]

A total synthesis of 8alpha analogues of steroid estrogens with fluorine in position 2 was achieved. Structural features of these compounds were studied by the example of 17beta-acetoxy-2-fluoro-3-methoxy-8alpha-estra-1,3,5(10)-triene. It was shown that the 8alpha analogues of 2-fluorosubstituted steroid estrogens have a low uterotropic activity and retain the osteoprotective and hypocholesterolemic activities.

Total synthesis of heterocyclic steroids, Part IV. Mass spectrometry in stereochemical determination of the C/D ring fusion geometry in some heteroaromatic steroids

The mass spectral fragmentation pattern and the relative intensities of the fragment peaks of the D ring in some 8-dehydroheteroaromatic steroids were studied. Characteristic differences for the cis and trans isomers were ascertained and were used for the determination of the stereochemistry of thiasteroids of which only one isomer was obtained.

Total synthesis of heterocyclic steroids, Part II. Synthesis of (+/-)-17-thia-3-methoxy-8 alpha, 14 beta-estra-1,3,5(10)-triene-17-dioxide

2-Methyl-3-oxothiophane-1-dioxide (II) was prepared and was used as the D ring precursor in the total synthesis of the title compound via modified Torgov synthesis.

Comparative evaluation of the dissociation rate between the vaginotrophic and uterotrphic activities of 1-hydroxy-1, 3, 5 (10)-estratriene derivatives with natural and unnatural configuration at C8 using ovariectomized mice

Influences on estrogenic.activities of 1-hydroxylation and C8-isomerization in the molecules of naturally occurring estrogens have been studied. All compounds tested behaved qualitatively in the same manner as estradiol, as far as the decrease in the vaginal and uterine sialic acid levels and the increase in the organ weights of the vagina and uterus of castrated mice are concerned. They were, however, different not only in the relative ptoencies of the estrogenic effects, but also in the dissociation rate between the vaginotrphic and uterotrophic activities. Of the compounds tested, 1-hydroxy-8alpha-estrone, 1-hydroxy-8alpha-estradiol and their acetates had a higher value of the dissociation index than that of estriol. These compounds seemed to exert a predominant effect on the vagina rather than on the uterus. Following structural factors seem to be of significance for the dissociation of estrogenic effects: the 1- or 16alpha- hydroxy group and 8alpha-configuration decrease the uterotrophic activity more intensely than the vaginotrophic activity, and the 17alpha-ethinyl group selectively increases the uterotrophic activity.