Conclusions
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1.
The transformation of 21-0,N-isopropylidene derivatives of 16α,17α-epiminopregn-5-ene-2β,21-diol-20-one into 20-0,N-isopropylidene derivatives of 16α,17α-epiminopregn-5-ene-3β,20-diol-20-one was discovered, and, based on this, a new variant of the synthesis of 16α,17α-epiminopregn-5-ene-3β,21-diol-20-one-3′,21-diacetate was proposed.
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2.
A new class of steroids with additional tetrahydrofuran and 1′,3 -imidazolidine-2′thione rings E and F, respectively, was synthesized.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2392–2398, October, 1988.
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Turuta, A.M., Kamernitskii, A.V., Fadeeva, T.M. et al. Transformed steroids. 171. Heterocyclization in the 16α,17α-epiminopregn-5-ene-3β,21-diol-20-one series. Russ Chem Bull 37, 2156–2161 (1988). https://doi.org/10.1007/BF00953426
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DOI: https://doi.org/10.1007/BF00953426