Zur Stereochemie der Vitamin D3-Epoxide R�ntgenstrukturanalyse einer 5,6-7,8-10,19-Triepoxidverbindung

Bernhard, H.; Kratky, Christoph; Reischl, Wolfgang; Zbiral, E.

doi:10.1007/bf00811255

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Androstanes and Oestranes1

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1986

1995

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“…The reaction of oestrone 2-hydroxyethyl ether (1 32) with isocyanuric chloride, N-chlorosuccinimide, or ethyl chloroiminocarbonate gives 10~-chloro-3,3-ethylenedioxyoestra-1,4dien-17-one (133); the yield is improved if the reaction occurs in the presence of various alcoholsprobably through the formation of mixed ketals. Removal of the protecting group with acid and reaction of the ketone with calcium carbonate in dimethylformamide then yields 9,ll -didehydro-oestrone (1 34)…”

Section: Androstanes and Oestranesmentioning

confidence: 99%