Preparation process for 20-keto-21(S) hydroxy steroid compounds

Details Preparation process for 20-keto-21(S) hydroxy steroid compounds Preparation process for 20-keto-21(S) hydroxy steroid compounds

1993-06-02

1995-01-24

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Cyclopentanohydrophenanthrene ring system containing

552552, 552544, 435 52, 435 54, 435 58, C07J 500

Patent

active

053844190

ABSTRACT:
An improved process for the preparation of 20-keto-21(S)-hydroxy steroids of the Formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is alkyl of 1 to 12 carbon atoms, and R.sub.3 is alkyl of 1 to 4 carbon atoms and novel intermediates therefrom.

REFERENCES:
Nuclear Medecine and Biology by Martin G. Pomper, et al. vol. 17, No. 3, 1990 Oxford GB pp. 309-319.

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