Process for the preparation of 20-keto-21 alpha-01-steroids

Details Process for the preparation of 20-keto-21 alpha-01-steroids Process for the preparation of 20-keto-21 alpha-01-steroids

1993-06-11

1995-03-21

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540 34, 552524, 552540, 552544, 552546, 552548, 552552, 552553, 552556, 435 51, 435 52, 435 53, 435 55, 435 61, C07J 900, C07J 7500, C07J 3300, C07J 2100

Patent

active

053996852

ABSTRACT:
A process for the preparation of a compound 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, R.sub.3 is alkyl of 1 to 4 carbon atoms comprising reacting a compound of the formula ##STR2## wherein R.sub.4 is a remainder of an easily cleavable ether, K is a protected ketone function in the form of ketal, thioketal or mixed ketal and R.sub.1 has the above definition with a magnesium organic compound reagent of the formula

REFERENCES:
patent: 4181720 (1980-01-01), Marx et al.
patent: 4273771 (1981-06-01), Coussediere

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