Process for preparation of 9.alpha. -chloro-11.beta. formyloxypregna-3.20-diones
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United States of America Patent
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Sep 23, 1997
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N/A
app pub date -
May 31, 1995
filing date -
Mar 16, 1995
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Abstract
Disclosed is a process for producing a compound of the formula: ##STR1## by reacting a compound of the formula: ##STR2## with: (1) a chlorinating reagent selected from an N-chloroimide or an N-chloroamide; (2) an anhydrous strong acid selected from orthophosphoric acid, alkylsulfonic acids, fluoroalkylsulfonic acids or arylsulfonic acids; and (3) anhydrous dimethylformamide; at a temperature within the range of about -78.degree. to about 0.degree. C.
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