Metaperiodic acid → 21-Chloro-9-fluoro-11beta,17-dihydroxy-16alpha-(2-oxo-2-phenylethoxy)pregna-1,4-diene-3,20-dione

Participants

Reaction Steps

A solution of 4.8 g of 21-chloro-9-fluoro-11β,17-dihydroxy-16α-[(2-phenyloxiranyl)methoxy]pregna-1,4-diene-3,20-dione in 150 ml of tetrahydrofuran is stirred with a solution of 10 g of periodic acid in 40 ml of water for 4 hours. The resulting slurry is diluted with 1 liter of water and filtered. The solid is dried in vacuo and recrystallized from methanol-chloroform to give 2.4 g of 21-chloro-9-fluoro-11β,17-dihydroxy-16α-(2-oxo-2-phenylethoxy)pregna-1,4-diene-3,20-dione, melting point 266°-268°C, dec.

Provenance & Evidence