Carbon Tetrachloride → 7alpha-Chloro-5,6beta-epoxy-15beta,16beta-methylen-3beta-pivaloyloxy-5beta-androstan-17-one

Participants

Reaction Steps

A solution of 169 g of 5,6β-epoxy-7β-hydroxy-15β,16β-methylene-3β-pivaloyloxy-5β-androstan-17-one in a mixture of respectively 340 ml of dichloromethane, tetrachloromethane, and pyridine is combined with 200 g of triphenylphosphine and stirred for 2 hours at room temperature. The reaction solution is washed with water, dried over sodium sulfate, and evaporated to dryness under vacuum. The residue is stirred up with 310 ml of ethanol and filtered. The filter cake is washed with 175 ml of ethanol and dried under vacuum, thus obtaining 139.2 g of 7α-chloro-5,6β-epoxy-15β,16β-methylene-3β-pivaloyloxy-5β-androstan-17-one. An analytical sample, recrystallized from acetone-hexane, has a melting point of 228° C. [α]D =-100° (chloroform).

Provenance & Evidence