HCID 86720235, compound → HCID 86720234, compound

Participants

Reaction Conditions

Reaction Steps

Crude 17α-hydroxy-21-allylcarbonyloxy-pregna-4,9(11)-diene-3,20-dione was dissolved in 15 g of trifluoroethyl octadecanoate and 150 ml of tetrahydrofuran, the resulting solution was added with 4 g of Bacillus subtilis protease and the suspension was stirred for 2 days at 45° C., adding further protease at regular time intervals to 3 g total. The protease was filtered off, the filtrate was removed under vacuum and the residue was chromatographed on a silica gel column with a dichloromethane/methanol 99:1 mixture. The less polar fraction was evaporated off to obtain a residue of 17α-octadecanoyloxy-21-allylcarbonyloxy-pregna-4,9(11)-diene-3,20-dione.

Provenance & Evidence