PROCESS FOR THE PRODUCTION OF 16,17(CYCLOHEXYLMETHYLEN)BIS(OXY)-11,21-DIHYDROXY-PREGNA-1,4-DIEN-3,20-DION OR ITS 21-ISOBUTYRAT BY TRANSKETALISATION

摘要

The invention relates to a process for the preparation of 16,17-[(cyclohexylmethylene)bis(oxy)]-11,21-dihydroxypregna-1,4-diene-3,20-dione[11beta,16alpha(R)] and similar compounds, by reaction of an appropriate 16,17-ketal with cyclohexanealdehyde.