| 摘要 |
There are disclosed a process for producing an alpha -acyloxy- alpha , beta -unsaturated carbonyl compound represented by the general formula (VI): <IMAGE> (VI) wherein R1, R2 and R4 are independently hydrogen atoms or substituted or unsubstituted hydrocarbon residues, or R1, R2 and R4, when taken together with one another in an optional combination, form a ring, R3 is a substituted or unsubstituted hydrocarbon residue, and indicates that the configuration may be either E-configuration or Z-configuration, in particular, a 20-acyloxy-17(20)-methylen-21-al-steroid represented by the partial structural formula (II): <IMAGE> (II)
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