Aska Pharmaceutical Co., Ltd.

Norihito Isomura

Hiroshi Uchida

Akira Asagarasu

Yosuke Takenaka

Provided is a process for producing a compound, which has an oxo group specifically introduced on the 15-position of a steroid skeleton and which is useful as an intermediate, with a high yield without complicated steps. A compound represented by the formula (2) is allowed to react with an oxidant (e.g., a hypervalent iodine compound) and a co-oxidant (e.g., a peroxide) to produce a 15-oxosteroid compound represented by the formula (1), which is useful as an intermediate: wherein Rto Rare the same or different and each represent a halogen atom, an alkyl group, a haloalkyl group, an alkoxy group, or a haloalkoxy group, Rrepresents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an acyl group, or an alkoxycarbonyl group, Rrepresents a hydrogen atom, an alkyl group, or an acyl group, Rrepresents a hydrogen atom, an alkyl group, an acyl group, or a sulfonyl group, X represents an oxygen atom (O) or a methylene group (CH).

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Kanagawa, Japan

Norihito Isomura