A process for producing an alpha-acyloxy-alpha beta-unsaturated carbonyl compound and a 20-acyl-oxy-17(20)-methylen-21-al-steroid compound
申请人:NIPPON ZEON CO., LTD.
公开号:EP0306969A2
公开(公告)日:1989-03-15
There are disclosed a process for producing an α-acyloxy-α,β-unsaturated carbonyl compound represented by the general formula (VI):
wherein Ri, R2 and R4 are independently hydrogen atoms or substituted or unsubstituted hydrocarbon residues, or Ri, 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):
wherein R is a hydrocarbon residue, and indicates that the configuration of the acyloxy group and the formyl group bonded to the carbon atom at the 20-position may be either E-configuration or Z-configuration, which comprises oxidizing a propargyl ester represented by the general formula (V):
wherein Ri, R2, R3 and R4 have the same meanings as defined above; an al-steroid compound having the above partial structural formula which is an intermediate for producing a 21-acyloxy-20-keto-delta16-steroid being extremely useful as an intermediate for important corticoids as drugs and obtained by being subjected said al-steroid to isomerization reaction; and a process for producing a 21-acyloxy-20-keto- delta16-steroid which comprises oxidation reaction and isomerization reaction.
本发明公开了一种由通式(VI)代表的α-乙酰氧基-α,β-不饱和羰基化合物的生产工艺:
其中 Ri、R2 和 R4 独立地为氢原子或取代或未取代的烃残基,或 Ri、R2 和 R4 以任选组合形式相互结合时形成一个环,R3 为取代或未取代的烃残基,并表示构型可以是 E-构型或 Z-构型,特别是部分结构式(II)所代表的 20-乙酰氧基-17(20)-亚甲基-21-al-类固醇:
其中 R 是烃残基,并表示酰氧基和与 20 位碳原子结合的甲酰基的构型可以是 E-构型或 Z-构型,这包括氧化通式(V)所代表的丙炔酯:
其中 Ri、R2、R3 和 R4 的含义与上文所定义的相同;具有上述部分结构式的类固醇化合物,它是生产 21-乙酰氧基-20-酮-δ16-类固醇的中间体,作为重要的皮质类药物的中间体极为有用,通过使所述类固醇进行异构化反应而获得;以及生产 21-乙酰氧基-20-酮-δ16-类固醇的工艺,该工艺包括氧化反应和异构化反应。