A process for making a known 6-methyl, 19-nor-pregna-4, 6-diene, 3.20-dione which begins with formylating a 3-alcoxy, 19-nor-pregna-3,5,17(20)-triene at the 6 position. The 6-formylated derivative is reduced to yield a 6-hydroxy methylated derivative, which is in turn dehydrated to a 3-keto, 6-methylenic derivative. The 3-keto derivative is then isomerized to a 3-keto, 4,6,17-pregnatriene. This latter triene is then coverted to the known product by reaction with a bis-hydroxylating agent and a catalyst based on osmium tetroxide. Optionally, the product can be acylated at the 17-alpha position. The process reduces the cost of producing the known product by allowing it to be manufactured from starting materials less costly than those previously required.
一种制备已知的6-甲基,19-去孕烷-4,6-二烯,3.20-二酮的工艺,该工艺始于对3-烷氧基,19-去孕烷-3,5,17(20)-
三烯在6位进行甲酰化。6-甲酰化衍
生物被还原以产生6-羟甲基衍
生物,随后脱
水为3-酮,6-亚甲基衍
生物。3-酮衍
生物然后异构化为3-酮,4,6,17-孕
三烯。这后一个
三烯然后通过与一种双羟基化试剂和基于
四氧化锇的催化剂反应转化为已知的产物。可选地,在17-α位置对产物进行酰化。该工艺通过允许使用比以前所需的起始材料更便宜的材料来制造已知的产物,从而降低了生产成本。