Methods for extending the side chain of 20-oxopregnanes were summarized. The possibilities of alkylation of 3-methoxy-19-norpregna-1,3,5(10)-trien-20-one and its 16α,17α-methano and -butano derivatives with alkyl halides in the presence of lithium diisopropylamide were studied. The Claisen—Schmidt condensation of these steroids with aromatic aldehydes resulted in a series of the corresponding 21-benzylidenesteroids. Carrying out the Claisen—Schmidt condensation in an aprotic solvent in the presence of lithium diisopropylamide yielded, in addition to the target 21-benzylidenesteroids, the corresponding 21-benzoyl derivatives — steroidal 1,3-diketones.
本文总结了20-氧代孕烷侧链的延伸方法。研究了在二
异丙基锂存在下,3-甲氧基-19-去甲孕甾-1,3,5(10)-
三烯-20-酮及其16α,17α-
甲烷和
丁烷衍
生物与烷基卤化物发生烷基化反应的可能性。这些类
固醇与芳香醛发生克莱森-施密特缩合反应,生成一系列相应的21-亚苄基类
固醇。在二
异丙基锂存在下,在非质子溶剂中进行克莱森-施密特缩合反应,除了生成目标21-亚苄基类
固醇外,还生成相应的21-苯甲酰衍
生物——类
固醇1,3-二酮。