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以 A-失碳雄甾-17 β-醇-2-酮(3)为原料,于30℃炔化后所得产物与 KOH/EtOH 回流,产物再经一次炔化,可使2β-乙炔基取代物收率提高至69%。
Starting from acenaphtheno-androstane-17β-ol-2-one (3), the product obtained after acetylation at 30 ° C was refluxed with KOH / EtOH and the product was alkyne once again to substitute 2β-ethynyl The yield increased to 69%.