adducts (VIII) and (VI) formed. Desmosteryl acetate (V) was synthesized by a novel method from 3β-acetoxychol-5-en-24-oic acid (I), the essential steps being preparation of the diazo-ketone (II), its photochemical Wolff rearrangement to the methyl ester (III), a Grignard reaction of (III) with methylmagnesium iodide and dehydration of the product.
22,23-亚甲基stigma-5-en-3β-ol(IX),24,25-亚甲基胆甾-5-en-3β-ol(VII)和24,25-亚甲基-lanost-8-en-3β-ol( XI)是通过用二
氯卡宾处理
豆甾醇,去
甾醇和
羊毛甾醇并还原形成的加合物(VIII)来合成的。用一种新颖的方法由3β-乙酰氧基-5--5-24酸(I)合成
乙酸去
十八烷基酯(V),主要步骤是重
氮酮(II)的制备,其光
化学Wolff重排成甲酯(III),(III)与
甲基碘化镁的格氏反应和产物的脱
水。