Adducts of 3β-acetoxy- and 1α,3β-diacetoxy-23,24-dinorchola-5,7-dien-22-al (7 and 14) with 4-phenyl-3H-1,2,4-triazole-3,5-dione prepared by the ozonolysis of the corresponding adducts of ergosteryl acetate and 1α-acetoxyergosteryl acetate were transformed into 22-bromo-3β-tetrahydropyranyloxy- and 22-iodo-1α,3β-bis(tetrahydropyranyloxy)-23,24-dinorchola-5,7-diene (11 and 26). The halide derivatives (11 and 26) were coupled with 2-methyl-4-phenylsulfonyl-2-(tetrahydropyranyloxy)butane (6) to afford 23-phenylsulfonyl-3β,25-bis(tetrahydropyranyloxy)- and 23-phenylsulfonyl-1α,3β,25-tris(tetrahydropyranyloxy)cholesta-5,7-diene (12 and 27). The reductive desulfonylation and deprotection of the tetrahydropyranyl group of 12 and 27 provided the title compounds, cholesta-5,7-diene-3β,25-diol (1) and cholesta-5,7-diene-1α,3β,25-triol (2).
3β-acetoxy- 和 1α,3β-diacetoxy-23,24-dinorchola-5,7-dien-22-al(7 和 14)与 4-苯基-3H-1,2,4-triazole-3、通过
臭氧分解
乙酸麦角甾酯和 1α-acetoxyergosteryl acetate 的相应加合物制备的 5-二酮转化为 22-
溴-3β-
四氢吡喃氧基和 22-
碘-1α,3β-双(
四氢吡喃氧基)-23,24-二去甲
胆碱-5,7-二烯(11 和 26)。卤化物衍
生物(11 和 26)与 2-甲基-4-苯磺酰基-2-(
四氢吡喃氧基)
丁烷(6)偶联,得到 23-苯磺酰基-3β,25-双(
四氢吡喃氧基)-和 23-苯磺酰基-1α,3β,25-三(
四氢吡喃氧基)胆甾-5,7-二烯(12 和 27)。对 12 和 27 中的
四氢吡喃基进行还原脱磺和脱保护反应,得到了标题化合物:胆甾-5,7-二烯-3β,25
-二醇(1)和胆甾-5,7-二烯-1α,3β,25-三醇(2)。