除了已知的类固醇(3型)脱水产物外,7-脱氢胆固醇(1:R = C 8 H 17)和麦角固醇(1:R = C 9 H 17)的脱水还包括氯苯醌。生成绿色对醌的一种混合物,其优选衍生自5.6.7.8-四氢和7.8-二氢-6a H-萘[1.2.3 - fg ]乙炔醌-(9.12)(6或7)。他们从添加氯苯醌的Δ出现7.14-在中间脱氢阶段的二烯成组,随后消除HCl和进一步脱氢。电子供体受体复合物被认为是600至700mμ之间长波吸收的原因。
Oxidation with selenium dioxide: the first report of solvent-selective steroidal aromatization, efficient access to 4β,7α-dihydroxy steroids, and syntheses of natural diaromatic ergosterols
Seleniumdioxideoxidation of cholesterol reveals a solvent-dependent product selectivity and facile one-pot synthesis of three derivatives, including aromatic analogues of naturally occurring ergosterol. Efficient access to 4β,7α-dihydroxy cholesterol is described. Analogous chemistry of β-sitosterol and diosgenin is also reported. The protocol is found effective to synthesize two diaromatic ergosterol