Calciferol and its relatives. Part XVI. Total synthesis of precalciferol3 2
作者:T. M. Dawson、J. Dixon、P. S. Littlewood、B. Lythgoe、A. K. Saksena
DOI:10.1039/j39710002960
日期:——
The total synthesis of precalciferol3 has been effected without the use of photochemical methods. 9α-Chloro-des-AB-cholestan-8-one 5α-chloro-1β-[(1R)-1,5-dimethylhexyl]-7aβ-methyl-trans-perhydroindan-4-one}(1; X =α-Cl) and (1S)-3-ethynyl-4-methylcyclohex-3-en-1-ol (2; R = H) were combined to give the chlorohydrin (3; X =α-Cl), which was transformed, first into the dienyne (4) and then, by semihydrogenation
钙化固醇3的总合成无需使用光化学方法即可完成。9α-Chloro- des- AB -cholestan-8-one 5α-chloro-1β-[(1 R)-1,5-methyldimethylhexyl]-7aβ-methyl- trans - perhydroindan -4-one}(1; X =将(α-Cl)和(1 S)-3-乙炔基-4-甲基环己-3-烯-1-醇(2; R = H)合并得到氯醇(3; X =α-Cl),首先转化为二烯炔(4),然后通过乙炔键的半氢化反应转化为前钙化甾醇3(5)。描述了与维生素原和相关途径有关的模型实验。