Protecting group improvement by isotopic substitution: synthesis of the quinone system of fredericamycin A
作者:Derrick L.J. Clive、Michel Cantin、Ahmad Khodabocus、Xianglong Kong、Yong Tao
DOI:10.1016/s0040-4020(01)88016-9
日期:1993.9
Use of a trideuteriomethyl group for protection of phenolic oxygen (as in 29, Scheme 4), instead of the classical methyl group, serves to suppress an unwanted intramolecular hydrogen transfer (12→14, Scheme 2) during radical cyclization. The resulting spiro compound (31, Scheme 5) can be converted, by selective demethylation and oxidation, into a substance (35, Scheme 6) that represents the spirodiketone-quinone
使用三氘甲基来保护酚氧(如方案29中的29),而不是经典的甲基,可用于抑制自由基环化过程中有害的分子内氢转移(方案12→14,方案2)。可以通过选择性脱甲基和氧化将所得螺环化合物(31,方案5)转化为代表抗肿瘤药Fredericamycin A的螺二酮-醌系统的物质(35,方案6)。