作者:David Y.W. Lee、Wu-Yan Zhang、Vishnu Vardhan R. Karnati
DOI:10.1016/s0040-4039(03)01715-5
日期:2003.9
We completed the first total synthesis of puerarin (1), an isoflavone C-glycoside. The key intermediate, β-d-glucopyranosyl-2,6-dimethoxybenzene (9), was obtained by coupling of a lithiated aromatic reagent (3) with pyranolactone (2) in 56% yield. Condensation of (16) with p-methoxybenzaldehyde gave the chalcone (17). The protected chalcone (18) was cyclized to (19) in the presence of Tl(NO3)3. Demethylation
我们完成了葛根素(1)(异黄酮C-糖苷)的第一个全合成。关键中间体β-d-吡喃葡萄糖基-2,6-二甲氧基苯(9)是通过将锂化芳族试剂(3)与吡咯内酯(2)偶联以56%的收率获得的。将(16)与对-甲氧基苯甲醛缩合,得到查耳酮(17)。在Tl(NO 3)3存在下,将受保护的查尔酮(18)环化为(19)。(19)的去甲基化是通过与TMSI在CH 3中回流来完成的。CN得到葛根素(1)。