Efficient and Chirally Specific Synthesis of Phenanthro-Indolizidine Alkaloids by Parham-Type Cycloacylation
作者:Ziwen Wang、Zheng Li、Kailiang Wang、Qingmin Wang
DOI:10.1002/ejoc.200900920
日期:2010.1
A concise, efficient and modular route involving Parham-type cycloacylation as the key step has been used to synthesize six enantiopure phenanthro-indolizidine alkaloids 1a-c. The preparation of enantiomerically pure tylophora alkaloids and their seco analogues on a large-scale is now feasible. The alcohol intermediates 8a-c, which are difficult to prepare by other synthetic methodologies, have been
以 Parham 型环酰化为关键步骤的简洁、高效和模块化的路线已被用于合成六种对映体纯的菲-吲哚里西啶生物碱 1a-c。大规模制备对映体纯的泰洛弗拉生物碱及其类似物现在是可行的。醇中间体8a-c难以通过其他合成方法制备,通过金属化-环化-还原序列以优异的产率合成。