Asymmetric Synthesis of (<i>R</i>)-Antofine and (<i>R</i>)-Cryptopleurine via Proline-Catalyzed Sequential α-Aminoxylation and Horner−Wadsworth−Emmons Olefination of Aldehyde
作者:Mingbo Cui、Hongjian Song、Anzheng Feng、Ziwen Wang、Qingmin Wang
DOI:10.1021/jo101510x
日期:2010.10.15
Naturally occurring phenanthroindolizidine alkaloids (R)-antofine and phenanthroquinolizidine alkaloids (R)-cryptopleurine have been synthesized in high optical purity via proline-catalyzed sequential α-aminoxylation and Horner−Wadsworth−Emmons olefination of aldehyde. Both enantiopure forms of proline are commercially available, and thus, in principle, both isomers of antofine and cryptopleurine can