An enantioselective approach to (−)-aphanorphine featuring a stereoselective oxidative amidation
作者:Sunil V. Pansare、Kaivalya G. Kulkarni
DOI:10.1039/c3ra44037k
日期:——
synthesis of (−)-aphanorphine (91% ee), that culminates with the preparation of (+)-O-methyl aphanorphine, was achieved. The methodology involves the diastereoselective synthesis of a key 3,5-disubstituted pyrrolidinone intermediate by the intramolecular oxidative amidation of a suitably functionalized α-hydroxy pentenoic acid derivative. A late-stage N-formyl protection, which functions as a latent
(-)-Aphanorphine(91%ee)的形式对映选择性合成得以完成,最终以(+)- O-甲基Aphanorphine的制备而告终。该方法包括通过适当官能化的α-羟基戊烯酸衍生物的分子内氧化酰胺化,非对映选择性地合成关键的3,5-二取代的吡咯烷酮中间体。用作潜在的N-甲基基团的后期N-甲酰基保护被用作保护基团转换和随后与本方法有关的所有其他Aphanorphine合成中实现的N-甲基化策略的简单替代物。