Asymmetric Total Syntheses of (−)-Lycoramine, (−)-Lycoraminone, (−)-Narwedine, and (−)-Galanthamine
作者:Satyajit Majumder、Abhinay Yadav、Souvik Pal、Arindam Khatua、Alakesh Bisai
DOI:10.1021/acs.joc.2c00420
日期:2022.6.17
A concise asymmetric total synthesis of naturally occurring Amaryllidaceae alkaloids sharing dihydrobenzofuran scaffolds, (−)-galanthamine (1a), (−)-lycoramine (1b), (−)-narwedine (2a), and (−)-lycoraminone (2b), is reported. Orthoester Johnson–Claisen rearrangement of allyl alcohol (+)-9 (98% ee) in diisopropylethylamine furnished enantioenriched cyclohexene (+)-8 (97.4% ee) with a quaternary stereogenic
一种简明的不对称全合成天然石蒜科生物碱共享二氢苯并呋喃支架、(-)-加兰他敏 ( 1a )、(-)-lycoramine ( 1b )、(-)-narwedine ( 2a ) 和 (-)-lycoraminone ( 2b ) , 被报道。烯丙醇 (+)- 9 (98% ee) 在二异丙基乙胺中的 Orthoester Johnson-Claisen 重排提供对映体富集的环己烯 (+)- 8 (97.4% ee) 和季立体中心。