An Efficient Synthesis of Katsube Nitrile: A Key Building Block for Eburnamine-Vincamine Alkaloids
作者:Fener Chen、Xiaofei Chen
DOI:10.1055/s-0033-1340988
日期:——
Abstract A novel synthesis of the Katsube nitrile is achieved via an efficient diastereoselective Pictet–Spengler cyclization of 3-ethyl-2-hydroxy-1-[2-(1H-indol-3-yl)ethyl]-6-oxopiperidine-3-carbonitrile to construct the cis-[CD] rings in 1-ethyl-4-oxo-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizine-1-carbonitrile, and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) catalyzed condensation of tert-butyl 4-
摘要 通过有效的非对映选择性Pictet-Spengler环化3-乙基-2-羟基-1- [2-(1 H-吲哚-3-基)乙基] -6-氧代哌啶-3-的新合成的Katsube腈腈在1-乙基-4-氧代1,2,3,4,6,7,12,12b-八氢吲哚[2,3 - a ]喹啉嗪-1-腈中构建顺-[CD]环,和1,5,7-三氮杂双环[4.4.0]癸-5-烯(TBD)催化4-氰基-4-(羟甲基)己酸叔丁基酯与色胺的缩合反应,从而组装4-氰基-4-(羟甲基)- N- [2-(1 H-吲哚-3-基)乙基]己酰胺是关键步骤。 通过有效的非对映选择性Pictet-Spengler环化3-乙基-2-羟基-1- [2-(1 H-吲哚-3-基)乙基] -6-氧代哌啶-3-的新合成的Katsube腈腈在1-乙基-4-氧代1,2,3,4,6,7,12,12b-八氢吲哚[2,3 - a ]喹啉嗪-1-腈中构建顺-[CD]环,和1