Asymmetric Synthesis of cis-5-tert-Butylproline with Metal Carbenoid NH Insertion
摘要:
The highly stereoselective intramolecular metal carbenoid insertion reaction of sulfinimine-derived delta-amino delta-diazoesters is used to prepare cis-5-tert-butylproline. A concerted or nearly concerted metal carbenoid N-H insertion reaction mechanism is proposed.
Asymmetric Synthesis of cis-5-tert-Butylproline with Metal Carbenoid NH Insertion
摘要:
The highly stereoselective intramolecular metal carbenoid insertion reaction of sulfinimine-derived delta-amino delta-diazoesters is used to prepare cis-5-tert-butylproline. A concerted or nearly concerted metal carbenoid N-H insertion reaction mechanism is proposed.
Asymmetric Synthesis of 2,4,5-Trisubstituted Piperidines from Sulfinimine-Derived δ-Amino β-Ketoesters. Formal Synthesis of Pseudodistomin B Triacetate
作者:Franklin A. Davis、Junyi Zhang、Yingxin Li、He Xu、Charles DeBrosse
DOI:10.1021/jo050373o
日期:2005.7.1
retro-Michael-type elimination to give enantiopure 2,4,5-trisubstituted piperidines, a structural motif found in numerous biologically active alkaloids. This new chiral building block is readily prepared by treating N-sulfinyl δ-amino β-ketoesters with dimethylformamide dimethyl acetal. This new protocol was illustrated with a concise formal asymmetricsynthesis of marine alkaloid pseudodistomin B triacetate