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 <i>cis</i>-5-<i>tert</i>-Butylproline with Metal Carbenoid NH Insertion
作者:Franklin A. Davis、Bin Yang、Jianghe Deng
DOI:10.1021/jo030081s
日期:2003.6.1
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.
Detection and Elimination of Product Inhibition from the Asymmetric Catalytic Hydrogenation of Enamines
作者:Karl B. Hansen、Thorsten Rosner、Michele Kubryk、Peter G. Dormer、Joseph D. Armstrong
DOI:10.1021/ol051862d
日期:2005.10.1
text] The catalytic asymmetric hydrogenation of enamine amides and esters with catalyst Rh-1a, prepared from ferrocenyl based ligand 1a or 1b and [(COD)RhCl](2), has been shown through kinetic studies to suffer fromproduct inhibition. Enamine ester substrates have also been shown to be incompatible with the amine products of the reaction in methanol. In situ protection of the amine products with di-tert-butyl