Highly Enantio- and Diastereoselective Mannich Reactions of Glycine Schiff Bases with <i>in situ</i> Generated <i>N</i>-Boc-imines Catalyzed by a Cinchona Alkaloid Thiourea
作者:Haile Zhang、Salahuddin Syed、Carlos F. Barbas
DOI:10.1021/ol902722y
日期:2010.2.19
Highly enantio- and diastereoselective organocatalytic Mannich reactions of glycine Schiff bases with N-Boc-protected imines are described. Imines were generated in situfrom bench-stable α-amidosulfones. Catalysis mediated by a cinchona alkaloid thiourea provided optically active α,β-diamino acid derivatives with up to 99% ee and near-perfect diastereoselection.
Substrate-Controlled Diastereoselectivity Switch in Catalytic Asymmetric Direct Mannich Reaction of Glycine Derivatives with Imines: From<i>anti</i>- to<i>syn</i>-α,β-Diamino Acids
作者:Jorge Hernández-Toribio、Ramón Gómez Arrayás、Juan Carlos Carretero
DOI:10.1002/chem.200902258
日期:2010.1.25
diastereoselectivity switch has been devised in the Fesulphos–CuI‐catalyzed glycine direct Mannich reaction with N‐(8‐quinolyl)sulfonyl imines by tuning the steric and electronic properties of the glycine component (see scheme). α,β‐Diaminoacids of syn configuration are produced under high diastereo‐ and enantiocontrol with glycinate esters derived from electron‐deficient benzophenone‐type ketimines, in contrast
CYCLOPROPENIMINE CATALYST COMPOSITIONS AND PROCESSES
申请人:THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
公开号:US20140288323A1
公开(公告)日:2014-09-25
The present invention provides, inter alia, a cyclopropenimine Brønsted base catalyst and a cyclopropenimine scaffold for use as a Brønsted base catalyst. This cyclopropenimine has the structure (100). Methods for making such a cyclopropenimine are also provided. Further provided are processes for carrying out an organic synthetic reaction and processes for catalyzing a proton transfer reaction enantioselectively using such a cyclopropenimine Brønsted base catalyst.
[EN] CYCLOPROPENIMINE CATALYST COMPOSITIONS AND PROCESSES<br/>[FR] COMPOSITIONS CATALYTIQUES À BASE DE CYCLOPROPÉNIMINE ET PROCÉDÉS
申请人:UNIV COLUMBIA
公开号:WO2013059118A1
公开(公告)日:2013-04-25
The present invention provides, inter alia, a cyclopropenimine Brønsted base catalyst and a cyclopropenimine scaffold for use as a Brønsted base catalyst. This cyclopropenimine has the structure (100). Methods for making such a cyclopropenimine are also provided. Further provided are processes for carrying out an organic synthetic reaction and processes for catalyzing a proton transfer reaction enantioselectively using such a cyclopropenimine Brønsted base catalyst.
Cyclopropenimine-Catalyzed Enantioselective Mannich Reactions of <i>tert</i>-Butyl Glycinates with <i>N</i>-Boc-Imines
作者:Jeffrey S. Bandar、Tristan H. Lambert
DOI:10.1021/ja407277a
日期:2013.8.14
shown to catalyze Mannichreactions between glycine imines and N-Boc-aldimines with high levels of enantio- and diastereocontrol. The reactivity of 1 is shown to be substantially greater than that of a widely used thiourea cinchona alkaloid-derived catalyst. A variety of aryl and aliphatic N-Boc-aldimines are effective substrates for this transformation. A preparative-scale reaction to deliver >90 mmol