[EN] ASYMMETRIC MICHAEL AND ALDOL ADDITION USING BIFUNCTIONAL CINCHONA-ALKALOID-BASED CATALYSTS<br/>[FR] ADDITIONS ASYMETRIQUES DE MICHAEL ET D'ALDOL UTILISANT DES CATALYSEURS BIFONCTIONNELS A BASE DE CINCHONINE
申请人:UNIV BRANDEIS
公开号:WO2005121137A1
公开(公告)日:2005-12-22
One aspect of the present invention relates to quinine-based and quinidine-based catalysts. Another aspect of the invention relates to a method of preparing a derivatized quinine-based or quinidine-based catalyst comprising 1) reacting quinine or quinidine with 5 base and a compound that has a suitable leaving group, and 2) converting the ring methoxy group to a hydroxy group. Another aspect of the present invention relates to a method of preparing a chiral, non-racemic compound from a prochiral electron-deficient alkene or azo compound or prochiral aldehyde or prochiral ketone, comprising the step of: reacting a prochiral electron-deficient alkene or azo compound or prochiral aldehyde or prochiral 10 ketone with a nucleophile in the presence of a catalyst; thereby producing a chiral, non racemic compound; wherein said catalyst is a derivatized quinine or quinidine. Another aspect of the present invention relates to a method of kinetic resolution, comprising the step of reacting racemic chiral alkene with a nucleophile in the presence of a derivatized quinine or quinidine.
Construction of Cyclopentanol Derivatives via Three-Component Coupling of Silyl Glyoxylates, Acetylides, and Nitroalkenes
作者:Gregory R. Boyce、Shubin Liu、Jeffrey S. Johnson
DOI:10.1021/ol2033527
日期:2012.1.20
The three-componentcoupling of Mg acetylides, silylglyoxylates, and nitroalkenes results in a highlydiastereoselective Kuwajima–Reich/vinylogous Michael cascade that provides tetrasubstituted silyloxyallene products. The regio- and diastereoselectivity were studied using DFT calculations. These silyloxyallenes were converted to cyclopentenols and cyclopentitols via a unique Lewis acid assisted Henry
Mg 乙炔化物、乙醛酸甲硅烷基酯和硝基烯烃的三组分偶联导致高度非对映选择性的 Kuwajima-Reich/vinylogous Michael 级联,提供四取代的甲硅烷氧基丙二烯产物。使用 DFT 计算研究了区域选择性和非对映选择性。这些甲硅烷氧基丙二烯通过独特的路易斯酸辅助亨利环化转化为环戊烯醇和环戊醇。环戊醇产物中存在的烯烃官能团可以使用非对映选择性酮羟基化反应进行加工。
A General One-Step Synthesis of β-Nitronitriles
作者:James C. Anderson、Alexander J. Blake、Matthew Mills、Paul D. Ratcliffe
DOI:10.1021/ol801691c
日期:2008.9.18
The unusual beta-nitronitrile functionality was prepared by a simple one-step hydrocyanation of nitroalkenes. These compounds were shown to be precursors to monoprotected 1,3-diamines and 1,3-amino alcohols through the in situ formation of an alpha-cyano-aldenyde.
The Michael addition to nitroolefins of manganese enolates derived from an array of ketones is reported. The desired 1,4-adducts are obtained in high yield and excellent diastereo- and regioselectivity, the sole kinetic adduct being obtained in the case of nonsymmetrical ketones. The effect of a thiourea-type organocatalyst on the addition of several representative nitroolefins to the kinetic manganese enolate derived from isopropyl ethyl ketone is also reported.
The present invention provides a method of making an imidazole-2-thione which comprises the steps of reacting a vicinal diamine with a compound having a thiocarbonyl moiety and oxidizing the resulting reaction product to obtain said imidazole-2-thione.