[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.
Me3SiBr-mediated intramolecular cyclization of γ-functionalized trimethylsilyl nitronates
作者:Alexander A Tishkov、Anton V Kozintsev、Il'ya M Lyapkalo、Sema L Ioffe、Vadim V Kachala、Yuri A Strelenko、Vladimir A Tartakovsky
DOI:10.1016/s0040-4039(99)00985-5
日期:1999.7
The silylation of nitro compounds of general formula X1X2CHCH(Ar)CH2NO2 with at −30°C leads to hitherto unknown 2-(N,N-bis(trimethylsilyloxy)amino-2,3-dihydrofurans (X1=PhCO, X2=H) or to N,N-bis(trimethylsilyloxy)aminocyclopropanes (X1=X2=COOMe). N,N-Bis(trimethylsilyloxy)immonium cations appear to be the key intermediates in this process.
的通式X的硝基化合物甲硅烷基化1 X 2 CHCH(Ar)的CH 2 NO 2与在-30℃通入迄今未知的2-(Ñ,Ñ双(三甲基甲硅烷基)氨基-2,3-二氢呋喃(X 1 = PhCO,X 2 = H)或N,N-双(三甲基甲硅烷氧基)氨基环丙烷(X 1 = X 2 = COOMe)N,N-双(三甲基甲硅烷氧基)铵阳离子似乎是该过程中的关键中间体。
Helical Oligourea Foldamers as Powerful Hydrogen Bonding Catalysts for Enantioselective C–C Bond-Forming Reactions
progress has been made toward the development of metal-free catalysts of enantioselective transformations, yet the discovery of organic catalysts effective at low catalyst loadings remains a major challenge. Here we report a novel synergistic catalyst combination system consisting of a peptide-inspired chiral helical (thio)urea oligomer and a simple tertiary amine that is able to promote the Michael reaction
Immobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene over mesoporous materials: An efficient catalyst for Michael-addition reactions under solvent-free condition
作者:Pranjal Kalita、Rajiv Kumar
DOI:10.1016/j.apcata.2011.03.010
日期:2011.4
Immobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD, a bicylic guanidine base) over mesoporous material like SBA-15 has been found to be an excellent catalyst for Michael-addition of β-nitro styrene with malonate. The reactions were performed under solvent-free condition at 373 K for 9 h. A wide variety of Michael donors and acceptors were investigated. Among them, high yield of Michael product
Highly Enantioselective Michael
Addition of Malonates to Nitroolefins Catalyzed by Chiral
Bifunctional Tertiary Amine-Thioureas Based on Saccharides
作者:Jun-An Ma、Xiao-Juan Li、Kun Liu、Hai Ma、Jing Nie
DOI:10.1055/s-0028-1087370
日期:——
A series of saccharide-derived bifunctional tertiary amine-thioureas for the asymmetric Michaeladdition reaction have been designed and synthesized. The addition products between malonates and various nitroolefins were obtained in high yields (up to 99%) and excellentenantioselectivities (up to 99% ee).