thiourea moiety and an amino group on a chiral scaffold. Among them, thiourea 1e bearing 3,5-bis(trifluoromethyl)benzene and dimethylamino groups was revealed to be highly efficient for the asymmetric Michael reaction of 1,3-dicarbonyl compounds to nitroolefins. Furthermore, we have developed a new syntheticroute for (R)-(-)-baclofen and a chiralquaternarycarboncenter with high enantioselectivity by Michael
我们在手性支架上合成了一类带有硫脲部分和氨基的新型双功能催化剂。其中,带有 3,5-双(三氟甲基)苯和二甲氨基的硫脲 1e 被证明对于 1,3-二羰基化合物到硝基烯烃的不对称迈克尔反应非常有效。此外,我们通过迈克尔反应开发了 (R)-(-)-巴氯芬和具有高对映选择性的手性季碳中心的新合成路线。在这些反应中,我们假设催化剂的硫脲部分和氨基分别活化硝基烯烃和 1,3-二羰基化合物,以提供具有高对映选择性和非对映选择性的迈克尔加合物。
Development of a Catalytic Enantioselective Conjugate Addition of 1,3-Dicarbonyl Compounds to Nitroalkenes for the Synthesis of Endothelin-A Antagonist <b>ABT-546</b>. Scope, Mechanism, and Further Application to the Synthesis of the Antidepressant Rolipram
作者:David M. Barnes、Jianguo Ji、Michael G. Fickes、Michael A. Fitzgerald、Steven A. King、Howard E. Morton、Frederick A. Plagge、Margo Preskill、Seble H. Wagaw、Steven J. Wittenberger、Ji Zhang
DOI:10.1021/ja026788y
日期:2002.11.1
The enantioselectivesynthesis of endothelin-A antagonist ABT-546 has been accomplished via the discovery and development of a highly selective catalyticasymmetricconjugateaddition of ketoesters to nitroolefins. Employing just 4 mol % bis(oxazoline)-Mg(OTf)(2) complex with an amine cocatalyst, we obtained the product nitroketone with 88% selectivity at the aryl-bearing stereocenter and in good yield
Process for preparing optically active nitro compounds and cyano compounds
申请人:Kanto Kagaku Kabushiki Kaisha
公开号:EP1512678A1
公开(公告)日:2005-03-09
[Problem] The problem of the invention is to prepare nitro compounds and cyano compounds in high efficiency and high stereoselectivity by a simple and practical Michael reaction.
[Solution] A process for preparing optically active nitro compounds and cyano compounds representedbythechemical formula (C) using a metal complex, which is obtained by reaction of an optically active nitrogen-containing compound and a periodic table group VIII metal complex, in the asymmetric Michael reaction of a compound represented by the chemical formula (A) and a compound represented by the chemical formula (B) according to the claim 1.
Pd-catalyzed cross-coupling of carboxylic acids with nitroethane via combination of decarboxylation and dehydrogenation
作者:Min Zhang、Jun Zhou、Jian Kan、Min Wang、Weiping Su、Maochun Hong
DOI:10.1039/c0cc01029d
日期:——
An unexpected coupling reaction of arene carboxylicacid with nitroethane via a combination of decarboxylation and dehydrogenation is described. The method provides exclusively (E)-beta-nitrostyrenes.
描述了芳烃羧酸与硝基乙烷通过脱羧和脱氢的组合的意外偶联反应。该方法仅提供(E)-β-硝基苯乙烯。
Enantioselective Michael Reaction of Malonates to Nitroolefins Catalyzed by Bifunctional Organocatalysts
Michael reaction of malonates to nitroolefins with chiralbifunctionalorganocatalysts, bearing both a thiourea and tertiary amino group, afforded Michael adducts with high yields and enantioselectivities (up to 95%, up to 93% ee).