Catalytic, Enantioselective N-Acylation of Lactams and Thiolactams Using Amidine-Based Catalysts
作者:Xing Yang、Valentina D. Bumbu、Peng Liu、Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Wei Zhang、Xuntian Jiang、K. N. Houk、Vladimir B. Birman
DOI:10.1021/ja306766n
日期:2012.10.24
contrast to alcohols and amines, racemic lactams and thiolactams cannot be resolved directly via enzymatic acylation or classical resolution. Asymmetric N-acylation promoted by amidine-based catalysts, particularly Cl-PIQ 2 and BTM 3, provides a convenient method for the kinetic resolution of these valuable compounds and often achieves excellent levels of enantioselectivity in this process. Density
4-Substituted 2-azetidinones were obtained in excellent yields from the reaction of various cuprates with 4-acetoxy-2-azetidinone.
从各种铜酸盐与4-乙酰氧基-2-氮杂环丁酮的反应中,以优异的产率获得了4-取代的2-氮杂环丁酮。
Kinetic Resolution of β-Lactams via Enantioselective N-Acylation
作者:Xing Yang、Valentina D. Bumbu、Vladimir B. Birman
DOI:10.1021/ol201911z
日期:2011.9.16
Enantioselective N-acylation of 4-aryl-beta-lactams in the presence of acyl transfer catalyst CI-PIQ provides an effective method for their nonenzymatic kinetic resolution.
COMPOSITION INCLUDING MULTIPLE FUNCTIONALIZED POLYMERS
申请人:Bridgestone Corporation
公开号:EP2004744A1
公开(公告)日:2008-12-24
[EN] COMPOSITION INCLUDING MULTIPLE FUNCTIONALIZED POLYMERS<br/>[FR] COMPOSITION RENFERMANT DE MULTIPLES POLYMÈRES FONCTIONNALISÉS
申请人:BRIDGESTONE CORP
公开号:WO2007120797A1
公开(公告)日:2007-10-25
[EN] A composition that includes functionalized polymers and particulate filler is provided. The composition includes at least three components: (1) a polymer that includes a first type of functionality such as a functional group including a primary or secondary amine functionality, (2) a polymer that includes a second type of functionality such as an alkoxysilane or other silica interacting functionality, and (3) at least two types of particulate filler. One of the functionalized polymers can be made in the presence of the other. [FR] L'invention concerne une composition qui renferme des polymères fonctionnalisés et une charge particulaire. La composition de l'invention comprend au moins trois composants: (1) un polymère comportant un premier type de fonctionnalité, par exemple un groupe fonctionnel à fonctionnalité amine primaire ou secondaire; (2) un polymère comportant un second type de fonctionnalité, par exemple une fonctionnalité alcoxysilane ou une autre fonctionnalité interagissant avec la silice; et (3) au moins deux types de charge particulaire. L'un des polymères fonctionnalisés peut être fabriqué en présence de l'autre.