Useful Enantioselective Bicyclization Reactions Using an N-Protonated Chiral Oxazaborolidine as Catalyst
作者:Gang Zhou、Qi-Ying Hu、E. J. Corey
DOI:10.1021/ol035542a
日期:2003.10.1
[reaction: see text] Nine examples are reported of enantioselective [4 + 2] cycloaddition reactions of achiral, acyclic substrates to form chiral bicyclo[4.3.0]nonane or bicyclo[4.4.0]decane derivatives.
[EN] SUBSTITUTED AZACYLES AS TRMP8 MODULATORS<br/>[FR] AZACYLES SUBSTITUÉS EN TANT QUE MODULATEURS DE TRPM8
申请人:GIVAUDAN SA
公开号:WO2021074281A1
公开(公告)日:2021-04-22
Disclosed are TRPM8 modulators as defined by formula (I) for achieving a cooling effect on skin and mucousa.
公开的是根据公式(I)定义的TRPM8调节剂,用于实现皮肤和粘膜的冷却效果。
Catalytic, Regioselective Hydrocarbofunctionalization of Unactivated Alkenes with Diverse C–H Nucleophiles
作者:Kin S. Yang、John A. Gurak、Zhen Liu、Keary M. Engle
DOI:10.1021/jacs.6b08850
日期:2016.11.9
constructed from two classes of commonly available starting materials, alkenes and carbon-hydrogen (C-H) bonds. The reaction employs a palladium(II) catalyst and utilizes a removable directing group to both control the regioselectivity of carbopalladation and enable subsequent protodepalladation. A wide range of alkenes and C-H nucleophiles, including 1,3-dicarbonyls, aryl carbonyls, and electron-rich aromatics
形成碳-碳 (CC) 键的反应是有机合成的基石,广泛应用于化学科学。我们报告了一种转化,该转化使 CC 键能够由两类常用的起始材料、烯烃和碳氢 (CH) 键构成。该反应使用钯 (II) 催化剂并利用可去除的导向基团来控制碳钯化的区域选择性并实现随后的原脱钯。广泛的烯烃和 CH 亲核试剂,包括 1,3-二羰基化合物、芳基羰基化合物和富电子芳烃,都是可行的反应伙伴,使迈克尔型反应性从 α,β-不饱和羰基化合物扩展到未活化的烯烃。描述了这种转化在药物多样化和天然产物全合成中的应用。
Nuclear analogs of (β-lactam antibiotics. XVIII. A short synthesis of 2-alkylthiocarbapen-2-em-3-carboxylate
作者:Yasutsugu Ueda、Christopher E. Damas、Bernard Belleau
DOI:10.1139/v83-344
日期:1983.9.1
A short synthesis of (±)-2-alkylthiocarbapen-2-em-3-carboxylic acid (2) from sorbic acid via a key intermediate 4 is described.
从山梨酸经过关键中间体4合成(±)-2-烷基硫代卡巴本-2-烯-3-羧酸(2)的简要综述。
Direct Asymmetric Vinylogous and Bisvinylogous Mannich-Type Reaction Catalyzed by a Copper(I) Complex
A direct catalytic asymmetric vinylogous Mannich-typereaction has been disclosed in good yield, excellent regio-, diastereo- and enantioselectivity. The key to control the regioselectivity is the combination of a bulky N-acylpyrazole and a bulky bisphosphine ligand. The catalytic system was extended to a bisvinylogous Mannich-typereaction by changing the ligand. The synthetic utility of the vinylogous