A simple method for the alkaline hydrolysis of esters
作者:Vassiliki Theodorou、Konstantinos Skobridis、Andreas G. Tzakos、Valentine Ragoussis
DOI:10.1016/j.tetlet.2007.09.074
日期:2007.11
A very mild and rapid procedure for the efficient alkalinehydrolysis of esters in non-aqueous conditions has been developed, by the use of dichloromethane/methanol (9:1) as solvent. This method conveniently provides both carboxylic acids and alcohols from the corresponding esters and sodium hydroxide in a few minutes at room temperature. A plausible reaction mechanism is proposed.
Nickel‐Catalyzed Regio‐ and Enantioselective Ring Opening of 3,4‐Epoxy Amides and Esters with Aromatic Amines
作者:Jiawei Liu、Wei Tang、Chuan Wang
DOI:10.1002/chem.202300704
日期:——
A carbonyl-directed regio- and enantioselective ringopening reaction of 2,3-epoxy amides and esters has been developed by use of a chiral nickel/bipyridine complex as the catalyst.
of unactivated alkenes using ethanol as the hydrogen source is described. A new NCP-type pincer iridium complex (BQ-NCOP)IrHCl containing a rigid benzoquinoline backbone has been developed for efficient, mild TH of unactivated C-C multiple bonds with ethanol, forming ethyl acetate as the sole byproduct. A wide variety of alkenes, including multisubstituted alkyl alkenes, aryl alkenes, and heteroatom-substituted
描述了使用乙醇作为氢源实现未活化烯烃的转移氢化 (TH) 的第一种通用催化方法。已经开发出一种新的 NCP 型钳形铱络合物 (BQ-NCOP)IrHCl,其含有刚性苯并喹啉主链,可有效、温和地将未活化的 CC 多键与乙醇进行 TH,形成乙酸乙酯作为唯一的副产品。各种烯烃,包括多取代的烷基烯烃、芳基烯烃和杂原子取代的烯烃,以及含 O 或 N 的杂芳烃和内部炔烃,都是合适的底物。重要的是,(BQ-NCOP)Ir/EtOH 系统在反应性官能团(如酮和羧酸)存在下对烯烃氢化表现出高化学选择性。此外,与 C2D5OD 的反应为氘标记化合物提供了一条便捷的途径。详细的动力学和机理研究表明,单取代烯烃(如 1-辛烯、苯乙烯)和多取代烯烃(如环辛烯 (COE))表现出基本的机理差异。乙醇的 OH 基团在苯乙烯反应中显示出正常的动力学同位素效应 (KIE),但在 COE 的情况下显示出显着的反向 KIE。对
A new efficient decarboxylative reduction of γ-carbamoyloxy-α,β-unsaturated esters with lithium dialkylcuprate
作者:Toshiro Ibuka*、G. -Namg Chu、Fumio Yoneda
DOI:10.1016/s0040-4039(01)91022-6
日期:1984.1
A new synthetically useful decarboxylative reduction of γ-carbamoyloxy-α,β-unsaturated esters with lithium dialkylcuprate under mild condition was described.