Use of acetate as a leaving group in palladium-catalyzed nucleophilic substitution of benzylic esters
作者:Masashi Yokogi、Ryoichi Kuwano
DOI:10.1016/j.tetlet.2007.06.157
日期:2007.8
The palladium complex prepared in situ from [Pd(η3-C3H5)(cod)]BF4 and bidentate phosphine DPPF was a good catalyst for the nucleophilicsubstitution of benzyl acetate. Significant acceleration of the palladium-catalyzedsubstitution was observed when an alcohol was employed as a reaction solvent. The palladium catalyst was effective for the benzylation of various stabilized carbanions, amines, and
钯在从[钯(η原位络合物制备的3 -C 3 H ^ 5)(COD)] BF 4和双齿膦DPPF是一个很好的用于乙酸苄酯的亲核取代的催化剂。当将醇用作反应溶剂时,观察到钯催化的取代的显着加速。钯催化剂可有效地用于各种稳定化碳负离子,胺和苯亚磺酸盐的苄基乙酸酯的苄基化反应。
Palladium-Catalyzed Nucleophilic Benzylic Substitutions of Benzylic Esters
作者:Ryoichi Kuwano、Yutaka Kondo、Yosuke Matsuyama
DOI:10.1021/ja037735z
日期:2003.10.1
A palladium complex generated in situ from [Pd(eta3-C3H5)(cod)]BF4 and DPPF is a good catalyst for benzylic alkylation of benzyl methyl carbonate with the carbanion of dimethyl malonates. The catalytic reaction is applicable to a wide range of the benzylations of benzylic esters with malonates. The catalytic activity was heavily affected by the bite angle of the bidentate phosphine ligand on palladium
Synthesis of a <i>C</i><sub>2</sub>-Symmetric Chiral Borinic Acid and Its Application in Catalytic Desymmetrization of 2,2-Disubstituted-1,3-Propanediols
作者:Jian Song、Wen-Hua Zheng
DOI:10.1021/jacs.3c02331
日期:——
synthesis of efficient chiral boronic acids remains a formidable challenge. Herein we disclose a rational design and a concise synthesis of a series of novel C2-symmetric disubstituted boronic acids, or borinic acids. Chiral borinic acids have been found to be excellent agents that can achieve highly enantioselective desymmetrization of 2,2-disubstituted-1,3-propanediols, providing chiral diols with a quaternary
Palladium-Catalyzed Benzylation of Active Methine Compounds without Additional Base: Remarkable Effect of 1,5-Cyclooctadiene
作者:Ryoichi Kuwano、Yutaka Kondo
DOI:10.1021/ol048540e
日期:2004.9.1
The palladium complex prepared from DPPF and Cp(eta(3)-C3H5)Pd is an effective catalyst for the alkylation of active methine compounds with benzylic carbonates under neutral conditions. The addition of 1,5-cyclooctadiene brought about remarkable improvement in the lifetime of the palladium catalyst, which led to high yields of the desired benzylation products.