An effective method for alkoxycarbonylation of (hetero)aryl bromides is developed in the presence of in situ-generated phosphinite ligands tBu2POR (R = nBu, nPr, Et or Me). For this purpose commercially available tBu2PCl was used as the pre-ligand in the presence of different alcohols. For the first time cross coupling reactions with two alcohols – one generating the ligand, the other used as substrate
在原位生成的次膦酸酯配体t Bu 2 POR(R = n Bu,n Pr,Et或Me)存在下,开发了一种用于(杂)芳基溴的烷氧羰基化的有效方法。为此目的,在不同醇存在下,将可商购的t Bu 2 PC1用作预配体。首次开发了与两种醇的交叉偶联反应-一种生成配体,另一种用作底物。通过这种方法,可以以更有效的方式进行配体优化,并且可以以良好的产率和选择性获得所需的产物。
Copper-Catalyzed Synthesis of Esters from Ketones. Alkyl Group as a Leaving Group
The conversion of ketones to esters has been achieved through the use of Cu catalyst and tetrabutylammonium nitrite. This reaction involves the activation of the less activated C-C bond, and the alkyl group is removed as a leaving group. Various isopropyl ketones are found to be good substrates for this reaction.
Decarbonylative Methylation of Aromatic Esters by a Nickel Catalyst
作者:Toshimasa Okita、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/acs.orglett.8b01233
日期:2018.5.18
A Ni-catalyzed decarbonylative methylation of aromatic esters was achieved using methylaluminums as methylating agents. Dimethylaluminum chlorides uniquely worked as the methyl source. Because of the Lewis acidity of aluminum reagents, less reactive alkyl esters could also undergo the present methylation. By controlling the Lewis acidity of aluminum reagents, a chemoselective decarbonylative cross-coupling
Mechanistic insight into the synergistic Cu/Pd-catalyzed carbonylation of aryl iodides using alcohols and dioxygen as the carbonyl source
作者:Junxuan Li、Jinlei Zhou、Yumei Wang、Yue Yu、Qiang Liu、Tilong Yang、Huoji Chen、Hua Cao
DOI:10.1007/s11426-021-1122-6
日期:2022.1
Pd-catalyzed carbonylation, as an efficient synthetic approach for the installation of carbonyl groups in organic compounds, has been one of the most important research fields in the past decade. Although elegant reactions that allow highlyselective carbonylations have been developed, straightforward routes with improved reaction activity and broader substrate scope remain long-term challenges for
Tandem Oxidation of Allylic and Benzylic Alcohols to Esters Catalyzed by N-Heterocyclic Carbenes
作者:Brooks E. Maki、Audrey Chan、Eric M. Phillips、Karl A. Scheidt
DOI:10.1021/ol062940f
日期:2007.1.1
N-heterocyclic carbenes catalyze the oxidation of allylic, propargylic, and benzylicalcohols to esters with manganese(IV) oxide in excellent yields. A variety of ester derivatives can be synthesized, including protected carboxylates. This one-pot tandemoxidation represents the first organocatalytic oxidation of alcohols to esters. Saturated esters can also be accessed from aldehydes using this method