Chelation assisted transmetallation of tetraalkyl tin derivatives: C-metallated lithiocarbamates as d3 reagents for the synthesis of δ-hydroxycarbamates.
Preparation of Methyl <i>N</i>‐Substituted Carbamates from Amides through <i>N</i>‐Chloroamides
作者:Gene A. Hiegel、Tyrone J. Hogenauer
DOI:10.1081/scc-200066695
日期:2005.8.1
Abstract Amides are chlorinated on the nitrogen using trichloroisocyanuric acid, and the N‐chloroamides are then rearranged to the corresponding methyl N‐substituted carbamates by sodium methoxide in methanol.
A novel and efficient (NHC)CuI (NHC=N-heterocyclic carbene) catalyst for the oxidative carbonylation of amino compounds
作者:Shuzhan Zheng、Fuwei Li、Jianming Liu、Chungu Xia
DOI:10.1016/j.tetlet.2007.06.049
日期:2007.8
Oxidativecarbonylation of amino compounds to prepare corresponding 2-oxazolidinones, ureas, and carbamates selectively in the presence of (NHC)CuI without any additives was firstly achieved in good yields and selectivities.
Carbondioxide reacted with aliphatic amines and ortho esters to form carbamicesters in good yields. The influence of different ortho esters on the carbamate synthetic reaction is described. In the case of orthocarbonates, carbamicesters were obtained in high yields. The reaction of carbondioxide, amines, and ortho esters may involve a competitive reaction between the esterification of carbamic
Gold(I)-Catalyzed Intermolecular [2+2] Cycloadditions between Allenamides and Alkenes
作者:Hélio Faustino、Paloma Bernal、Luis Castedo、Fernando López、José L. Mascareñas
DOI:10.1002/adsc.201200047
日期:2012.6.18
3‐(Propa‐1,2‐dien‐1‐yl)oxazolidin‐2‐one works as an efficient two‐carbon partner in a variety of intermolecular gold‐catalyzed [2+2] cycloadditions to alkenes. The transformation represents a simple and practical entry to highly substituted cyclobutane derivatives and takes place with complete regio‐ and stereocontrol.
transesterification of dimethyl carbonate (DMC) with various alcohols and amines, which afforded unsymmetricalorganiccarbonate and carbamate. It was observed that the transesterification was accelerated under pressurized CO2 in this work. The activity is very high and the best result (89% conversion with 98% selectivity to unsymmetricalcarbonate) was obtained for the DBU/alcohol/DMC/CO2 system. The addition of