Diazo compounds for the bioreversible esterification of proteins
作者:Nicholas A. McGrath、Kristen A. Andersen、Amy K. F. Davis、Jo E. Lomax、Ronald T. Raines
DOI:10.1039/c4sc01768d
日期:——
A diazo compound is shown to convert carboxylic acids to esters efficiently in an aqueous environment.
一种重氮化合物被证明可以在水性环境中高效地将羧酸转化为酯。
Reagents and methods for esterification
申请人:Wisconsin Alumni Research Foundation
公开号:US10577303B1
公开(公告)日:2020-03-03
A method for esterification of one or more carboxylic acid groups in a compound containing one or more carboxylic acid groups wherein the esterification reagent is a diazo-compound of formula:
wherein the R1 and R2 groups of the diazo compound are selected such that the corresponding organic compound of formula:
exhibits a —C—H pKa value between 18 and 29 as measured in DMSO. Specific reagents and methods for esterification are provided. The esterification reagents provided exhibit high selectivity for esterification of carboxylic acid groups over reaction with amine, alcohol or thiol groups in the compound containing one or more carboxylic acid groups. The method can be used to selectively esterify carboxylic acid groups in peptides or proteins.
Benzylic-acetoxylation of alkylbenzenes with PhI(OAc)2 in the presence of catalytic amounts of TsNH2 and I2
作者:Haruka Baba、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tetlet.2011.06.036
日期:2011.8
Treatment of alkylbenzenes with (diacetoxyiodo)benzene in the presence of catalytic amounts of p-toluenesulfonamide or p-nitrobenzenesulfonamide, and molecular iodine in 1,2-dichloroethane at 60 °C gave the corresponding (α-acetoxy)alkylbenzenes in good to moderate yields. The present reaction is a simple method for the introduction of an acetoxy group to the benzylic position of alkylbenzenes.
Copper-catalyzed benzylic oxidation of C(sp3)–H bonds
作者:Bo Zhang、Shou-Fei Zhu、Qi-Lin Zhou
DOI:10.1016/j.tet.2012.12.046
日期:2013.2
A selective oxidation of benzylic C(sp3)–H bonds to C(sp3)–O bonds catalyzed by copper complexes of quinoline–imine ligands was developed with peresters as oxidants under mild reaction conditions, which converted benzylic methylenes directly into benzylic alcohols and esters by means of direct C–H bond functionalization.
The synergy between a nature-inspired ionic solvent and Mo(CO)6, as a solid source of carbon monoxide, allowed to develop a Pd-catalyzed amino- and alkoxycarbonylation under mild reaction conditions and with an improved degree of sustainability.