Metal-Free Direct Oxidation of Aldehydes to Esters Using TCCA
摘要:
Aromatic and aliphatic aldehydes are simply converted into esters by an efficient oxidative esterification carried out under mild conditions. The aldehydes are converted in situ into their corresponding acyl chlorides, which are then reacted with primary and secondary aliphatic, benzylic, allylic, and propargylic alcohols and phenols. A variety of esters are obtained in high yields.
Palladium-Catalyzed Aerobic Oxidative Direct Esterification of Alcohols
作者:Chao Liu、Jing Wang、Lingkui Meng、Yi Deng、Yao Li、Aiwen Lei
DOI:10.1002/anie.201008073
日期:2011.5.23
One step from alcohol to ester: A palladium‐catalyzed oxidativeesterification of various benzylic alcohols with methanol and long‐chain aliphatic alcohols was carried out in the presence of molecular oxygen as the oxidant (see scheme). By considering the effects of substitution and potential mechanistic pathways, the applicability of this method to a range of different substrates was shown.
Mild Esterification of Carboxylic Acids via Continuous Flow Diazotization of Amines
作者:Clément Audubert、Hélène Lebel
DOI:10.1021/acs.orglett.7b02231
日期:2017.8.18
A new continuousflow protocol for the diazotization of methylamine with 1,3-propanedinitrite in THF is reported. The synthesis of methyl esters was achieved in high yields from a variety of carboxylic acids in 20 min at 90 °C. Additionally, this protocol was extended to other aryl and alkyl amines, namely secondary amines, to produce various substituted esters in high yield using 2-MeTHF as a solvent