作者:William I. Nicholson、Fabien Barreteau、Jamie A. Leitch、Riley Payne、Ian Priestley、Edouard Godineau、Claudio Battilocchio、Duncan L. Browne
DOI:10.1002/anie.202106412
日期:2021.9.27
The direct mechanochemical amidation of esters by ball milling is described. The operationally simple procedure requires an ester, an amine, and substoichiometric KOtBu and was used to prepare a large and diverse library of 78 amide structures with modest to excellent efficiency. Heteroaromatic and heterocyclic components are specifically shown to be amenable to this mechanochemical protocol. This
PCl<sub>3</sub>-mediated transesterification and aminolysis of <i>tert</i>-butyl esters via acid chloride formation
作者:Xiaofang Wu、Lei Zhou、Fangshao Li、Jing Xiao
DOI:10.1177/1747519820987530
日期:2021.5
A PCl3-mediated conversion of tert-butyl esters into esters and amides in one-pot under air is developed. This novel protocol is highlighted by the synthesis of skeletons of bioactive molecules and gram-scale reactions. Mechanistic studies revealed that this transformation involves the formation of an acid chloride in situ, which is followed by reactions with alcohols or amines to afford the desired
Mizoroki–Heck Reaction of Unstrained Aryl Ketones via Ligand-Promoted C–C Bond Olefination
作者:Mei-Ling Wang、Hui Xu、Han-Yuan Li、Biao Ma、Zhen-Yu Wang、Xing Wang、Hui-Xiong Dai
DOI:10.1021/acs.orglett.1c00296
日期:2021.3.19
Mizoroki–Heck reaction of unstrained arylketone with acrylate/styrene is accomplished via palladium-catalyzed ligand-promoted C–C bond cleavage. Various (hetero)arylketones are compatible in the reaction, affording the alkene product in good to excellent yields. Further applications in the late-stage olefination of some drugs, natural products, and fragrance-derived arylketones demonstrate the synthetic utility
Selective Construction of C−C and C=C Bonds by Manganese Catalyzed Coupling of Alcohols with Phosphorus Ylides
作者:Xin Liu、Thomas Werner
DOI:10.1002/adsc.202001209
日期:2021.2.16
manganese catalyzed coupling of alcohols with phosphorus ylides. The selectivity in the coupling of primary alcohols with phosphorus ylides to form carbon‐carbon single (C−C) and carbon‐carbon double (C=C) bonds can be controlled by the ligands. In the conversion of more challenging secondary alcohols with phosphorus ylides the selectivity towards the formation of C−C vs. C=C bonds can be controlled by the
NHC-catalyzed C–O or C–N bond formation: efficient approaches to α,β-unsaturated esters and amides
作者:Bo Zhang、Peng Feng、Yuxin Cui、Ning Jiao
DOI:10.1039/c2cc32862c
日期:——
Simple and efficient NHC-catalyzed transformations of bromoenal or α,β-dibromoenal into α,β-unsaturated esters or amides with high stereoselectivity through CâO or CâN bond formation have been demonstrated. The NHC-catalyzed processes occur under mild conditions. The ready availability of the starting materials, avoidance of external oxidants and the usefulness of the products all make the strategy attractive.