The Cu-catalyzed aerobic oxidative esterification of simple ketones via C-C bond cleavage has been developed. Varieties of common ketones, even inactive aryl long-chain alkyl ketones, are selectively converted into esters. The reaction tolerates a wide range of alcohols, including primary and secondary alcohols, chiral alcohols with retention of the configuration, electron-deficient phenols, as well
已经开发了通过 CC 键裂解的 Cu 催化的简单酮的有氧氧化酯化。各种常见的酮,甚至是惰性的芳基长链烷基酮,都被选择性地转化为酯。该反应耐受多种醇,包括伯醇和仲醇、保留构型的手性醇、缺电子酚以及各种天然醇。使用廉价的铜催化剂、广泛的基材范围以及中性和露天条件使该协议非常实用。(18)O 标记实验表明,在这种转化过程中发生了氧化作用。初步机制研究表明,该过程主要涉及两条新途径。
Fe-Catalyzed Aerobic Oxidative C–CN Bond Cleavage of Arylacetonitriles Leading to Various Esters
作者:Weiguang Kong、Bingnan Li、Xuezhao Xu、Qiuling Song
DOI:10.1021/acs.joc.6b01594
日期:2016.9.16
Fe-catalyzed aerobic oxidative esterifications of arylacetonitriles with alcohols, tri alkoxsilanes, silicate esters, or borate esters have been developed. The acyl groups which were in situ generated via chemoselective C(CO)-CN bond cleavage were directly used as electrophiles, leading to corresponding aryl esters in good to excellent yields under molecular oxygen when attacked by alcohols or alcohol
Snipping tool: Zn(OTf)2 is an efficient catalyst for selective cleavage of amides bearing a β‐hydroxyethyl group on the nitrogen atom. The mechanism involves an N,O‐acyl rearrangement and transesterification. This new catalytic system can be applied to sequence‐specific peptide bond scission at the amine side of a serine residue. Tf=trifluoromethanesulfonyl.
Development of new palladium catalysts for the alkoxycarbonylation of aryl chlorides
作者:Wolfgang Mägerlein、Adriano F Indolese、Matthias Beller
DOI:10.1016/s0022-328x(01)01293-1
日期:2002.1
The alkoxycarbonylation of different aryl chlorides was studied. Studies of the butoxycarbonylation of 4-chlorobenzotrifluoride and chlorobenzene using chelating ferrocenylphosphines reveal the advantages of these ligands compared to the wen-known tricyclohexylphosphine (PCy3). (1-(2-(Dicyclohexylphosphino)ferroceuyl)ethyldicyclohexylphosphine (4) was shown to give the most active palladium catalyst system. The usefulness of this catalyst is demonstrated in the alkoxycarbonylation of various aryl chlorides. Optimized carbonylation conditions were realized by a statistical design of three critical reaction parameters. (C) 2002 Elsevier Science B.V. All rights reserved.