A Stoichiometric Haloform Coupling for Ester Synthesis with Secondary Alcohols
作者:Albert C. Rowett、Stephen G. Sweeting、David M. Heard、Alastair J. J. Lennox
DOI:10.1002/anie.202400570
日期:——
A general haloform coupling reaction for the synthesis of esters from methyl ketones is reported using one equivalent of alcohol. Detailed kinetic modelling studies demonstrate that the key intermediates are formed under equilibrium, which led to the development of conditions that are amenable to secondary alcohols. TOC image: Georges Simon Serullas. Halftone after lithograph by Palley. Wellcome Collection
据报道,用于从甲基酮合成酯的一般卤仿偶联反应使用一种当量的醇。详细的动力学建模研究表明,关键中间体是在平衡下形成的,这导致了适合仲醇的条件的发展。TOC 图片:Georges Simon Serullas。Palley 石版画后的半色调。惠康收藏,公共领域标志。资料来源:Wellcome Collection。
Palladium-Catalyzed Substitution and Cross-Coupling of Benzylic Fluorides
作者:George Blessley、Patrick Holden、Matthew Walker、John M. Brown、Véronique Gouverneur
DOI:10.1021/ol300977f
日期:2012.6.1
Benzylic fluorides are suitable substrates for Pd(0)-catalyzed Tsuji–Trost substitution using carbon, nitrogen, oxygen, and sulfur nucleophiles and for cross-coupling with phenylboronic acid. For the bifunctionalsubstrate 4-chlorobenzyl fluoride, fine-tuning of the reaction conditions allows for the regioselective displacement of either the chlorine or fluorine substituent. The leaving group ability
苯甲酸氟化物是使用碳,氮,氧和硫亲核试剂进行Pd(0)催化的Tsuji-Trost取代以及与苯基硼酸交叉偶联的合适底物。对于双官能底物4-氯苄基氟化物,反应条件的微调允许氯或氟取代基的区域选择性置换。的氟化物VS在替代移位其它基团的离去基团的能力是CF 3 CO 2 ≈ p -NO 2 ç 6 ħ 4 CO 2 ≈OCO 2 CH 3 >˚F> CH 3 CO 2,其排名与Pd催化下的烯丙基氟化物相似。