Palladium-Catalyzed Enantioselective Intermolecular Coupling of Phenols and Allylic Alcohols
作者:Nicholas J. Race、Cristiane S. Schwalm、Takayuki Nakamuro、Matthew S. Sigman
DOI:10.1021/jacs.6b11486
日期:2016.12.14
An enantioselective intermolecular coupling of oxygen nucleophiles and allylic alcohols to give β-aryloxycarbonyl compounds is disclosed using a chiral pyridine oxazoline-ligated palladium catalyst under mild conditions. As opposed to the formation of traditional Wacker-type products, enantioselective migratory insertion is followed by β-hydride elimination toward the adjacent alcohol. Deuterium labeling
Highly Enantioselective Synthesis of 1,2,3-Substituted Cyclopropanes by Using α-Iodo- and α-Chloromethylzinc Carbenoids
作者:Louis-Philippe B. Beaulieu、Lucie E. Zimmer、Alexandre Gagnon、André B. Charette
DOI:10.1002/chem.201202528
日期:2012.11.12
α‐chlorozinc carbenoids by using a dioxaborolane‐derived chiral ligand. The synthetically useful iodocyclopropane building blocks were derivatized by an electrophilic trapping of the corresponding cyclopropyl lithium species or a Negishi coupling to give access to a variety of enantioenriched 1,2,3‐substituted cyclopropanes. The synthetic utility of this method was demonstrated by the formal synthesis of an
Enantioselective Synthesis of 1,2,3-Trisubstituted Cyclopropanes Using <i>gem</i>-Dizinc Reagents
作者:Lucie E. Zimmer、André B. Charette
DOI:10.1021/ja906033g
日期:2009.11.4
The first asymmetric cyclopropanation of allylicalcoholsusing gem-dizinc carbenoids, which allows the synthesis of 1,2,3-substituted cyclopropane derivatives in high yields and excellent enantio- and diastereoselectivities, is reported. The initially formed cyclopropylzinc undergoes an in situ B/Zn exchange with the stoichiometric chiral ligand to generate a cyclopropyl borinate that can be directly
Catalytic S<sub>N</sub>2′-Selective Substitution of Allylic Chlorides With Arylboronic Esters
作者:Aaron M. Whittaker、Richard P. Rucker、Gojko Lalic
DOI:10.1021/ol101171v
日期:2010.7.16
A copper-catalyzed SN2′-selective arylation of allylicchlorides has been achieved using arylboronic esters as nucleophiles. Arylation products were obtained in high yield with a variety of allylicchlorides and arylboronic esters in the presence of a wide range of functional groups. A mechanism is proposed on the basis of the results of stoichiometric experiments and the isolation of the proposed
使用芳基硼酸酯作为亲核试剂,已经实现了铜催化的烯丙基氯化物的S N 2'选择性芳基化。在各种官能团存在的情况下,可以使用多种烯丙基氯化物和芳基硼酸酯以高收率获得丙烯酸化产物。根据化学计量的实验结果和所提出的中间体的分离,提出了一种机理。