nickel-catalyzed cross-electrophile coupling of benzyl alcohols with aromatic bromides has been developed. This deoxygenative cross-coupling occurs under mild reaction conditions at ambient temperature affording diarylmethanes, or 1,3-diarylpropenes from benzyl allyl alcohols. The system demonstrated good chemoselectivity tolerating an assortment of reactive functional groups.
作者:Stefania F. Musolino、O. Stephen Ojo、Nicholas J. Westwood、James E. Taylor、Andrew D. Smith
DOI:10.1002/chem.201604788
日期:2016.12.23
The non‐enzymatic acylative kineticresolution of challenging aryl–alkenyl (sp2 vs. sp2) substituted secondaryalcohols is described, with effective enantiodiscrimination achieved using the isothiourea organocatalyst HyperBTM (1 mol %) and isobutyric anhydride. The kineticresolution of a wide range of aryl–alkenyl substituted alcohols has been evaluated, with either electron‐rich or naphthyl aryl
描述了具有挑战性的芳基-烯基(sp 2与 sp 2 )取代的仲醇的非酶酰化动力学拆分,并使用异硫脲有机催化剂 HyperBTM(1 mol%)和异丁酸酐实现了有效的对映区分。已经评估了各种芳基-烯基取代醇的动力学拆分,其中富电子或萘基芳基取代基与未取代的乙烯基取代基相结合,提供了最高的选择性( S =2-1980)。演示了使用该方案对模型芳基-乙烯基(sp 2与 sp 2 )取代的仲醇进行克级(2.5 g)动力学拆分,可获取每种产物对映体的 >1 g 99:1呃。
A Concise Copper-Catalyzed Oxytrifluoromethylation of Allyl Alcohols
An efficient oxytrifluoromethylation of 1-aryl-substituted allylalcohols has been developed using Togni’s reagent II as a trifluoromethylation reagent and copper(I) chloride as a catalyst. This reaction proceeded through a one-pot process of trifluoromethylation followed by nucleophilic attack of the vicinal hydroxyl group. This strategy features good diastereoselectivity and broad substrate scope
已使用 Togni 试剂 II 作为三氟甲基化试剂和氯化铜 (I) 作为催化剂开发了 1-芳基取代的烯丙醇的有效氧三氟甲基化。该反应通过三氟甲基化的一锅法进行,然后是邻羟基的亲核攻击。该策略具有良好的非对映选择性和广泛的底物范围,可以轻松获得各种 2-芳基-3-(2,2,2-三氟乙基)环氧乙烷。
Iridium-Catalyzed C-3 Allylation of Indoles with Allylic Alcohols Promoted by a Brønsted Acid
作者:Chun Cai、Shu-jie Chen、Guo-ping Lu
DOI:10.1055/s-0033-1341156
日期:——
A highly regioselective method has been developed for the allylation of indoles with an iridium catalyst. This regioselective procedure uses allylic alcohols directly as allylating agents in the presence of a catalytic amount of sulfuric acid. A wide range of indoles reacted smoothly with asymmetrical allylic alcohols to give the corresponding branched products in branched-to-linear ratios of up to 99: 1 and yields as high as 92%. A series of inorganic and organic acids were tested in this approach, and it was shown that acids with pK(a) values in acetonitrile of less than 15 are required in this iridium-catalyzed system.