Iridium(III)-Catalyzed Intermolecular Allylic C–H Amidation of Internal Alkenes with Sulfonamides
作者:Pinki Sihag、Masilamani Jeganmohan
DOI:10.1021/acs.joc.9b02047
日期:2019.10.18
aryl-alkyl alkenes, the amidation selectively takes place at the alkyl-substituted allylic carbon. Meanwhile, the better selectivity was also observed in the unsymmetrical aryl-aryl alkenes having an electron-withdrawing substituent at one of the aryl groups. A possible reaction mechanism involving a π-allyl iridium intermediate was proposed and supported by the deuterium labeling studies. The deuterium labeling
Regioselective Intermolecular Allylic C−H Amination of Disubstituted Olefins via Rhodium/π-Allyl Intermediates
作者:Jacob S. Burman、Simon B. Blakey
DOI:10.1002/anie.201707021
日期:2017.10.23
A method for catalytic intermolecularallylic C−H amination of trans‐disubstituted olefins is reported. The reaction is efficient for a range of common nitrogen nucleophiles bearing one electron‐withdrawing group, and proceeds under mild reaction conditions. Good levels of regioselectivity are observed for a wide range of electronically diverse trans‐β‐alkyl styrene substrates.
Sulfonic Acid-Functionalized Ionic Liquids as Metal-Free, Efficient and Reusable Catalysts for Direct Amination of Alcohols
作者:Feng Han、Lei Yang、Zhen Li、Chungu Xia
DOI:10.1002/adsc.201100886
日期:2012.4.16
the direct amination of alcohols. Notably, the activities of the series of SO3H‐functionalized ionic liquids were compared and a 92% isolated yield was obtained using 3‐tetradecyl‐1‐(butyl‐4‐ sulfonyl)imidazolium trifluoromethanesulfonate ([BsTdIM][OTf]) as the catalyst. Importantly, the catalytic system has wide substrate scope including benzylic, allyl, propargylic, aliphatic alcohols with sulfonamide
合成了一系列磺酸官能化(SO 3 H官能化)的离子液体,并将其用作无金属,高选择性和高效的催化剂,用于醇的直接胺化。值得注意的是,SO 3系列的活动比较了H-官能化的离子液体,并使用3-十四烷基-1-(丁基-4-磺酰基)咪唑三氟甲磺酸盐([BsTdIM] [OTf])作为催化剂,可分离出92%的产率。重要的是,催化体系具有广泛的底物范围,包括苄基,烯丙基,炔丙基,带有磺酰胺的脂族醇,酰胺,氨基甲酸酯,芳族胺和N杂环化合物。有趣的是,该系统还适用于几克规模的酒精直接胺化。此外,[BsTdIM] [OTf]的可重用性质使该协议更具吸引力,并且避免了酸性催化剂的处理和中和。此外,初步实验表明该反应应通过S N 1途径进行。
Gold versus silver-catalyzed amination of allylic alcohols
作者:Xavier Giner、Paz Trillo、Carmen Nájera
DOI:10.1016/j.jorganchem.2010.09.072
日期:2011.1
Direct substitution of the hydroxy group in allylicalcohols by different nitrogenated nucleophiles is performed using low loadings of cationic gold(I) or silver salts as catalysts. Sulfonamides, carbamates and aromatic amines can be used as nucleophiles. Comparative studies between the best catalysts, cationic (triphenylphosphite)gold(I) complex and silver triflate, demonstrate that the former catalyst