Catalytic coupling of N-benzylic sulfonamides with silylated nucleophiles at room temperature
作者:Bai-Ling Yang、Shi-Kai Tian
DOI:10.1039/c0cc00765j
日期:——
In the presence of 2-10 mol% of Tf(2)NH, a range of N-benzylic sulfonamides smoothly react with allylic, propargylic, benzylic, or hydrido silanes at room temperature via sp(3) carbon-nitrogen bond cleavage to afford structurally diverse products in moderate to excellent yields and with high chemo- and regioselectivity.
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。
Rhodium(II)-Catalyzed CH Insertions with {[(4-Nitrophenyl)sulfonyl]imino}phenyl-λ<sup>3</sup>-iodane
in formal insertions into CHbonds, activated by phenyl or vinyl groups, or by O-substituents. Scope and limitations of the reaction were investigated. Yields of up to 84% were achieved in the most favorable cases. Yields were enhanced by electron-releasing substituents and decreased by steric hindrance. Aziridination competed with allylic insertion with olefinic substrates. The insertion reaction proceeded
Au(iii)-catalyzed intermolecular amidation of benzylic C–H bonds
作者:Yan Zhang、Bainian Feng、Chengjian Zhu
DOI:10.1039/c2ob26857d
日期:——
Au(III)-catalyzed intermolecular amidations of benzylic C–H bonds with sulfonamides and carboxamides are described. The protocol with the Au–bipy complex/N-bromosuccinimide system provides practical applications for synthesis of various amides via C–H activations. The reaction proceeds with high efficiency to give the corresponding amines, which are extremely useful synthetic intermediates.