Aerobic oxidative coupling of alcohols and amines towards imine formation by a dicopper(I,I) catalyst
作者:Indranil Dutta、Subhabrata De、Sudhir Yadav、Ranajit Mondol、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2017.05.009
日期:2017.11
A dicopper(I,I) complex [Cu2(L1) (Cl)2] (1), bearing a Cu2Cl2 core spanned by a naphthyridine–diimine ligand is synthesized by the treatment of CuCl with 2,7–bis(N–mesitylmethylimino)–1,8–naphthyridine (L1). The catalytic efficacy of 1 is assessed for aerobic oxidative synthesis of imines from alcohols and amines. The title complex is found to be an excellent catalyst for a wide variety of alcohols
Selective CS bond cleavage of a β-sultam ring was achieved by the reactions with Lewis acids. Aryl ketones or aldehyde were provided from 3-aryl-β-sultams whereas β-sultams bearing a poorly migratory substituent at C-3 gave trans-1,2,3-oxathiazolidine 2-oxides and/or cis-aziridines. These reactions were influenced by the cation-stabilizing capability of C-4 substituents and by the configuration of
3‐(o‐Carboxyphenyl)propionic acid and four of its heteroatom‐containing analogs, as well as benzene‐ring‐fused analogs, have been shown to undergo a Castagnoli–Cushman reaction when dehydrated in the presence of an imine using aceticanhydride. This provides a facile, diastereoselective route to skeletally diverse arene‐fused ε‐lactams.
Cobalt-Catalyzed Acceptorless Alcohol Dehydrogenation: Synthesis of Imines from Alcohols and Amines
作者:Guoqi Zhang、Susan K. Hanson
DOI:10.1021/ol303479f
日期:2013.2.1
A cobalt catalyst has been developed for the acceptorlessdehydrogenation of alcohols and applied to synthesize imines from alcohols and amines. Deuterium labeling studies suggest that the reaction proceeds by an initial reversible alcoholdehydrogenation step involving a cobalt hydride intermediate.
Mixed carboxylic–sulfonic anhydride in reaction with imines: a straightforward route to water-soluble β-lactams <i>via</i> a Staudinger-type reaction
作者:Olga Bakulina、Dmitry Dar'in、Mikhail Krasavin
DOI:10.1039/c8ob00768c
日期:——
carboxylic–sulfonic anhydride in reaction with imines is reported. Unlike its well-studied isostere homophthalic anhydride, benzo[c][1,2]oxathiin-3(4H)-one 1,1-dioxide gave no product of a formal [4 + 2] cycloaddition and only followed an alternative reaction pathway toward β-lactams, presumably, via a formal [2 + 2] cycloaddition (a Staudinger-type reaction). Optimized reaction conditions involve the use
据报道,第一个使用混合的羧酸-磺酸酐与亚胺反应的例子。与苯丙[ c ] [1,2]恶臭素-3(4 H)-1,1,1-二氧化物不同,它的研究方法广为人知,它没有形成正式的[4 + 2]环加成反应的产物,并且仅在可替代的反应后进行可能通过正式的[2 + 2]环加成反应(Staudinger型反应)通向β-内酰胺的途径。优化的反应条件包括使用三乙胺作为碱助催化剂,这还允许通过常规柱色谱法分离相应的三乙铵盐形式的产物β-内酰胺苯磺酸。反应显示出对反式有一些偏爱-异构体形成;在某些情况下,可以分离出纯的非对映异构体。