A series of bibenzo[b][1,4]thiazines with various functional groups has been synthesized by a free-radical condensation reaction. Bibenzo[b][1,4]thiazines were obtained in moderate to good yield (up to 85%) through a one-step reaction of readily available 2,2′-dithiodianiline and methyl aryl ketones with AIBN as radical initiator in HOAc. Bibenzo[b][1,4]thiazines exhibit diversiform solid-state packing
通过自由基缩合反应合成了一系列具有各种官能团的联苯并[ b ] [1,4]噻嗪。在HOAc中,通过容易获得的2,2'-二硫代二苯胺和甲基芳基酮与AIBN作为自由基引发剂的一步反应,以中等至良好的收率(高达85%)获得联苯并[ b ] [1,4]噻嗪。联苯并[ b ] [1,4]噻嗪表现出多种形式的固态堆积。
Efficient 2-Aryl Benzothiazole Formation from Aryl Ketones and 2-Aminobenzenethiols under Metal-Free Conditions
作者:Yunfeng Liao、Hongrui Qi、Shanping Chen、Pengcheng Jiang、Wang Zhou、Guo-Jun Deng
DOI:10.1021/ol302902e
日期:2012.12.7
2-Aryl benzothiazole formationfrom aryl ketones and 2-aminobenzenethiols under metal- and I2-free conditions was described. Various 2-aryl benzothiazoles were selectively obtained in good yields using molecular oxygen as oxidant. DMSO played an important role in this transformation. Functional groups such as methyl, methoxy, fluoro, chloro, bromo and nitro groups were tolerated under the optimized reaction
Ni(<scp>ii</scp>)-catalyzed oxidative deamination of benzyl amines with water
作者:Nilay Kumar Pal、Kuldeep Singh、Moumita Patra、Suman Yadav、Prabhakar K. Pandey、Jitendra K. Bera
DOI:10.1039/d3gc00672g
日期:——
Oxidativedeamination of benzyl amines is achieved using a Ni(II)–NHC catalyst with water in aqueous medium. The product is an aldehyde, wherein water acts as a formal oxidant. Hemilabile pyridyl units embedded in the catalyst allow the approach of amine to the metal and promotes nucleophilic water attack on the metal-bound imine. A water-soluble 3d-metal Ni(II) catalyst bearing promoter ligands opens
使用 Ni( II )-NHC 催化剂和水在水介质中实现苄胺的氧化脱氨。产物是醛,其中水充当形式氧化剂。嵌入催化剂中的半稳定吡啶基单元允许胺接近金属并促进亲核水对金属结合的亚胺的攻击。带有促进剂配体的水溶性3d金属Ni( II )催化剂为水介导的氧化反应开辟了一条新途径。
1,5-Benzoheteroazepines through eco-friendly general condensation reactions
Condensation reactions of o-phenylenediamine and 2 equiv of acetone produce biaryl-substituted 1, 5-benzodiazepines. The synthetic protocol shows general applicability since similar reaction of o-phenylenediamines, o-aminophenol, and o-aminothiophenol with ketones or chalcones leads to formation of functionalized 1,5-benzoheteroazepines in good to excellent yields. The synthetic protocol fulfills many green-chemical requirements using simple MW-assistance to promote the activation of ketones and the eco-compatible Er(III) triflate as activator of chalcones. (C) 2011 Elsevier Ltd. All rights reserved.