使用电子供体从相应的芳基卤化物生成芳基自由基,然后与芳烃进行分子内环化,可能是当代联芳基合成的重要进步。本文报道了一种绿色且实用的合成方案,用于获取各种六元和七元联芳基磺胺类化合物,尤其是具有游离 NH 基团的化合物,包括克级合成的演示。次硫酸根阴离子自由基 (SO 2 –• ),由试剂雕白粉或连二亚硫酸钠 (Na 2 S 2 O 4),被发现是从芳基卤化物形成芳基自由基的关键单电子转移剂,其在分子内芳基化后得到具有良好至优异产率的联芳基磺胺。该方法的特点是产生仍未开发的芳基自由基,使用廉价且易于获得的工业试剂,以及无过渡金属、温和和绿色的反应条件。
In situ Generation and Utilization of CO: An Efficient Route
towards N-Substituted Saccharin via Carbonylative Cyclization of 2-Iodosulfonamides
作者:Bhalchandra Bhanage、Sujit Chavan、Adithyaraj K.
DOI:10.1055/s-0036-1588422
日期:2017.9
The present protocol demonstrates the synthesis of N-substituted saccharines via carbonylative cyclization of 2-iodosulfonamides using a Pd(OAc) 2 /Xantphos catalyst system and phenylformate as a CO source. A variety of saccharin derivatives is synthesized under milder reaction conditions.
本协议演示了使用 Pd(OAc) 2 /Xantphos 催化剂系统和苯甲酸作为 CO 源通过 2-碘磺酰胺的羰基化环化合成 N 取代的糖精。多种糖精衍生物是在较温和的反应条件下合成的。
One-Pot Consecutive Sulfonamidation/<i>ipso</i>-Cyclization Strategy for the Construction of Azaspirocyclohexadienones
Harnessing of Morita–Baylis–Hillman (MBH) carbonates of acetylenic aldehydes as handy synthons has allowed a facile synthesis of azaspirocyclohexadienones by sequential DABCO-promoted sulfonamidation/ICl-mediated ipso-iodocyclization reactions. A variety of MBH-carbonates having aryl or heteroaryl groups on the alkyne functionality fruitfully participated in the one-pot ipso-annulation reaction to provide the
A direct approach to 2-(aminomethyl)indoles by copper-catalyzed domino three-component coupling−cyclization of 2-ethynylanilines with a secondary amine and aldehyde has been developed. By use of a cyclic or acyclic secondary amine and aldehyde (paraformaldehyde, aliphatic or aromatic aldehydes) in the presence of 1 mol % of CuBr, 2-ethynylanilines were converted to a variety of substituted 2-(aminomethyl)indoles
通过铜催化的2-乙炔基苯胺与仲胺和醛的多米诺三组分偶联-环化反应,已开发出直接方法用于2-(氨基甲基)吲哚。通过在1摩尔%的CuBr存在下使用环状或无环仲胺和醛(低聚甲醛,脂肪族或芳香族醛),将2-乙炔基苯胺以良好的收率转化为各种取代的2-(氨基甲基)吲哚。利用该多米诺反应和吲哚C-3位的CH官能化,可以轻松合成多环吲哚。还介绍了通过磺酰胺和丙二酸酯同类物的反应来构建苯并[ e ] [1,2]噻嗪和茚基图案。
Palladium-Catalyzed CC Coupling of Aryl Halides with Isocyanides: An Alternative Method for the Stereoselective Synthesis of (3E)-(Imino)isoindolin-1-ones and (3E)-(Imino)thiaisoindoline 1,1-Dioxides
transformation successfully extends itsapplication for the synthesis of phenanthridines and dibenzooxazepines. This new synthetic protocol not only extends the application platform for palladium-catalyzed CC coupling of aryl halides with isocyanides, but also opens atom-economic and step-economic synthetic routes for nitrogen-containing heterocyclic compounds with wide functional group compatibility.
Copper-Catalyzed Domino Synthesis of Nitrogen Heterocycle-Fused Benzoimidazole and 1,2,4-Benzothiadiazine 1,1-Dioxide Derivatives
作者:Daoshan Yang、Baojuan An、Wei Wei、Laijin Tian、Ben Huang、Hua Wang
DOI:10.1021/co500125n
日期:2015.2.9
A convenient copper-catalyzeddomino method for the synthesis of nitrogen heterocycle-fused benzoimidazole and 1,2,4-benzothiadiazine 1,1-dioxides has been developed using readily available 2-bromo-N-phenylbenzenesulfonamides and benzimidazole derivatives as the starting materials. The domino process comprises an Ullmann-type N-arylation and intramolecular C–H amination. The inexpensive and efficient