On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate
作者:Rakesh K. Saunthwal、Monika Patel、Rakesh K. Tiwari、Keykavous Parang、Akhilesh K. Verma
DOI:10.1039/c4gc02154a
日期:——
A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highlyfunctionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate 1 with isothiocyanates 2 using water as an environmental friendly solvent is described.
A novel and efficient method has been developed for the synthesis of a series of 3,4‐dihydroquinazoline‐2(1H)‐thione derivatives in aqueousorganicsolvent starting from 3‐(2‐aminophenyl)acrylates with isothiocyanates via a tandem intermolecular nucleophilic addition/intramolecular Michael addition reaction under mild conditions. A broad substrate scope has been demonstrated, which shows wide functional
New simple synthesis of ring-fused 4-alkyl-4<i>H</i>-3,1-benzothiazine-2-thiones: Direct formation from carbon disulfide and (<i>E</i>)-3-(2-aminoaryl)acrylates or (<i>E</i>)-3-(2-aminoaryl)acrylonitriles
A new simple and efficient method to construct ring-fused 4-alkyl-4H-3,1-benzothiazine-2-thione derivatives has been developed from carbondisulfide and (E)-3-(2-aminoaryl)acrylates or (E)-3-(2-aminoaryl)acrylonitriles under mild conditions, without the need for a metal catalyst. The newly developed method tolerates a wide range of substrates in moderate to excellent yields. Moreover, this method is