Synthesis of new 2-substituted 3-amino-4-hydroxymethylthiophenes through intramolecular nitrile oxide cycloaddition processes and N,O-bond cleavage
作者:Venerando Pistarà、Antonino Corsaro、Maria A. Chiacchio、Graziella Greco、Paolo Quadrelli
DOI:10.3998/ark.5550190.0012.618
日期:——
A synthesis of new 2-substituted 3-amino-4-hydroxymethylthiophenes 7 is reported as a useful alternative to the long known oximation of oxothiophenes 8, followed by treatment with gaseous hydrochloric acid in a polar solvent. The synthesis consists of an INOC process of unsaturated sulfide nitrile oxides, obtained from the condensation of corresponding nitroalkenes and allylmercaptan and then dehydration
据报道,合成新的 2-取代 3-氨基-4-羟甲基噻吩 7 是长期以来已知的氧代噻吩 8 肟化的有用替代品,然后在极性溶剂中用气态盐酸处理。该合成包括不饱和硫化物腈氧化物的 INOC 过程,由相应的硝基烯烃和烯丙硫醇缩合获得,然后脱水,导致四氢噻吩并 (3,4-c) 异恶唑啉 4. 氢化物后 4 的 N,O-键裂解还原提供了具有生物学意义的噻吩 7。