The Preparation of 3-Phenyl[1,2,4]triazolo[4,3-<i>a</i>]pyridines and Their Benzologs from<i>N</i>-(Phenylsulfonyl)benzohydrazonoyl Chloride and Pyridines
作者:Suketaka Ito、Akikazu Kakehi、Toshiyuki Matsuno、Jun-ichi Yoshida
DOI:10.1246/bcsj.53.2007
日期:1980.7
3-Phenyl[1,2,4]triazolo[4,3-a]pyridines were obtained in good yields from N′-[α-(1-pyridinio)benzylidene]benzenesulfonohydrazidates, generated from 2-unsubstituted pyridines and N-(phenylsulfonyl)benzohydrazonoyl chloride (2), by oxidation with chloranil. The reaction of quinoline and isoquinoline with 2 gave 1-phenyl-3-phenylsulfonyl-3,3a-dihydro[1,2,4] triazolo [4,3-a]quinoline and 3-phenyl-1-phenylsulfonyl-1
3-苯基[1,2,4]三唑并[4,3-a]吡啶以良好的收率从N'-[α-(1-吡啶基)苄叉]苯磺酰肼中获得,由2-未取代的吡啶和N-(苯磺酰基)苯并腙酰氯(2),用氯苯醌氧化。喹啉和异喹啉与 2 反应得到 1-苯基-3-苯基磺酰基-3,3a-二氢[1,2,4]三唑并[4,3-a]喹啉和3-苯基-1-苯基磺酰基-1,10b -二氢[1,2,4]三唑并[3,4-a]异喹啉,均产率良好;它们在加热时通过苯亚磺酸的 1,2-消除芳构化为相应的三唑。