Reactions of 2-amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene and 2-amino-3-cyano-4,7-diphenyl-5-methyl-4H-pyrano[2,3-c] pyrazole with phenylisocyanate, carbon disulfide, and thiourea
作者:Ahmed S. A. Youssef、Kamal A. Kandeel、Fouli A. Fouli、Wael S. I. Abou-Elmagd
DOI:10.1002/hc.20070
日期:——
2-Amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene 1a or 2-amino-3-cyano-4,7-di- phenyl-5-methyl-4H-pyrano[2,3-c]pyrazole 2a reacted with phenylisocyanate in dry pyridine to give 2-(3-phenylureido)-3-cyanobenzo[b]thiophene 1b or 2-disubstituted amino-3-cyanopyranopyrazole 2b derivative. However, when 1a and 2a were refluxed with carbondisulfide in 10% ethanolic sodium hydroxide solution, they afforded