Synthesis of Benzo[b]thiophene Substituted Carbamates, Ureas, Semicarbazides, and Pyrazoles and Their Antimicrobial and Analgesic Activity
作者:Tholappanavara H. Suresha Kumara、Kittappa M. Mahadevan、Hosanagara N. Harishkumar、Basavaraj Padmashali、Gadada Naganagowda
DOI:10.1080/10426500802388433
日期:2009.7.13
2-Azidocarbonyl-3-chlorobenzo[b]thiophene 3 was obtained from 3-chloro-benzo[b]thiophene-2-carbonyl chloride 1 and 3-chloro-benzo[b]thiophene-2-carboxy hydrazide 2 . The compound 3 on Curtius rearrangement with various alcohols, amines, and hydrazines afforded the corresponding carbamates 4a–b , ureas 5a–j , and semicarbazides 6a–g , respectively. Compound 2 was also utilized for the synthesis of pyrazoles