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
2-叠氮羰基-3-氯苯并[b]噻吩3由3-氯-苯并[b]噻吩-2-羰基氯1和3-氯-苯并[b]噻吩-2-羧基酰肼2得到。化合物 3 与各种醇、胺和肼进行 Curtius 重排,分别得到相应的氨基甲酸酯 4a-b、脲 5a-j 和氨基脲 6a-g。通过用各种查耳酮处理,化合物 2 还用于合成吡唑 7a-c。新合成的化合物的结构基于红外、 1 H 核磁共振和质谱数据进行了阐明,并已筛选出抗菌和镇痛活性。