Synthesis and antiinflammatory activity of novel 2,5-disubstituted thiophene derivatives
作者:SAHAR BADR
DOI:10.3906/kim-1001-473
日期:——
New series of 2,5-disubstituted thiophenes were synthesized. Thiosemicarbazones 1a-b were reacted with various reagents, such as diethyl-2-bromomalonate, ethyl-2-chloroacetoacetate, thioglycolic acid, 4-substituted phenacyl bromides, and acetic anhydride, to afford heterocyclic substituted thiophene derivatives 2a-b, 3a-b, 4a-b, 5a-b, 6a-b, and 7a-b, respectively. Moreover, cyclization of the key intermediate 1b with chloroacetic acid yielded thiazolidine 9, which on reaction with appropriate aromatic aldehydes afforded the corresponding arylidene derivatives 10a-f. Finally, reaction of N^\-arylidene cyanoacetohydrazide 11 with sulfur and phenylisothiocyanate yielded thiazoline derivative 12, which on treatment with triethylorthoformate and acetic anhydride afforded thiazolo[4,5-d]pyrimidinone derivative 13. Some of the newly synthesized compounds showed promising antiinflammatory activity.
合成了一系列2,5-二取代噻吩的新化合物。与不同试剂反应的硫脲胺1a-b,包括二乙基-2-溴丙二酸酯、乙基-2-氯乙酰乙酸酯、硫代甘氨酸、4-取代苯乙基溴和醋酸酐,分别生成了杂环取代的噻吩衍生物2a-b、3a-b、4a-b、5a-b、6a-b和7a-b。此外,关键中间体1b与氯乙酸的环化反应生成了噻唑烷酮9,后者与适当的芳香醛反应生成相应的芳基亚烯丙基衍生物10a-f。最后,N-芳基亚烯丙基氰基化脲11与硫和苯异硫氰酸酯反应生成噻唑啉衍生物12,随后与三乙基正腺酸酯和醋酸酐处理后得到噻唑[4,5-d]嘧啶酮衍生物13。一些新合成的化合物显示出良好的抗炎活性。