Synthesis of Functionalized Fused-Ring Heterocycles from Tautomers of 2-(Thiazole, Oxazole, Benzothiazole, and Benzoxazole)-1-phenylethenols and 1,3-Diacid Chlorides or N-(Chlorocarbonyl) Isocyanate
作者:Hondamuni De Silva、Charles Pittman、Sabornie Chatterjee、William Henry
DOI:10.1055/s-0032-1316800
日期:——
2-a]pyridin-5(6H)-one, was formed in the reaction of the tautomers of (Z)-1-phenyl-2-(thiazol-2-yl)ethenol with cyclobutane-1,1-dicarbonyl dichloride via a ring expansion after 5,6-ring fusion. Functionalized 5,6-ring-fused 8-benzoyl-6H-thiazolo- and 8-benzoyl-6H-oxazolo[3,2-f]pyrimidine-5,7-diones, and 4-benzoyl-1H-benzo[4,5]thiazolo- and 4-benzoyl-1H-benzo[4,5]oxazolo[3,2-c]pyrimidine-1,3(2H)-diones were
摘要 将2-甲基噻唑,2,4,5-三甲基噻唑,2,4,5-三甲基恶唑,2-甲基苯并噻唑和2-甲基苯并恶唑分别与苯甲酰氯在乙腈-三乙胺中反应生成(Z)-2-(杂环)- 1-苯基乙烯基苯甲酸酯。这些乙烯基苯甲酸酯的碱水解形成了(Z)-2-(杂环)-1-苯基乙烯醇,它们以酮和烯醇互变异构形式存在。这些互变异构体用作稠合环杂环合成的原料。在乙腈-三乙胺中与2,2-二烷基-1,3-二酰氯反应,得到相应的5,6-环稠合的8-苯甲酰基-6,6-二烷基-6 H-噻唑基-,8-苯甲酰基-2, 3,6,6-四甲基-6 H-噻唑-,8-苯甲酰基-2,3,6,6-四甲基-6 H-恶唑-,4-苯甲酰基-2,2-二甲基-1 H-苯并[4,5]噻唑洛-和4-苯甲酰基-2,2-二甲基-1 H-苯并[4,5]恶唑[3, 2, -一个]吡啶二酮衍生物。5,6,6-三环稠合的物质10-苯甲酰基-7,8-二氢吡喃并[2,3- d