Cycloaddition Reactions of 2-Hydroxy-, 2-Amino-, and 2-Mercapto-1-azaazulenes with Reactive Acetylenes
作者:Noritaka Abe、Toshiyuki Takehiro
DOI:10.1246/bcsj.61.1225
日期:1988.4
The reaction of 1-methyl-1-azaazulen-2(1H)-one (1a) with dimethyl acetylenedicarboxylate (DMAD) or dibenzoylacetylene (DBA) in refluxing acetonitrile gave 1,2-disubstituted azulene (2), 2-methylcyclopent[de]isoquinolin-3(2H)-ones, 1-methyl-1-azacyclopent[cd]azulen-2(1H)-ones, and 3-substituted 1-methyl-1-azaazulen-2(1H)-ones, whereas in refluxing t-butylbenzene, compound 2 and 6,8-etheno-1-methylcyclohepta[b]pyrrol-2(1H)-one were obtained as major products. The reactions proceeded periselectively depending on the temperature. 2-Hydroxy-1-azaazulene behaved as 1-azaazulen-2(1H)-one and the reaction with DMAD gave similar result as for 1a. The reaction of 2-amino-1-azaazulene with DMAD gave methyl 2,4a-dihydro-2-oxo-1,4a-diazabenz[a]azulene-4-carboxylate and tetramethyl 4,5-dihydro-1H-1,11-diazacyclohept[a]azulene-2,3,4,5-tetracarboxylate. The reaction of 2-mercapto-1-azaazulene with DMAD gave tetramethyl 4,4a-dihydro-4a-azabenz[a]azulene-1,2,3,4-tetracarboxylate in moderate yield. The reaction mechanisms of these reactions are discussed.
在回流乙腈中,1-甲基-1-氮杂薁-2(1H)-酮(1a)与乙炔二甲酸二甲酯(DMAD)或二苯甲酰基乙炔(DBA)反应,生成 1,2-二取代氮杂薁(2)、2-甲基环戊并[de]异喹啉-3(2H)-酮、1-甲基-1-氮杂环戊并[cd]氮杂薁-2(1H)-酮和 3-取代 1-甲基-1-氮杂薁-2(1H)-酮、而在回流的 t-丁基苯中,得到的主要产物是化合物 2 和 6,8-乙烯基-1-甲基环庚并[b]吡咯-2(1H)-酮。反应进行的全选择性取决于温度。2- 羟基-1-氮杂吲哚表现为 1-氮杂吲哚-2(1H)-酮,与 DMAD 反应的结果与 1a 相似。2-amino-1-azaazulene 与 DMAD 反应生成 2,4a-二氢-2-氧代-1,4a-二氮杂苯并[a]氮杂烯-4-羧酸甲酯和 4,5-二氢-1H-1,11-二氮杂环庚[a]氮杂烯-2,3,4,5-四羧酸四甲酯。2-mercapto-1-azaazulene 与 DMAD 反应产生了 4,4a-二氢-4a-氮杂苯并[a]氮杂环戊烯-1,2,3,4-四羧酸四甲酯,收率中等。本文讨论了这些反应的反应机理。