摘要/Abstract

烷基异氰酸酯、丁炔二酸二酯(丙炔酸酯)和3-苯甲酰亚甲基-2-吲哚酮在甲苯中回流反应, 高产率地生成螺[环戊烷-1,3'-吲哚啉]衍生物. 然而, 含有游离氨基的3-苯甲酰亚甲基-2-吲哚酮参加反应时, 未取代的氨基可与另一分子丁炔二酸二酯及烷基异氰酸酯继续反应形成含有氨基取代的氮杂-1,3-二烯支链的螺[环戊烷-1,3'-吲哚啉]衍生物. 另一方面, 3-芳亚甲基吲哚-2-酮参与三组分反应时, 仅有游离氨基参与反应, 生成2-(2-氧吲哚-1-基)-3-[(烷基亚氨基)亚甲基]丁酸酯. 发现两种游离氨基参与多组分反应时, 分别形成了含有C2-取代的1-氮杂-1,3-丁二烯(C=C—C=NR)和C4-取代的1-氮杂-1,2-丁二烯(C—C=C=NR)结构单元的吲哚酮衍生物.
关键词: 异氰酸酯, 丁炔二酸二酯, 3-苯甲酰亚甲基吲哚酮, 螺[环戊烷-1,3'-吲哚啉], 多组分反应
The three-component reaction of alkylisocyanide, dialkyl acetylenedicarboxylate (alkyl propiolate) and 3-phenacylideneoxindole in refluxing toluene afforded the functionalized spiro[cyclopentane-1,3'-indolines] in satisfactory yields. However, the similar reaction of 3-phenacylideneoxindoles with unsubstituted NH group resulted in spiro[cyclopentane-1,3'-indolines] with additional aza-buta-1,3-diene scaffold. On the other hand, the three-component reactions with 3-arylideneoxindolin- 2-ones only gave 2-(2-oxoindolin-1-yl)-3-((alkylimino)methylene)succinates. It was also interesting to find that the reaction of free amino group in two kinds of functionalized 3-methyleneoxindoles with alkylisocyanide and dialkyl acetylenedicarboxylate selectively gave C2-substituted 1-aza-buta-1,3-diene (C=C—C=NR) or C4-substituted 1-aza-buta-1,2-diene (C—C=C=NR) scaffold in the molecules.
Key words: isocyanide, dialkyl acetylenedicarboxylate, 3-phenacylideneoxindole, spiro[cyclopentane-1,3'-indoline], multicomponent reaction


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