Lewis Acid-Directed Reactions of Benzoquinone Mono-/Bis-imines: Application to Syntheses of Substituted β- and γ-Tetrahydrocarbolines
作者:Thomas A Engler、Jutta Wanner
DOI:10.1016/s0040-4039(97)01391-9
日期:1997.9
Ti(IV)-promoted reactions of N-phenylsulfonyl-3- and 4-piperidone enol ethers with 2-alkoxy-4-(N-phenylsulfonyl)imino-1,4-benzoquinone afford 8-alkoxy-7-hydroxy-tetrahydrocarbolines. However, reactions promoted by BF3 produce substituted benzofurans. Ti(IV)- or BF3-promoted reactions of 2-alkoxy-1-(N-benzoyl)-4-(N-phenylsulfonyl)-1,4-benzoquinone bisimines also afford substituted tetrahydrocarboline
N-苯基磺酰基-3-和4-哌啶酮烯醇醚与2-烷氧基-4-(N-苯基磺酰基)亚氨基-1,4-苯醌的Ti(IV)促进反应生成8-烷氧基-7-羟基-四氢咔啉。然而,由BF 3促进的反应产生取代的苯并呋喃。Ti(IV)-或BF 3促进的2-烷氧基-1-(N-苯甲酰基)-4-(N-苯磺酰基)-1,4-苯醌双亚胺的反应也提供了取代的四烃基衍生物。©1997爱思唯尔科学有限公司。