Effect of the Structure of 1-Aza-1,3-dienes on 1,2- versus 3,4-Selectivity in Cycloaddition Reactions with Homophthalic Anhydride†
作者:Angelina Georgieva、Elena Stanoeva、Ivanka Topalova、Christo Tchanev、Stefan Spassov
DOI:10.1039/a605993g
日期:——
The reaction of homophthalic anhydride 1 with
N-(cinnamylidene)tritylamine 2a proceeds as a
3,4-cycloaddition to give
4-oxo-1,2,3,4-tetrahydronaphthalene-1-carboxylic acids 3, with
N-(cinnamylidene)benzylamine 2b as a 1,2-cycloaddition
with the predominant formation of a
1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid, and with
either 2a or cinnamaldehyde in the presence of Et
3
N
with the formation of a
2-oxonaphtho[1,2-b]pyran-6-carboxylic acid.
均苯二甲酸酐 1 与 N-(亚肉桂基)三乙胺 2a 发生 3,4-Cycloaddition 反应,生成 4-氧代-1,2,3,4-四氢萘-1-羧酸 3,与 N-(亚肉桂基)苄胺 2b 发生 1.2-Cyloaddition 反应,主要生成 1-氧代-1,2,3,4-四氢异喹啉-4-羧酸、2-氰基加成,主要生成 1-氧代-1,2,3,4-四氢异喹啉-4-羧酸;在 Et 3 N 存在下,与 2a 或肉桂醛加成,生成 2-氧代萘并[1,2-b]吡喃-6-羧酸。