The intramolecular 1,3-dipolar cyclisation of mesoionic species generated by the thermolysis of the mixed anhydrides of acetic and N-alkynoyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acids
作者:Malcolm Sainsbury、Rosalind H. Strange、Peter R. Woodward、Paul A. Barsanti
DOI:10.1016/s0040-4020(01)86306-7
日期:1993.3
The intramolecular cyclisations of mesoionic intermediates formed by heating N-alkynoyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acids [alkylnoyl side chains: RCC-(CH2)2CO, where n = 3 or 4] with acetic anhydride, have been investigated. The final products are octahydropentaleno[2,3-a]isoquinolines and hexahydroindeno[2,3-a]isoquinolines respectively, formed by the expulsion of carbon dioxide from
通过加热N-炔基-1,2,3,4-四氢异喹啉-3-羧酸[烷酰基侧链:RCC-(CH 2)2 CO,其中n = 3或4]形成的介电中间体的分子内环化用乙酸酐进行研究。最终产品是octahydropentaleno [2,3-一个]异喹啉和hexahydroindeno [2,3-一个]异喹啉分别由二氧化碳的从最初的加合物驱逐形成。还研究了分子间形式的环加成反应中烯烃和炔烃作为亲二烯体的行为。带有吸电子基团的炔烃提供吡咯并[1,2- b异喹啉,但除非使用烯烃,如亚苄基亚甲基苯二腈(首先形成的加合物可在失去CO 2之前消除HCN),否则反应将失败。