Tetrahydroisoquinoline was converted into several 1-substituted derivatives by using carbon dioxide both for N-protection and to give an intermediate carbanion stabilizing group. t-Butyllithium was used as a lithating agent at the alphacarbon atom of the secondary amino group. The resulting 1-substituted 1,2,3,4-tetrahydroisoquinoline-2-carboxylic acids underwent smooth acid-catalysed decarboxylation
通过使用
二氧化碳进行N-保护和提供中间碳负离子稳定基团,将
四氢异喹啉转化为几种1-取代的衍
生物。在仲
氨基的α碳原子处,
叔丁基锂被用作
锂化剂。在温和的条件下,将所得的1-取代的1,2,3,4-
四氢异喹啉-2-
羧酸进行平滑的酸催化脱羧。