reactions with electrophiles furnish the products 6–22, 26, 27, see Table 1 and the Scheme. A second alkylation is also possible, see 23–25. The cleavage to tetrahydroisoquinolines is accomplished in refluxing aqueous-methanolic hydrochloric acid, see Table 2. Phosphinoylation, lithiation, reaction with electrophiles and cleavage constitute an efficient sequence for 1-alkylation of the isoquinoline nucleus
标题化合物4由
磷酸酰胺5在
四氢呋喃中与丁基
锂生成。
锂试剂4在室温下稳定。其与亲电反应提供产品6-22,26,27,参见表1和方案。第二次烷基化也是可能的,请参阅23–25。在回流的含
水甲醇盐酸中完成
四氢异喹啉的裂解,参见表2。膦酰基化,
锂化,与亲电试剂反应和裂解构成
异喹啉核1烷基化的有效序列。