aromatic aldehydes under acidic conditions. However, the epimeric trans-1,3-disubstituted tetrahydroisoquinolines 3 are also isolated as minor products. The stereochemistry of the tetrahydroisoquinolines was unambiguously assigned on the basis of the1H NMR data, and are supported by difference NOE measurements.
所述顺式-1,3-二取代的
四氢异喹啉2可以通过1,2-双(3,4-二
甲氧基苯基)在酸性条件下的脂族和芳族醛-
乙胺的Pictet Spengler环化生成一个高度非对映的方式来获得。然而,差向异构体反式-1,3-二取代的
四氢异喹啉3也作为次要产物被分离出来。基于1 H NMR数据明确分配了
四氢异喹啉的立体
化学,并由不同的NOE测量值支持。