Studies on tetrahydroisoquinolines. XVII. A synthesis of 8-halo-1,2,3,4-tetrahydroisoquinolines.
作者:HIROSHI HARA、OSAMU HOSHINO、BUNSUKE UMEZAWA
DOI:10.1248/cpb.29.51
日期:——
Treatment with conc. hydrochloric acid of p-quinol acetates (1) obtained from 7-hydroxy-1, 2, 3, 4-tetrahydroisoquinolines (4) gave the corresponding 8-chloro-7-hydroxy-1, 2, 3, 4-tetrahydroisoquinolines (5) in good yields. Similarly, by using conc. hydrobromic acid or 38% hydriodic acid, 8-bromo (6)- or 8-iodo-corypalline (7) was obtained.
用浓
盐酸处理从 7-羟基-1,2,3,4-
四氢异喹啉(4)中得到的对
喹啉乙酸酯(1),可以得到相应的 8-
氯-7-羟基-1,2,3,4-
四氢异喹啉(5),收率很高。同样,通过使用浓
氢溴酸或 38% 的
氢碘酸,可以得到 8-
溴 (6)- 或 8-
碘-堇菜碱 (7)。