Studies on tetrahydroisoquinolines. XXVI. A biomimetic synthesis of 5-oxygenated 1,2,3,4-tetrahydroisoquinolines.
作者:HIROSHI HARA、AKIRA TSUNASHIMA、HIROSHI SHINOKI、TOSHIFUMI AKIBA、OSAMU HOSHINO、BUNSUKE UMEZAWA
DOI:10.1248/cpb.34.66
日期:——
Treatment with acetic anhydride-conc. sulufuric acid of o-quinol acetates (7, 11, 18, 19, 20, 28 and 34), which were derived from the corresponding 6-hydroxy-7-methoxytetrahydroisoquinolines (6, 12, 15, 16, 17, 27 and 31), gave the 5, 6-diacetates (8, 13, 21, 22, 23, 29 and 33, respectively). The diacetates were transformed into the corresponding 5, 6, 7-trimethoxytetrahydroisoquinolines (10, 14, 24, 25, 26, 30 and 32) by hydrolysis and subsequent methylation.
用乙酸酐-缩合舒氟酸处理由相应的 6-羟基-7-甲氧基四氢异喹啉(6、12、15、16、17、27 和 31)衍生的邻喹啉乙酸酯(7、11、18、19、20、28 和 34),可得到 5、6-二乙酸酯(分别为 8、13、21、22、23、29 和 33)。通过水解和随后的甲基化,这些二乙酸酯被转化为相应的 5、6、7-三甲氧基四氢异喹啉(10、14、24、25、26、30 和 32)。