Chemical transformation of protoberberines. XIII. A novel and efficient synthesis of antitumor benzo[c]phenanthridine alkaloids, nitidine and fagaronine.
作者:MIYOJI HANAOKA、HIROSHI YAMAGISHI、MARI MARUTANI、CHISATO MUKAI
DOI:10.1248/cpb.35.2348
日期:——
An efficient synthesis of nitidine (1a).and fagaronine (1c), antitumor 2, 3, 8, 9-tetraoxygenated benzo [c] phenanthridine alkaloids, has been achieved via regioselective C6-N bond cleavage, followed by consecutive oxy-functionalization and recyclization between the C6 and C13 positions of the starting protoberberines, pseudoberberine (3a) and O-benzyldehydrodiscretine (3b), respectively.
通过区域选择性 C6-N 键裂解,然后分别在起始原小檗碱、假小檗碱(3a)和 O-苄基脱氢二小檗碱(3b)的 C6 和 C13 位之间进行连续的氧官能化和再官能化,高效合成了硝基(1a)和法加龙碱(1c)这两种抗肿瘤的 2,3,8,9-四氧合苯并[c]菲啶生物碱。