Convenient Synthesis of 2,3,9,10-Tetraoxygenated Protoberberine Alkaloids and their 13-Methyl Alkaloids.
作者:Miyoji HANAOKA、Taeko HIRASAWA、Won Jea CHO、Shingo YASUDA
DOI:10.1248/cpb.48.399
日期:——
New and convenient synthesis of 2,3,9,10-tetraoxygenated protoberberine alkaloids and their 13-methyl alkaloids through the same intermediates was developed. Acylation of the brominated benzylphenethylamine (13) with alpha-chloro-alpha-(methylthio)acetyl chloride, followed by cyclization with stannic chloride, furnished the key intermediates 4-methylthio-3-phenethylisoquinolin-3-ones (14), which were
开发了通过同一中间体合成2,3,9,10-四氧合原小ber碱生物碱及其13-甲基生物碱的新方法。将溴化苄基苯乙胺(13)与α-氯-α-(甲硫基)乙酰氯酰化,然后与氯化锡环化,提供了关键中间体4-甲硫基-3-苯乙基异喹啉-3-酮(14),将其甲基化提供其甲基衍生物(17)。异喹啉-3-酮(14、17)都容易以高收率转化为原小ber碱生物碱(16)及其13-甲基生物碱(21)。