Total chemical synthesis and antitumor evaluation of the 9-aza analog of N-(trifluoroacetyl)-4-demethoxydaunomycin
作者:Lester A. Mitscher、Harpal Gill、Joyce A. Filippi、Richard L. Wolgemuth
DOI:10.1021/jm00157a027
日期:1986.7
8-dimethoxy-1,2,3,4-tetrahydroisoquinoline. Selective N-acetylation and subsequent Friedel-Crafts acylation with phthalic anhydride produced 2-acetyl-5,12-dihydroxy-1,2-dihydro-2-azanaphthacene-6,11-dione, which was protected as its dimethyl ether and epoxidized to an acylated aza Brigl's anhydride. This was converted to (+/-)-2-acetyl-4-hydroxy-5,12-dimethoxy-1,2,3,4-tetrahydro-2- azanaphthacene-6,11-dione by
N-(三氟乙酰基)-4-脱甲氧基柔红霉素的9-氮杂类似物是由2,5-二甲氧基苯甲醛合成的。Pomeranz-Fritsch缩合反应,然后进行硼氢化物还原反应和酸催化的环化反应,平稳地生成了4-羟基-5,8-二甲氧基-1,2,3,4-四氢异喹啉。选择性的N-乙酰化和随后的邻苯二甲酸酐的Friedel-Crafts酰化反应生成2-乙酰基5,12-二羟基-1,2-二氢-2-氮杂并蒽-6,11-二酮,将其作为二甲醚进行保护并环氧化为酰化的氮杂布里格酸酐。通过脱水成4-酮基,将其转化为(+/-)-2-乙酰基-4-羟基-5,12-二甲氧基-1,2,3,4-四氢-2-氮杂并蒽-6,11-二酮。类似物,然后逐步或原位还原氰基硼氢化物。用三氯化硼除去保护基,并用旋光的N,O-双(三氟乙酰基)金葡糖胺溴化物和三氟甲磺酸银将所得的糖苷配基糖苷化。通过柱色谱分离得到的非对映异构体,并通过CD和NMR光谱确定其结构