Isomeric N-methyl-7-deazaguanines: synthesis, structural assignment, and inhibitory activity on xanthine oxidase
作者:Frank Seela、Werner Bussmann、Andreas Goetze、Helmut Rosemeyer
DOI:10.1021/jm00374a008
日期:1984.8
regiospecifically and their structures assigned. The 3-methyl compound 3 was obtained by alkylation of the parent chromophore 2a with dimethyl sulfate, and the 1-methyl isomer 5b was obtained by condensation of ethyl 2-cyano-4,4-diethoxybutyrate with N-methylguanidine and subsequent cyclization. Methylation of 2-amino-4-chloro-7H-pyrrolo[2,3-d]pyrimidine (7b), however, with methyl iodide in the presence
N-甲基异构体的2-氨基-3,7-二氢-4H-吡咯并[2,3-d]嘧啶-4-一(2a)区域特异性地合成,并指定了它们的结构。通过将母发色团2a与硫酸二甲酯烷基化而获得3-甲基化合物3,并且通过将2-氰基-4,4-二乙氧基丁酸乙酯与N-甲基胍缩合并随后环化而获得1-甲基异构体5b。然而,在相移技术下,在50%NaOH存在下,用甲基碘将2-氨基-4-氯-7H-吡咯并[2,3-d]嘧啶(7b)甲基化,然后取代卤化物通过羟基,得到7-甲基化合物2b。发现2a的N-甲基异构体都是牛奶中黄嘌呤氧化酶的抑制剂。3-甲基异构体3的Ki值为40 microM,而7-异构体和1-异构体的Ki值为4.5和3 microM,