An improved procedure for the synthesis of 1-alkyl-5-(alkylamino)-imidazole-4-carboxamides, synthetic intermediates for 3,9-dialkylpurine derivatives.
作者:TAISUKE ITAYA、KAZUO OGAWA、HIROO MATSUMOTO、TOMOKO WATANABE
DOI:10.1248/cpb.28.2819
日期:——
Heating N, N-diethyl-3, 9-dialkyladeninium halides (Ig-j) in aqueous sodium hydroxide gave 1-alkyl-5-(alkylamino)imidazole-4-carboxamides (IV) together with minor amounts of 1-alkyl-5-(alkylamino)imidazole-4-carbonitriles (III), which were converted into IV on further heating. N, N-Dimethyl-3, 9-dialkyladeninium halides (Ia-d) underwent hydrolysis more rapidly to provide IV selectively in 90-94% yields.
将N,N-二乙基-3,9-二烷基腺苷盐(Ig-j)在氢氧化钠水溶液中加热,获得了1-烷基-5-(烷基氨基)咪唑-4-羧酰胺(IV),同时也得到少量的1-烷基-5-(烷基氨基)咪唑-4-氰基(III),后者在进一步加热后转化为IV。N,N-二甲基-3,9-二烷基腺苷盐(Ia-d)则更快地发生水解,选择性地提供IV,产率为90-94%。