Studies on xanthine derivatives. I. Formation of tricyclic heterocycles from hydrolysates of 1-(5-oxohexyl)theobromine (pentoxifylline).
作者:TSUYOSHI TSUJIYAMA、TSUTOMU OHSAKI、KAZUTAKA MATSUBARA、AKIMITSU SANO、TAKEO KURIKI、NOBUO SUZUKI
DOI:10.1248/cpb.30.3088
日期:——
1-(5-Oxohexyl) theobromine (I) in alkaline solution was hydrolyzed by heating to give 4-(methylamino)-1-methyl-5-(5-oxohexyl) aminocarbonylimidazole (II) and N-[4-(5-carboxy-1-methylimidazolyl)]-N-methyl-N'-(5-oxohexyl) urea (III). When acidified with HCl, II and III were cyclized to 4, 4a, 5, 6, 7, 8-hexahydro-10-oxo-1, 4, 4a-trimethyl-1H-pyrido [1, 2-a]-purine (IV) and 4, 5, 7, 8, 9, 10-hexahydro-5, 12-dioxo-1, 4, 10a-trimethyl-1H-pyrido [2', 1' : 2, 3]-imidazo [4, 5-f] oxadiazocine hydrochloride (V), respectively.
碱性溶液中的 1-(5-氧代己基)可可碱(I)经加热水解后得到 4-(甲基氨基)-1-甲基-5-(5-氧代己基)氨基羰基咪唑(II)和 N-[4-(5-羧基-1-甲基咪唑基)]-N-甲基-N'-(5-氧代己基)脲(III)。当用盐酸酸化时,II 和 III 环化成 4, 4a, 5, 6, 7, 8-六氢-10-氧代-1, 4, 4a-三甲基-1H-吡啶并[1, 2-a]-嘌呤(IV)和 4, 5, 7, 8, 9, 10-六氢-5, 12-二氧代-1, 4, 10a-三甲基-1H-吡啶并[2', 1' :2,3]-咪唑并[4,5-f]恶二唑嗪盐酸盐(V)。