Synthesis and application of imidazole derivatives. Synthesis of 5-methyl-7,8,9,10-tetrahydro-5H-azepino(1,2-a)benzimidazol-4-one and related compounds.
作者:Shunsaku OHTA、Yoshihiro NARITA、Masao OKAMOTO、Shoko HATAKEYAMA、Keizo KAN、Teruyuki YUASA、Kumiko HAYAKAWA
DOI:10.1248/cpb.38.301
日期:——
5-Methyl-7, 8, 9, 10-tetrahydro-5H-azepino[1, 2-α]benzimidazol-7-one (6) was synthesized by treating 1-(3-carboxypropyl)-2, 3-dimethylbenzimidazolium iodide (11) with 1, 1'-carbonyldiimidazole in the presence of triethylamine. Refluxing 2-(5-chloro-2-oxopentyl)-1-methylbenzimidazole (4) in ethyl acetate did not afford 6 but gave (Z)-1-methyl-2-(2, 3, 4, 5-tetrahydro-2-furylidenemethyl)benzimidazole (5), which was rearranged to the corresponding (E)-isomer (7) by heating in ethyl acetate in the presence of basic alumina. The structures of 5, 6 and 7 were determined by X-ray crystallography.
在三乙胺存在下,将 1-(3-羧丙基)-2,3-二甲基苯并咪唑鎓碘化物 (11) 与 1,1'-羰基二咪唑处理,合成了 5-甲基-7,8,9,10-四氢-5H-氮杂卓[1,2-α]苯并咪唑-7-酮 (6)。在乙酸乙酯中回流 2-(5-氯-2-氧代戊基)-1-甲基苯并咪唑(4)不能得到 6,但得到了(Z)-1-甲基-2-(2, 3, 4, 5-四氢-2-亚呋喃甲基)苯并咪唑(5),在碱式氧化铝存在下,在乙酸乙酯中加热,重新排列成相应的(E)-异构体(7)。5、6 和 7 的结构是通过 X 射线晶体学确定的。