Bis[1H-imidazol-4(5)-yl]alkanes (n = 4-8) have been prepared by modified Bredereck cyclization of α,Ï-dibromomethylalkanediones in formamide at 180°C. They undergo ring-cleavage acylation with methyl chloroformate to a mixture of N-formylated bis(enedicarbamates). Subsequent removal of formyl groups, reduction with palladium on charcoal and hydrolysis afford α,β,Ï-1,Ï-tetraaminoalkane tetrahydrochlorides.
双[
1H-咪唑-4(5)-基]
烷烃(n = 4-8)是通过δ,Ï-二
溴甲基烷二酮在甲酰胺中于 180°C 下的改良布雷德里克环化反应制备的。它们与
氯甲酸甲酯发生环切酰化反应,生成 N-甲酰化双(烯二
甲酸酯)混合物。随后除去甲酰基,在木
炭上用
钯还原并
水解,得到 δ±,δ²,Ï-1,Ï-四
氨基烷四盐酸盐。