Bis[1H-imidazol-4(5)-yl]alkanes and 1,2,9,10- and 1,2,11,12-Tetraaminoalkane Tetrahydrochlorides
作者:Bernhard Miller、Janina Altman、Wolfgang Beck
DOI:10.1055/s-1997-4464
日期:1997.3
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。