Heterocyclization of functionalized heterocumulenes with C,N- and C,O-binucleophiles: IV. Reactions of 1-chloroalkylheterocumulenes and N-(1-chloroalkylidene)carbamates with 2-benzimidazolylacetonitriles and methyl 2-benzimidazolylacetates
作者:M. V. Vovk、P. S. Lebed?、V. V. Pirozhenko、I. F. Tsymbal
DOI:10.1007/s11178-005-0077-2
日期:2004.11
1-Chloroalkyl isocyanates and 1-chloroalkylcarbodiimides undergo regioselective cyclization with nitriles and esters of 2-benzimidazolylacetic acid to give derivatives of 1-oxo and 1-arylimino-1,2,3,5-tetrahydrobenzo[4,5]imidazo[1,2-c]pyrimidine respectively. The cyclocondensation of 1,1-dichloroalkyl isocyanates or N-(1-chloroalkylidene)carbamates with nitriles and esters of 2-benzimidazolylacetic acid afforded 1,5-dihydrobenzo[4,5]imidazo[1,2-c]pyrimidin-1-one derivatives.
1-氯烷基异氰酸酯和 1-氯烷基碳二亚胺与 2-苯并咪唑乙酸的腈类和酯类发生区域选择性环化反应,分别生成 1-氧代和 1-芳基亚氨基-1,2,3,5-四氢苯并[4,5]咪唑并[1,2-c]嘧啶的衍生物。1,1-二氯烷基异氰酸酯或 N-(1-氯亚烷基)氨基甲酸酯与腈类和 2-苯并咪唑乙酸酯的环缩合反应得到了 1,5-二氢苯并[4,5]咪唑并[1,2-c]嘧啶-1-酮衍生物。