Synthesis of 1,5,6,7-tetrahydro-4H-benzimidazol-4-one derivatives from 2,6-bis(hydroxyimino)cyclohexan-1-one
作者:V. A. Samsonov
DOI:10.1134/s1070428017010122
日期:2017.1
The reaction of 2,6-bis(hydroxyimino)cyclohexan-1-one with aldehydes and ammonia afforded 2-substituted 4-hydroxyimino-4,5,6,7-tetrahydro-1H-benzimidazol-1-ols which were hydrolyzed to 1-hydroxy- 2-R-1,5,6,7-tetrahydro-4H-benzimidazol-4-ones. The N-hydroxy group in the latter can readily by removed by the action of chloroacetone in the presence of a base (potassium carbonate or triethylamine); as a
2,6-双(羟基亚氨基)环己酮-1-酮与醛和氨的反应得到2-取代的4-羟基亚氨基-4,5,6,7-四氢-1 H-苯并咪唑-1-醇,其被水解为1-羟基-2-R-1,5,6,7-四氢-4 H-苯并咪唑-4-酮。后者中的N-羟基可通过在碱(碳酸钾或三乙胺)存在下,通过氯丙酮的作用而容易地除去;结果,获得2-取代的1,5,6,7-四氢-4 H-苯并咪唑-4-酮。