A new pathway to substituted 6-chloro-2-pyridinecarboxylic acid derivatives from the reaction of 4,6-dichloro-2-oxa-5-aza-bicyclo[2.2.2]oct-5-en-3-ones with nucleophiles
作者:Kristof J. Dubois、Georges J. Hoornaert
DOI:10.1016/0040-4020(96)00304-3
日期:1996.5
Reaction of alcohols or amines with 4,6-dichloro-2-oxa-5-azabicyclo[2.2.2]oct-5-en-3-ones gives direct conversion into (3,(4,))5-substituted 6-chloro-2-pyridinecarboxylic acid derivatives via selective lactone cleavage followed by rapid elimination of HCl and H2O in the presence of DBU.
醇或胺与4,6-二氯-2-氧杂-5-氮杂双环[2.2.2] oct-5-en-3-ones的反应直接转化为(3,(4,))5-取代的6-通过选择性裂解内酯氯-2-吡啶羧酸衍生物,接着的盐酸和H迅速消除2在DBU存在O操作。