SYNTHESIS OF SOME BICYCLIC OXAZOLO- AND OXAZEPINOPYRIMIDINE DERIVATIVES

Oxazolopyrimidine compounds 2(a–c) and 3(a–e) were synthesized by a simple one-pot condensation reaction of the pyrimidine derivative 1 with 1,2-dibromoethane and 2-bromopropanoic acid, respectively. In a similar way the oxazepinopyrimidine compounds 4(a–b) were synthesized by reaction of 1 and 1,4-dichlorobutane in dioxane under reflux condition. The yields of products following recrystallization were of the order of 55–85%.