Reaction between isocyanides and dialkyl acetylenedicarboxylates in the presence of 4,5-diphenyl-1,3-dihydro-2H-imidazol-2-one. One-pot synthesis of 5H-imidazo[2,1-b][1,3]oxazine derivatives
The reactive 1:1 intermediate produced in the reaction between alkyl or aryl isocyanides and dialkylacetylenedicarboxylates was trapped by 4,5-diphenyl-1,3-dihydro-2H-imidazol-2-one to yield highly functionalized 2,3-diphenyl-5H-imidazo[2,1-b][1,3]oxazinederivatives in fairly good yields.
在烷基或芳基异氰酸酯与乙酰二羧酸二烷基酯之间的反应中生成的反应性1:1中间体被4,5-二苯基-1,3-二氢-2 H-咪唑-2-酮捕获,从而生成高度官能化的2,3-二苯基-5 H-咪唑并[2,1- b ] [1,3]恶嗪衍生物的收率相当好。