Reaction of 1-hydroxycarbazole-2-carbaldehydes 1 with phenacyl bromide yielded 2-benzoyl-10H-furo[2,3-a]carbazoles 2, whereas the reaction with ethyl bromoacetate yielded 1-oxo-1,2-dihydro[1,4]oxazino[2,3,4-jk]carbazole-4-carbaldehyde (4). The reaction of 1 with ethyl acetoacetate and also with diethyl malonate yielded the pyranocarbazoles 6 and 7, respectively. All the products were characterized by spectral and analytical means. Plausible mechanisms of product formation are proposed.
1-羟基咔唑-2-甲醛(1)与苯
乙酰溴反应生成2-苯甲酰基-10H-
呋喃[2,3-a]
咔唑(2),而与
溴乙酸乙酯反应生成1-氧代-1,2-二氢[1,4]
噁唑并[2,3,4-jk]
咔唑-4-
甲醛(4)。1与
乙酰乙酸乙酯反应和与
双乙酯
马来酸酯反应分别生成
吡喃
咔唑(6)和(7)。所有产物均通过光谱和分析手段进行了表征。提出了产物形成的合理机理。