Li Jing-hua
2012
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Journal
Journal of Zhejiang University of Technology
Abstract
2-Hydroxycarbazole belongs to an important class of organic intermediates.However, there are few reports of its synthesis and several shortcomings such as complicated preparation processes,too many reaction steps,low yield,high cost and so on.A simple and efficient procedure for 2-hydroxycarbazole was synthesized by photocatalytic intramolecular cyclization of 3-(2-chlorophenylamino) phenol which was prepared from 2-chloroaniline and 1,3-benzenediol. The effect of different light,reaction times,bases,solvents on the reaction was examined.The optimum 2-hydroxycarbazole synthetic conditions which was illuminated in the light of ultraviolet lamp,potassium phosphate as a base,methanol as a solvent was obtained.The yield of final product was increased to 51.6%and the final product was confirmed by ~1H-NMR,