1,3-Dibromo 5,5-dimethylhydantoin (DBH): A novel and efficient catalyst for the synthesis of 14-aryl-14H-dibenzo[a, j] xanthenes under solvent-free conditions

Abstract

An atom-efficient and environment-friendly approach for the synthesis of aryl-14H-dibenzo[a,j]xanthenes (3a-o) via the one-pot reaction of -naphthol and aryl aldehydes (1) catalyzed by DBH has been developed. The present approach offers several advantages such as reduced reaction times, moderate temperature, higher yields, solvent free, eco-friendly reaction condition, easy purification and economic availability of the catalyst. one-pot synthesis, xanthenes, DBH, solvent free

1,3‐Dibromo 5,5‐dimethylhydantoin (DBH)‐Catalyzed Solvent‐Free Synthesis of 2‐arylbenzimidazoles under Microwave Irradiation

“…In continuation with the search for simple non-hazardous methods for the transformations in organic synthesis using halogenating agents [18][19][20][21][22][23][24][25][26] , herein we report a highly versatile and efficient synthesis of 2-aryl-benzimidazoles 3 from o-phenylenediamine, aldehyde and catalytic amounts of 1,3-dibromo 5,5-dimethyl hydantoin (DBH) under solvent-free and microwave conditions in high yields (Scheme 1).…”