Synthesis Of 1-Carbamatoalkyl-2-Naphthols In Tween (R) 20 Aqueous Micelles

A facile and efficient procedure for the preparation of 1-carbamatoalkyl-2-naphthols by a one-pot multi-component reaction of 2-naphthol, aldehydes and carbamates is described. The procedure is carried out under neutral conditions at 75-80 degrees C in an aqueous medium catalysed by the non-ionic surfactant Tween (R) A loading of 20.5 wt% of the catalyst was optimal. After the reaction, the catalyst could be simply recovered and reused directly without any further treatment. Product yields were slightly decreased after six cycles. The effect of some common solvents other than water on the reaction was explored besides the water. The generality of this multi-component condensation reaction was evaluated with various aldehydes and carbamates under the optimised conditions.