2,4,6-Trichloro-1,3,5-triazine as an Efficient Catalyst for Synthesis of Benzopyran Derivatives under Solvent-Free Conditions
作者:Peng Zhang、Yong-Dong Yu、Zhan-Hui Zhang
DOI:10.1080/00397910802369604
日期:2008.11.13
Abstract An efficient and convenient procedure has been developed for the synthesis of benzopyran derivatives by one-pot condensation of substituted salicyaldehydes and substituted 1,3-hexanediones in the presence of a catalytic amount of 2,4,6-trichloro-1,3,5-triazine (TCT, cyanuric chloride) undersolvent-freeconditions.
Abstract A series of 1‐oxo‐1,2,3,4,9,10‐hexahydroxanthene derivatives were synthesized from substituted salicylaldehydes and substituted 1,3‐hexanedione in water at 90°C catalyzed by TEBA. The structure of the product was confirmed by X‐ray analysis. Compared with other synthetic methods, this new method has the advantages of easier workup, milder reaction conditions, high yields (85 ∼ 95%) and environmentally