InCl_3 centre dot 4H_2O-promoted green preparation of xanthenedione derivatives in ionic liquids

摘要

A green procedure for the synthesis of xanthenedione derivatives (3) through InCl_3 centre dot 4H_2O-promoted condensation of aldehydes (1) and 5,5-dimethyl-l,3-cyclohexanedione (2) in ionic liquids is described in this paper. This novel method has such advantages as operational simplicity and environmental benignancy together with enhanced atom utilization. Moreover, the reaction media and the catalyst can be recovered conveniently and reused effectively for at least six times.