PROCESS FOR REGIOSELECTIVE DEMETHYLATION OF P-METHOXY GROUP IN PHENOLIC ESTER AND DIARYL KETONE MOIETIES
申请人:Negi Singh Arvind
公开号:US20060052463A1
公开(公告)日:2006-03-09
Demethylation of 3′,4′-dimethoxy or 3′,4′,5′-trimethoxy benzoic ester of a phenol is carried out in the presence of an excess of aluminum halide in an organic solvent to get 4′-Hydroxy, 3′-methoxy or 4′ hydroxy, 3′,5′-dimethoxy benzoic acid ester of a phenol. The reaction is also applicable to 3′,4′,5′-trimethoxy diaryl ketone and some natural products like reserpine.
苯酚的3′,4′-二甲氧基或3′,4′,5′-三甲氧基苯甲酸酯的去甲基化是在有机溶剂中过量使用铝卤化物的情况下进行的,以得到苯酚的4′-羟基,3′-甲氧基或4′羟基,3′,5′-二甲氧基苯甲酸酯。该反应也适用于3′,4′,5′-三甲氧基二芳基酮和一些天然产物,如利血平。