Synthesis of a new triprotonated ligand and selective o-demethylation of methyl aryl ether by boron tribromide
作者:N. Cheraïti、M.E. Brik
DOI:10.1016/s0040-4039(99)00786-8
日期:1999.6
Selective O-demethylation of the ortho methyl catecholate of N,N′,N″-tris-(2,3-dimethoxybenzoyl)-1,1,1-tris-(L-methioninemehyl)-ethane () has been accomplished by boron tribromide. The intramolecular nucleophilic attack of divalent sulphur on methyl enhance this cleavage, favours this selctivity and consequently afford the triprotonated ligand N,N′,N″-tris-(2-hydroxy-3-methoxybenzoyl)-1,1,1-tris-(
N,N',N'' -tris-(2,3-二甲氧基苯甲酰基)-1,1,1-tris-(L-甲硫氨酸甲基)-乙烷()的邻苯二酚邻苯二甲酸甲酯的选择性O-去甲基化已通过硼完成三溴化物。二价硫对甲基的分子内亲核攻击增强了这种裂解,有利于这种选择性,因此提供了三重配体N,N',N''- tris-(2-羟基-3-甲氧基苯甲酰基)-1,1,1-tris- (L-蛋氨酸甲基)-乙烷(),收率高。