Scope and limitations of the Heck–Matsuda-coupling of phenol diazonium salts and styrenes: a protecting-group economic synthesis of phenolic stilbenes
作者:Bernd Schmidt、Nelli Elizarov、René Berger、Frank Hölter
DOI:10.1039/c3ob40420j
日期:——
4-Phenol diazonium salts undergo Pd-catalyzed Heck reactions with various styrenes to 4′-hydroxy stilbenes. In almost all cases higher yields and fewer side products were observed, compared to the analogous 4-methoxy benzene diazonium salts. In contrast, the reaction fails completely with 2- and 3-phenol diazonium salts. For these substitution patterns the methoxy-substituted derivatives are superior
4-苯酚重氮盐与各种苯乙烯进行Pd催化的Heck反应,生成4'-羟基苯乙烯。与类似的4-甲氧基苯重氮盐相比,几乎在所有情况下均观察到更高的收率和更少的副产物。相反,用2-和3-苯酚重氮盐使反应完全失败。对于这些取代方式,甲氧基取代的衍生物是优越的。