New Syntheses of Alkylaryl and Diaryl Disubstituted Phenols and Ethyl Salicylates The sodium acetate- or triethylamine-catalyzed reaction of the chalcones and chalcone analogues 1a-n with 1-(2-oxopropyl)pyridinium chloride (2) or 1-(3-ethoxycarbonyl-2-oxopropyl)pyridinium bromide (3) gives the 3,5-disubstituted phenols (6a-g) or the 4,6-disubstituted ethyl 2-hydroxybenzoates (7a-1) in yields from 25 to 83α. Both reactions fail for chalcones with one o-substituted aryl substituent or for p,p′-dinitro-substituted diarylchalcones.
新合成的烷基芳基和二芳基双取代
酚及
乙酸水杨酸盐
醛酮和醛
酮类似物1a-n与1-(2-氧丙基)
吡啶铵氯化物(2)或1-(3-乙氧基羧基-2-氧丙基)
吡啶铵溴化物(3)在
醋酸钠或
三乙胺催化下反应,得到3,5-双取代
酚(6a-g)或4,6-双取代
乙酸2-羟基苯甲酸盐(7a-1),产率从25%到83%不等。这两种反应在具有一个o-取代芳基替代基或p,p′-二硝基取代的二芳基醛酮时均未成功。