描述了几种 3,3-二取代的 2-芳基丙烯酸的合成。芳基乙醛酸酯和异亚丙基三苯基正膦之间的 Wittig 反应提供了一条有效的途径来制备 2-芳基-3-甲基巴豆酸酯。这些酯用 N-溴代琥珀酰亚胺溴化得到 3-溴甲基-2-芳基巴豆酸酯和-2-芳基异巴豆酸酯的混合物。3-溴甲基巴豆酸酯在加热时环化成内酯。还制备了2-芳基-3-叠氮甲基异巴豆酸和3-氨基甲基-2-苯基异巴豆酸。已从α-甲基-和α-乙基肉桂酸酯开始,开发了一种立体定向路线,用于制备 3-叠氮甲基-2-苯基异巴豆酸和顺式-3-叠氮甲基-2-苯基-2-戊烯酸。La synth8se de plusieurs acides aryl-2 acryliques dissubstituks en position-3,3 est dkcrite。La 反应 de Wittig effectuk entre desesters arylglyoxyliques
Copper powder-catalyzed chelation-assisted cascade reaction of o-chloroarylacetic acids with amines under solvent- and ligand-free conditions: synthesis of oxindoles
An efficient method to construct oxindole scaffolds from o-chloroarylacetic acids/esters with amines has been explored. This cascade protocol involves the in situ generation of o-aminoarylacetic acid derivatives by the copper powder catalyzed and weak O-chelation assisted Ullmann amination of unactivated C–Cl bonds under air, and solvent-/ligand-free conditions followed by annulative N-acylation.