afford only (E)-trisubstituted enamides. Also, palladium-catalyzed intramolecular cyclization of (E)- and (Z)-α-chloro-γ-hydroxyenamides bearing an N-arylsulfonyl group took place stereoselectively to give the corresponding (E)-2,3-dihydrobenzoisothiazole 1,1-dioxides. The γ-hyroxy group in α-chloroenamides was found to accelerate the present palladium-catalyzed carbon-carbon bond forming reactions.
通过使用Pd 2(dba)3,t Bu 3 P和Cs 2 CO 3进行(E)-和(Z)-α-
氯-γ-羟基烯酰胺与苯
硼酸的Suzuki反应进行立体选择,仅得到(E)-三取代的酰胺。而且,带有N-芳基磺酰基的(E)-和(Z)-α-
氯-γ-羟基烯酰胺的
钯催化的分子内环化也进行了立体选择,得到了相应的(E)-2,3-二氢苯并
异噻唑1,1-二氧化物。发现α-
氯亚酰胺中的γ-羟基可加速目前的
钯催化的碳-碳键形成反应。