Nickel(0)-Catalyzed Cross-Coupling of Alkyl Arenesulfonates with Aryl Grignard Reagents
作者:Chul-Hee Cho、Hee-Sung Yun、Kwangyong Park
DOI:10.1021/jo026449n
日期:2003.4.1
nickel-catalyzed cross-coupling reactions of neopentyl arenesulfonates with arylmagnesium bromides, involving nucleophilic aromatic substitution of alkyloxysulfonyl groups by aryl nucleophiles, take place in high yields. Optimal efficiencies are obtained by adding 3 + 2 equiv of the Grignard reagent to a mixture of dppfNiCl(2) and the sulfonate in refluxing THF. Neopentyl arenesulfonates are useful sources of
新戊基芳烃磺酸盐与芳基溴化镁的镍催化交叉偶联反应涉及芳基亲核试剂对烷氧基磺酰基的亲核芳族取代,其收率很高。通过在回流的THF中将3 + 2当量的格氏试剂添加到dppfNiCl(2)和磺酸盐的混合物中来获得最佳效率。在这些过渡金属催化的交叉偶联反应中,新戊基芳烃磺酸盐是亲电子芳基的有用来源。芳基磺酸盐由于在反应条件下的环境反应性而不合适。这种新的交叉偶联反应可用于从芳香族化合物中创造性地消除烷氧基磺酰基,并用于制备不对称的三联苯基和低聚苯基。