Palladium-Catalyzed Desulfitative Mizoroki-Heck Couplings of Sulfonyl Chlorides with Mono- and Disubstituted Olefins: Rhodium-Catalyzed Desulfitative Heck-Type Reactions under Phosphine- and Base-Free Conditions
作者:Srinivas Reddy Dubbaka、Pierre Vogel
DOI:10.1002/chem.200400838
日期:2005.4.22
olefins with arenesulfonyl and trifluoromethanesulfonyl chlorides. Thus (E)-1,2-disubstituted alkenes with high stereoselectivity and 1,1,2-disubstituted alkenes with 12:1 to 21:1 E/Z steroselectivity can be obtained. Herrmann's palladacycle at 0.1 mol % is sufficient to catalyze these reactions, for which electron-rich or electron-poor sulfonyl chlorides and alkenes are suitable. If phosphine- and base-free
已经发现了新的条件,用于用芳烃磺酰氯和三氟甲烷磺酰氯对单取代和无取代的烯烃进行脱硫的Mizoroki-Heck芳基化和三氟甲基化。因此,可以获得具有高立体选择性的(E)-1,2-二取代的烯烃和具有12:1至21:1的E / Z立体选择性的1,1,2-二取代的烯烃。0.1摩尔%的赫尔曼(Hermann)的Palladacycle足以催化这些反应,对此,富电子或贫电子的磺酰氯和烯烃是合适的。如果需要无磷和无碱条件,则1摩尔%[RhCl(C(2)H(4))(2)]催化脱硫交叉偶联反应。与报道的[RuCl(2)(PPh(3))(2)]催化与磺酰氯偶联反应的结果相反,自由基清除剂不会抑制钯和铑的脱硫Mizoroki-Heck偶联反应。在Pd或Rh催化剂的存在下,在更高的温度下,烯烃在60摄氏度下磺酰化产生的可能的砜不会被脱硫。