Regioselective Pd(0)-Catalyzed Hiyama Cross-Coupling Reactions at Dihalo-Substituted Heterocycles
作者:Thorsten Bach、Stefan Schweizer
DOI:10.1055/s-0029-1218528
日期:2010.1
The regioselectivity of the Hiyama cross-coupling reaction at various dihalo-substituted heterocycles has been studied. Methyl 2,3-dibromo-5-furancarboxylate and n-octyltrifluorosilane were employed to find optimum reaction conditions [CsF; Pd2dba3/P(2-furyl)3 as catalyst, 80-150 ËC in toluene or benzene] for the desired transformation. Subsequent experiments with the title compounds and with different primary alkyltrifluorosilanes illustrate the generality of this regiochemical process.
已经研究了各种二卤取代杂环的Hiyama交叉偶联反应的区域选择性。使用了甲基2,3-二溴-5-呋喃羧酸酯和正辛基三氟硅烷来寻找最佳反应条件【CsF;催化剂Pd2dba3/P(2-呋喃基)3,在甲苯或苯中反应温度为80-150 ℃】以实现所需的转化。后续实验涉及标题化合物和不同的初级烷基三氟硅烷,展示了这一区域化学过程的普遍性。