Naber John R, Fors Brett P, Wu Xiaoxing, Gunn Jonathon, Buchwald Stephen L
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Heterocycles. 2010 Feb 26;80(2):1215-1226. doi: 10.3987/COM-09-S(S)105.
A catalyst system for the Stille cross-coupling reactions of aryl mesylates and tosylates is reported. Using the combination of Pd(OAc), XPhos, and CsF in -BuOH an array of aryl and heteroaryl sulfonates were successfully employed in these reactions. Morever, heteroarylstannanes, such as furyl, thiophenyl, and -methylpyrrole, which are often prone to decomposition, were efficiently coupled under these conditions. -substitution on the stannane coupling partner was well tolerated; however, the presence of substituents on the aryl sulfonates greatly reduced the proficiency of these reactions.
报道了一种用于芳基甲磺酸酯和甲苯磺酸酯的Stille交叉偶联反应的催化剂体系。使用Pd(OAc)₂、XPhos和CsF在叔丁醇中的组合,一系列芳基和杂芳基磺酸盐成功地用于这些反应。此外,经常易于分解的杂芳基锡烷,如呋喃基、噻吩基和N-甲基吡咯,在这些条件下能有效偶联。锡烷偶联伙伴上的α-取代具有良好的耐受性;然而,芳基磺酸盐上存在β-取代基会大大降低这些反应的效率。