With the catalysis of CuI/L-proline, a number of 2-(3-bromobut-3-enyl)malonates underwent efficient intramolecular C-vinylation leading to the synthesis of functionalized alkylidenecyclobutanes. Competition experiments revealed that this four-membered ring closure is fundamentally preferred over the corresponding five-membered ring closure.
在CuI /
L-脯氨酸的催化下,许多2-(3-
溴丁-3-烯基)
丙二酸酯进行了有效的分子内C-
乙烯基化,从而合成了官能化的亚烷基
环丁烷。竞争实验表明,与相应的五元环封闭相比,这种四元环封闭从根本上更受青睐。