We report bench-stable cyclobutenone surrogates that undergo Rh-catalyzed addition of aryl- and vinylboronic acids to yield cyclobutenyl enol ethers in high yields and excellent enantioselectivities. This transformation proceeds via enantioselective carbometalation to give cyclobutyl-rhodium intermediates, followed by β-oxygen elimination. The reaction is fast and proceeds under mild conditions.
我们报道了实验室稳定的
环丁烯酮替代物,它们经过 Rh 催化的芳基
硼酸和
乙烯基硼酸加成,以高产率和优异的对映选择性生成
环丁烯基烯醇醚。该转化通过对映选择性碳
金属化进行,得到
环丁基铑中间体,然后消除β-氧。该反应快速且在温和条件下进行。