is reported. Specifically, a dioxaborole is prepared that undergoes [2 + 2] cycloadditions with a wide variety of alkenes. This strategy overcomes some challenges with the cycloaddition of acyclic substrates. The products can be easily transformed into cyclobutyl diols or 1,4-dicarbonyl compounds; the latter represents a formal alkene vicinal diacylation. The synthetic utility of this method is shown
报道了一种通过临时环约束实现光敏 [2 + 2] 环加成反应的策略。具体来说,制备了一种二氧
硼酰胺,它与多种烯烃进行 [2 + 2] 环加成反应。该策略克服了无环底物的环加成的一些挑战。该产物可容易转化为
环丁基二醇或 1,4-二羰基化合物;后者代表正式的烯烃邻近二基化。该方法的合成效用表现在有价值的杂环和双孢菌素 D 的合成中。