作者:Zheng‐Jun Wang、Xiangyang Chen、Lei Wu、Jonathan J. Wong、Yong Liang、Yue Zhao、Kendall N. Houk、Zhuangzhi Shi
DOI:10.1002/anie.202016573
日期:2021.4.6
conspicuously underdeveloped. Here, we develop a general strategy for the site‐selective C−H borylation of pyrroles by using only BBr3 directed by pivaloyl groups, avoiding the use of any metal. The site‐selectivity is generally dominated by chelation and electronic effects, thus forming diverse C2‐borylated pyrroles against the steric effect. The formed products can readily engage in downstream transformations
仍然明显缺乏开发能以选择性,实用,低成本和环境友好的模式快速构建复杂的有机硼酸酯的稳健策略。在这里,我们通过仅使用由新戊酰基引导的BBr 3避免了使用任何金属,为吡咯的位点选择性CH硼化开发了一种通用策略。通常,位点选择性主要受螯合和电子效应的影响,因此形成了多种C2硼化的吡咯,以抵抗空间效应。成型产品可以很容易地参与下游转型,从而实现了逐步经济的过程来获得立普妥(Lipitor)等药物。DFT计算(wB97X-D)证明了该反应的首选位置选择性。