Asymmetric 1,2-diaxial synthesis of bi-(hetero)aryl benzofulvene atropisomers <i>via</i> transient directing group-assisted dehydrogenative coupling
作者:Soumyadip Hore、Abhijeet Singh、Ravi P. Singh
DOI:10.1039/d3cc06011j
日期:——
cross-dehydrogenative coupling of electronically rich and sterically congested benzofulvene with bi-(hetero)aryl moieties to construct an axially chiral benzofulvene core remains a formidable task. In this study, we describe a highly efficient and practical palladium-catalyzed approach for atroposelective bi-(hetero)aryl benzofulvene synthesis, achieving excellent enantioselectivity with moderate yields.
电子丰富且空间拥挤的苯并富烯与双(杂)芳基部分的有效交叉脱氢偶联以构建轴向手性苯并富烯核仍然是一项艰巨的任务。在这项研究中,我们描述了一种高效实用的钯催化方法,用于对映选择性双(杂)芳基苯并富烯的合成,实现了优异的对映选择性和中等的产率。该协议为苯并富烯的 C-H 键直接区域和对映选择性转化为 C-C 键提供了绝佳的机会。此外,该方案允许将苯并富烯与 4-苯基香豆素核心结合,从而获得一类新型的轴向手性香豆素。