Enantio- and regioselective [2 + 2 + 2] cycloaddition of BN-diynes for construction of C-B axial chirality
作者:Hao Wang、Bolin Qiao、Jide Zhu、Huosheng Guo、Zhen Zhang、Kai Yang、Shi-Jun Li、Yu Lan、Qiuling Song
DOI:10.1016/j.chempr.2023.09.017
日期:2024.1
asymmetric [2 + 2 + 2] cycloaddition of alkyne or nitrile motifs has received tremendous interest as it offers numerous possibilities to construct structurally diverse aromatic scaffolds with different chirality units. However, the use of these reactions is largely limited to symmetric alkynes, and the potential to use this strategy to design and construct chiral molecules is far from being explored
过渡金属催化的炔烃或腈基序的不对称[2 + 2 + 2]环加成引起了极大的兴趣,因为它为构建具有不同手性单元的结构多样的芳香支架提供了多种可能性。然而,这些反应的使用很大程度上限于对称炔烃,并且使用这种策略来设计和构建手性分子的潜力还远未得到探索。在这项工作中,我们报道了设计的不对称BN-二炔与腈或不对称炔烃的过渡金属催化的不对称[2 + 2 + 2]环加成反应。该方法提供了实际获得具有 CB 轴的具有挑战性的阻转异构体,通常具有优异的区域选择性和高对映选择性。机理研究表明,二炔的 BN-萘基部分对于 [2 + 2 + 2] 环加成的区域选择性至关重要。