Gold Catalysis, Asymmetric Friedel–Crafts Alkylation Cascade for One-Pot Synthesis of Chiral Dihydrocarbazoles and Dihydrodibenzofurans
作者:Xuan Wang、Ai-Hua Zhou、Tian-Qi Hu、Zhou Xu、Bo Zhou、Long-Wu Ye
DOI:10.1021/acs.orglett.4c00311
日期:2024.3.15
A one-pot gold-catalyzed acyl migration followed by ytterbium-catalyzed asymmetric Friedel–Crafts alkylation is disclosed, leading to the rapid synthesis of chiral dihydrocarbazoles and dihydrodibenzofuran in generally moderate to good overall yields with good to excellent enantioselectivities. The gold-catalyzed acyl migration of propargyl acetates generates α-ylidene-β-diketones with high E/Z ratios
公开了一锅金催化的酰基迁移,然后是镱催化的不对称弗里德尔-克来福特烷基化,导致手性二氢咔唑和二氢二苯并呋喃的快速合成,总体产率中等至良好,具有良好至优异的对映选择性。金催化乙酸炔丙酯的酰基迁移生成具有高E / Z比的 α-亚基-β-二酮,然后将其进行镱催化的不对称 Friedel-Crafts 烷基化,无需任何纯化。重要的是,该方案为不对称弗里德尔-克来福特烷基化提供了一种新型底物。