Enantioselective Copper-Catalyzed Electrophilic Dearomative Azidation of β-Naphthols
摘要:
The first example of copper-catalyzed enantioselective dearomative azidation of beta-naphthols using a readily available N-3-transfer reagent is reported. A series of 2-hydroxy-1-naphthamides bearing a complex N-substituent were converted to the corresponding products in high yields with up to 96% ee, and chiral 1-azido-2-hydroxy-1-naphthoates were obtained with up to 90% ee under mild reaction conditions. The azides could be further transformed into the corresponding 1,2,3-triazoles smoothly via "click" reaction.
Deprotonative directed ortho cupration of aromatic/heteroaromatic C-H bond and subsequent oxidation with t-BuOOH furnished functionalized phenols in high yields with high regio- and chemoselectivity. DFT calculations revealed that this hydroxylation reaction proceeds via a copper (I → III → I) redox mechanism. Application of this reaction to aromatic C-H amination using BnONH2 efficiently afforded
芳族/杂芳族 CH 键的去质子定向邻铜化和随后用 t-BuOOH 氧化以高产率和高区域选择性和化学选择性提供官能化酚。DFT 计算表明,这种羟基化反应是通过铜 (I → III → I) 氧化还原机制进行的。将该反应应用于使用 BnONH2 的芳族 CH 胺化有效地提供了相应的伯苯胺。这些反应显示出广泛的范围和良好的官能团兼容性。还展示了这些转化的催化版本。