Copper-Catalyzed<i>N</i>-Arylation of Hindered Substrates Under Mild Conditions
作者:Michael T. Wentzel、J. Brian Hewgley、Rajesh M. Kamble、Philip D. Wall、Marisa C. Kozlowski
DOI:10.1002/adsc.200800730
日期:2009.4
Abstractmagnified imageA mild, efficient method utilizing a copper‐diamine catalyst at room temperature is reported for the coupling of hindered imidazoles with unsubstituted, ortho‐substituted, and bis‐ortho‐substituted boronic acids in good to excellent yields. Aryl halides do not reaction under these conditions permitting sequential N‐arylation reactions.
First atroposelective Chan–Lam coupling for the synthesis of C–N linked biaryls
作者:Moeka Ishida、Rina Adachi、Kazuki Kobayashi、Yukiko Yamamoto、Chinatsu Kawahara、Tsuyoshi Yamada、Hiroshi Aoyama、Kyohei Kanomata、Shuji Akai、Patrick Y. S. Lam、Hironao Sajiki、Takashi Ikawa
DOI:10.1039/d3cc05447k
日期:——
The first atroposelective Chan–Lam coupling for the synthesis of C–N axial enantiomers is reported with good yields and ee. MnO2 additive is crucial for the success of the coupling. The longstanding problem of the lack of enantioselective synthesis to make chiral C–N linked atropisomers is solved.