Copper‐Catalyzed Formation of α‐Alkoxycycloalkenones from
<i>N</i>
‐Tosylhydrazones
作者:Naijing Su、Juliana A. Theorell、Donald J. Wink、Tom G. Driver
DOI:10.1002/anie.201505993
日期:2015.10.26
The combination of 20 mol % of copper iodide and lithium tert‐butoxide triggers the formation of a broad range of substituted, functionalized α‐alkoxy 2H‐naphthalenones from readily available N‐tosylhydrazones. The data suggests that this transformation occurs through cycloaddition of a copper carbenoid with an ester, followed by a Lewis acid‐catalyzed [1,2] alkyl shift of the in situ generated alkoxyepoxide
Achieving Site Selectivity in Metal-Catalyzed Electron-Rich Carbene Transfer Reactions from <i>N</i>-Tosylhydrazones
作者:Naijing Su、Tianning Deng、Donald J. Wink、Tom G. Driver
DOI:10.1021/acs.orglett.7b01694
日期:2017.8.4
Catalyst control of the site-selectivity of electron-rich alkyl, aryl disubstituted carbenes generated in situ from o-alkenyl-substituted N-tosylhydrazones was achieved in this study. Exposure of these substrates to copper iodide triggered the formation of α-alkoxy 2H-naphthalenones. This investigation established that changing the catalyst to a rhodium(II) carboxylate turned off cyclization and migration
An efficient ruthenium catalyst system for the direct ortho CH borylation of aromatic imines is described. The reaction of tert-butyl-1-arylmethanimines with pinacolborane in the presence of Ru(cod)(cot), followed by hydrolysis, to afford the ortho-formyl-substituted arylboronates. The borylation was achieved with complete mono-selectivity.