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
ortho-Selective C–H borylation of aryl ketones with bis(pinacolato)diboron proceeded at 120 °C in octane in the presence of a catalytic amount of iridium(I) complexes comprising 1/2[Ir(OMe)(cod)]2 and AsPh3.
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
aliphatic substrates for selective C(sp3)–H bond borylations. Heterocyclic molecules are selectively borylated using the inherently elevated reactivity of the C–H bonds. A number of late-stage C–H functionalization have been described using the same catalysts. Furthermore, we show that one of the catalysts could be used even in open air for the C(sp2)–H and C(sp3)–Hborylations enabling the method more general