Herein, we describe the dual C(sp3)–H
bond functionalization
of a tertiary amine through hydride-transfer-induced dehydrogenation,
followed by cycloaddition, using an easily preparable diazoester as
a new type hydride-acceptor precursor under mild, redox-neutral conditions.
With carbene as a hydrogen acceptor, this method was demonstrated
by the preparation of a broad range of functionalized isoxazoldines
in moderate to good yields.
Herein,
we report a blue visible-light-promoted approach for preparing
a variety of α-substituted γ-ketoester derivatives through
carbene insertion and the decarbonylation of enaminones and diazoesters.
These reactions use readily available starting materials and transition-metal-free,
eco-friendly procedures that are amenable to gram-scale synthesis
and wide functional group tolerance. This methodology may be useful
for constructing polysubstituted heterocycles with potential biological
activity.
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