Direct
α-alkylation of amides and the synthesis of C3-alkylated
3-hydroxyindolin-2-one/2-substituted-2-hydroxy-3,4-dihydronaphthalen-1(2
H
)-one derivatives from 2-oxindole/1-teralone were reported
using primary alcohols in the presence of Ru-NHC catalyst in a one
pot condition under the borrowing hydrogen method. In the case of
inert conditions, 2-oxindole/1-teralone exclusively forms the C3-alkylated
product. Whereas, allowing this reaction mixture to occur under an
air atmosphere predominantly forms C3-alkylated 3-hydroxyindolin-2-one
via domino C–H alkylation and aerobic C–H hydroxylation.
This Ru-NHC catalyst is easily accessible, air stable, and phosphine
free. Using this method, synthesis of 2-oxindole based natural products
such as Donaxaridine was accomplished.
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