In recent years, methyl formate has
received considerable attention
as an ideal and green C1 building block to synthesize carboxylic esters.
However, examples of a one-step route to esters with one-carbon elongation
using methyl formate as a source of methoxycarbonyl radical are still
rare. Herein, we present peroxide-induced radical carbonylation of N-(2-methylallyl)benzamides with methyl formate as the precursor
of methoxycarbonyl radical and RuCl3 as catalyst, affording
a series of biologically valuable 4-[(methoxycarbonyl)methyl]-3,4-dihydroisoquinolinones
with good tolerance and insensitivity to moisture in one pot under
simple and mild conditions.