In summary, we have developed a one-pot O-sulfinative
Passerini/oxidation reaction, in which a combination of an
aldehyde, an isocyanide, and a sulfinic acid react, followed by
addition of mCPBA as an oxidant to give the corresponding α-
(sulfonyloxy)amides in high yields. This reaction is the first
reported demonstration of an isocyanide-based multicomponent
reaction using a sulfinic acid in place of a carboxylic acid. A
wide range of aldehydes and isocyanides are applicable to this
reaction.