H. Takaya et al., Rhodium complex-catalyzed reaction of isonitriles with carbonyl compounds:Catalytic synthesis of pyrroles, ORG LETT, 3(3), 2001, pp. 421-424
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Low-valent rhodium complexes are efficient catalysts for the activation of
alpha -C-H bond of isonitriles. Addition of isonitriles to carbonyl compoun
ds proceeds under mild and neutral conditions to give the corresponding alp
ha,beta -unsaturated formamides. Catalytic synthesis of pyrroles can be per
formed by cyclocondensation of isonitriles with 1,3-dicarbonyl compounds.