An effective route to functionalized nicotinamide and isonicotinamide derivatives
is described. This involves the reaction of nicotinic or isonicotinic acid with acetylenic
compounds in the presence of alkyl isocyanides. The reactive 1:1 intermediates obtained
from the addition of alkyl isocyanides to dialkyl acetylenedicarboxylates or dibenzoylacetylene
was trapped by OH-acids such as nicotinic or isonicotinic acid to produce dialkyl
2-(alkylamino)-5-[alkyl(3- or 4-pyridylcarbonyl)amino]-3,4-furandicarboxylate, N
3-(alkyl)-N
3-[3,4-dibenzoyl-5-(alkylamino)-2-furyl]nicotinamide, and N
4-(alkyl)-N
4-[3,4-dibenzoyl-5-(alkylamino)-2-furyl]isonicotinamide derivatives.
alkyl isocyanide - dialkyl acetylenedicarboxylate - dibenzoylacetylene - nicotinic
acid - isonicotinic acid - multicomponent reaction - zwitterion - nicotinamide - isonicotinamide
- Dimroth-type rearrangement