An efficient synthesis of dialkyl 2-(alkylamino)-5,6-dioxo-4a,7-diphenyl-4,4a,5,6-tetrahydrocyclopenta[b]pyran-3,4-dicarboxylates from one-pot three-component reaction of the zwitterions generated from dialkyl acetylenedicarboxylates and alkyl isocyanides with 3,5-diphenylcyclopentane-1,2,4-trione is described.
DicksteinJ.I., and MillerS. I., The chemistry of functional groups. the chemistry of carbon-carbon triple bond, Part 2, PataiS., ed.; Wiley: Chichester, 1978; Chap. 19, p. 813.
6.
RamazaniA., KazemizadehA. R., AhmadiE., NoshiranzadehN., and SouldoziA., Curr. Org. Chem., 2008, 12, 59.
7.
NairV., DevipriyaS., and SureshE., Tetrahedron, 2008, 64, 3567.
8.
NairV., MenonR. S., SreekanthA. R., AbhilashN., and BijuA. T., Acc. Chem. Res., 2006, 39, 520.
