Phosphine-mediated reaction of 3-methyl allenoate and isatins: a protocol for the synthesis of spirofuran oxindoles.

A facile synthesis of spirofuran oxindoles via phosphine-mediated reaction of 3-alkyl allenoate with isatins is presented.

N-heterocyclic carbene catalyzed annulation of enals to aurone analogs: synthesis of cyclopentene-fused spirobenzofuran-3-ones.

A nucleophilic heterocyclic carbene mediated homoenolate annulation of enals to aurone analogs leading to the efficient synthesis of cyclopentene-fused spirobenzofuran-3-ones is reported.

A novel intramolecular homoenolate annulation leading to the formation of cyclopentene-fused macrocycles.

A nucleophilic heterocyclic carbene-mediated intramolecular homoenolate reaction strategy for the efficient synthesis of cyclopentene-fused macrocycles is reported.

Phosphine-mediated reaction of 3-alkyl allenoates and diaryl 1,2-diones: efficient diastereoselective synthesis of fully substituted cyclopentenones.

An efficient phosphine-mediated diastereoselective synthesis of substituted cyclopentenones from 3-alkyl allenoates and diaryl 1,2-diones is described.

A cascade reaction actuated by nucleophilic heterocyclic carbene catalyzed intramolecular addition of enals via homoenolate to α,ß-unsaturated esters: efficient synthesis of coumarin derivatives.

A nucleophilic heterocyclic carbene mediated intramolecular homoenolate reaction strategy for the efficient synthesis of 4-alkyl substituted coumarins is described.

A novel NHC-catalyzed transformation of 2H-chromene-3-carboxaldehydes to 3-methyl-2H-chromen-2-ones.

An unexpected transformation of 2H-chromene-3-carboxaldehydes to coumarin derivatives, mediated by NHC, is reported.