title: Transpositive Tandem Annulation of Phthalides with Allene Carboxylates: Regioselective Synthesis of Arylnaphthalene Lignans.
abstract: Allene carboxylates, scarcely used as Michael acceptors, serve as acceptors in the annulation with phthalides in the presence of LDA and provide a one-pot synthesis of naphtho[c]furanones in very good yields. This tandem annulation is proposed to proceed via transposition of the hydroxy group resulting from the initial annulation.
authors: Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, India.
authors: Dipakranjan
authors: D
authors: Mal
authors: Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, India.
authors: Supriti
authors: S
authors: Jana