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Access to Multisubstituted Furan-3-carbothioates via Cascade Annulation of α-Oxo Ketene Dithioacetals with Isoindoline-1,3-dione-Derived Propargyl Alcohols.
J Org Chem ; 83(15): 7648-7658, 2018 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-29799747
A Brønsted acid-promoted, unprecedented formal (3 + 2) annulation strategy for the synthesis of multisubstituted furan-3-carbothioates is reported. This transformation represents the first regioselective annulation of α-oxo ketene dithio-acetals as 1,3-bis-nucleophiles in a cascade manner. The choice of isoindoline-1,3-dione-derived propargyl alcohols is crucial to the uncommon annulation mode between an alkyne-type bis-electrophile and a 1,3-bis-nucleophile under metal-free conditions. The scale-up of the synthesis and several interesting transformations of an as-synthesized product were further investigated. A Nazarov-like cyclization is proposed for the ring-closure process according to the experimental observations.





Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Org Chem Ano de publicação: 2018 Tipo de documento: Artigo