Highly Regio- and Diastereoselective Phosphine-Catalyzed [2 + 4] Annulation of Benzofuran-Derived Azadienes with Allyl Carbonates: Access to Spiro[benzofuran-cyclohexanes]
Yifei Huang, Mengting Tan, Nengzhong Wang, Yufei Zhang, Hui Yao, Xiao Xiao, Nianyu Huang, Kun Zou
Abstract
A novel highly regio- and diastereoselective phosphine-catalyzed [2 + 4] annulation of benzofuran-derived azadienes (BDAs) with acidic hydrogen-tethered allyl carbonates has been developed ingeniously. A range of functionalized spiro[benzofuran-cyclohexane] derivatives with two consecutive stereocenters were smoothly obtained in moderate to excellent yields under mild reaction conditions from readily available materials. Moreover, this method is a practical and scalable strategy that creates the core structural motif of the fungistatic drug, griseofulvin.
Topics & Concepts
BenzofuranAnnulationChemistryPhosphineStereocenterCatalysisCyclohexaneCyclohexanesCombinatorial chemistryOrganic chemistryMedicinal chemistryStereochemistryEnantioselective synthesisAdvanced Synthetic Organic ChemistryAsymmetric Synthesis and CatalysisSynthesis and Biological Activity