Diastereoselective synthesis of chroman bearing spirobenzofuranone scaffolds oxa-Michael/1,6-conjugated addition of -quinone methides with benzofuranone-type olefins.

A simple and convenient cyclization of -hydroxyphenyl-substituted -quinone methides with benzofuran-2-one type active olefins oxa-Michael/1,6-conjugated addition has been developed, which afforded an easy access to enriched functionalized chroman-spirobenzofuran-2-one scaffolds with good to excellent yields (up to 90%) and diastereoselectivities (up to >19 : 1 dr). This reaction provided an efficient method for constructing desired spirocyclic compounds combining both well-known heterocyclic pharmacophores chroman and benzofuran-2-one.