A versatile and practical method for regioselective synthesis of polysubstituted furanonaphthoquinones

An efficient and attractive synthesis of a series of novel poly-functionalized phosphorus zwitterions was achieved via three-component reactions of the corresponding functional nucleophiles, aldehydes, and Bu ₃P in the presence of acidic promoter. These polysubstituted zwitterions could regioselectively undergo further transformations to synthetically important furanonaphthoquinones and related products via the intramolecular Wittig reaction. These methods could have potential application in synthetic and pharmaceutical chemistry for its facilitation and easily accessible commercial materials.