Variants of the Prins Cyclization for the Synthesis of Terpenoid Spiroethers and Oxabicyclo[3.3.1]Nonane Derivatives

Formal [5+1] annulation reactions of dielectrophilic peroxides: facile access to functionalized dihydropyrans

Peroxides, functioning as unique five-atom bielectrophilic synthons, enable the new [5+1] annulation reactions to access dihydropyrans in high yields.

Iron-catalyzed domino Knoevenagel-hetero-Diels-Alder reaction: facile access to oxabicyclo[3.3.1]nonene derivatives

A Fe-catalyzed domino Knoevenagel-hetero-Diels-Alder reaction of alkenyl aldehydes and 1,3-diketones has been developed. It provides straightforward access to a series of oxabicyclo[3.3.1]nonene derivatives in promising yields with excellent diastereoselectivity and functional group tolerance. The resultant bridged dihydropyrans can be smoothly converted into chromene derivatives, thus highlighting the synthetic utility of this method.

Ring strain-dictated divergent fluorinating Prins cyclization or semipinacol rearrangement

We have developed ring-strain dictated divergent diastereoselective fluorinating Prins cyclizations or semipinacol rearrangements to access a range of tetrahydropyran derivatives.