“…Tetrahydropyrans (THPs), six-membered oxygen-containing heterocyclic compounds, represent a privileged structural scaffold in natural products and medicinally relevant molecules, 1 and the biological activities of α-substituted THPs also are undoubtedly confirmed, as exemplified by (+)-centrolobine, 2 (−)-diospongin B, 2 b ,3 and (−)- cis -rose oxide 4 (Scheme 1A). A number of synthetic methods of α-substituted THPs are currently available 5 due to the prevalence of such scaffolds.…”