The Mukaiyama aldol-Prins (MAP) cyclization with ketones is described. These reactions produce substituted tetrahydropyrans efficiently and in some cases with high stereoselectivity. Cyclizations with E- and Z-alkenes are shown to be stereospecific. These studies extend the scope of the MAP cyclizations promoted by titanium tetrabromide.
Mukaiyama aldol-Prins (
MAP)环化与酮的反应被描述。这些反应高效地生成取代的
四氢吡喃,并且在某些情况下具有高度的立体选择性。与E-和Z-烯烃的环化被证明是立体专一的。这些研究扩展了四
溴化
钛促进的
MAP环化的应用范围。