Stereoselective One-Pot, Three-Component Synthesis of 4-Amidotetrahydropyran
摘要:
[GRAPHICS]The reaction of aldehyde with allylsilane in acetonitrile mediated by boron trifluoride etherate generated 4-aminotetrahydropyrans in good yields. The product is highly stereoselective.
Three-component coupling of carbonyl compounds, homoallylic alcohols, and nitrites has been achieved using 20 mol % of phosphomolybdic acid (PMA) at ambient temperature via the Prins-Ritter sequence to furnish 4-amidotetrahydropyrans in high yields with all cis selectivity. Spirocyclic-4-amidotetrahydropyrans are obtained using cyclic ketones. (C) 2008 Elsevier Ltd. All rights reserved.