compounds and nitriles undergo a smooth tandem Prins–Ritter type cyclization in the presence of CeCl3·7H2O/AcCl at ambient temperature to produce 4-amido tetrahydropyrans in high yields with all cis-selectivity. Spirocyclic 4-amido tetrahydropyrans are obtained in the case of cyclic ketones.
在环境温度下,在CeCl 3 ·7H 2 O / AcCl存在下,均烯丙醇,羰基化合物和腈类进行顺式串联的Prins-Ritter型环化反应,以高收率和所有顺式选择性生成4-氨基四氢吡喃。在环状酮的情况下获得螺环的4-酰胺基四氢吡喃。
Three-component, one-pot diastereoselective synthesis of 4-amidotetrahydropyrans via the Prins–Ritter reaction sequence
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.