The ‘Aqueous’ Prins Cyclization: A Diastereoselective Synthesis of 4-Hydroxytetrahydropyran Derivatives
作者:Jhillu Yadav、Basi Subba Reddy、Gunda Narayana Kumar、Seema Aravind
DOI:10.1055/s-2007-1000932
日期:2008.2
Phosphomolybdic acid (H3PMo12O40, a heteropoly acid) is found to catalyze efficiently the Prins cyclization of homoallylic alcohols with aldehydes in water at room temperature to provide tetrahydropyran-4-ol derivatives in high yields with all cis-selectivity. Only cyclic ketones can give spirocyclic products. The use of phosphomolybdic acid in water makes this procedure simple, more convenient, cost-effective, and environmentally friendly.
研究发现,磷钼酸(H3PMo12O40,一种杂多酸)可在室温下高效催化同源烯丙基醇与醛在水中的普林斯环化反应,以高产率和全顺选择性提供四氢吡喃-4-醇衍生物。只有环酮才能生成螺环产物。在水中使用磷钼酸使这一过程变得简单、方便、经济和环保。