Can a Ketone Be More Reactive than an Aldehyde? Catalytic Asymmetric Synthesis of Substituted Tetrahydrofurans
作者:Sunggi Lee、Han Yong Bae、Benjamin List
DOI:10.1002/anie.201806312
日期:2018.9.10
O‐heterocycles bearing tetrasubstituted stereogenic centers are prepared via catalytic chemo‐ and enantioselective nucleophilic additions to ketoaldehydes, in which the ketone reacts preferentially over the aldehyde. Five‐ and six‐membered rings with both aromatic and aliphatic substituents, as well as an alkynyl substituent, are obtained. Moreover, 2,2,5‐trisubstituted and 2,2,5,5‐tetrasubstituted
带有四取代立体异构中心的O杂环是通过催化化学和对映选择性亲核性加成至酮醛而制备的,其中酮优先于醛反应。获得具有芳族和脂族取代基以及炔基取代基的五元和六元环。此外,合成的2,2,5-三取代和2,2,5,5-四取代的四氢呋喃具有出色的立体选择性。此外,脱水harringtonine侧链的三步合成证明了上述方法的合成效用。