α‐Arylation and Ring Expansion of Annulated Cyclobutanones: Stereoselective Synthesis of Functionalized Tetralones
作者:Stanley Chang、Michael Holmes、Jeffrey Mowat、Michael Meanwell、Robert Britton
DOI:10.1002/anie.201608449
日期:2017.1.16
α‐Arylcyclobutanones display unique reactivity that makes them valuable synthetic intermediates and target molecules. We describe the preparation of α‐aryl‐ and α‐heteroarylcyclobutanones through a direct α‐arylation reaction. Problematic fragmentations are avoided by the use of LiOtBu, which promotes a rapid but reversible self‐aldol reaction that slowly releases the enolate required for α‐arylation
α-芳基环丁酮显示出独特的反应活性,使其成为有价值的合成中间体和目标分子。我们描述了通过直接的α-芳基化反应制备α-芳基和α-杂芳基环丁酮的方法。通过使用LiO t Bu避免了有问题的碎片化,LiO t Bu可以促进快速但可逆的自我羟醛反应,从而缓慢释放α芳构化所需的烯醇化物。我们还展示了α-芳基环丁酮的环扩展,该过程在1-甲氧基硫代甲状腺素D的立体选择性合成中得到了突出显示。