Highly Selective Synthesis of Dihydrobenzo[<i>d</i>]isoxazoles and Dihydrobenzo[<i>d</i>]oxazoles from Oximes and Arynes via in Situ Generation of Nitrones
作者:Tuanli Yao、Beige Ren、Bo Wang、Yanna Zhao
DOI:10.1021/acs.orglett.7b01260
日期:2017.6.16
An efficient method for the synthesis of dihydrobenzo[d]isoxazoles and dihydrobenzo[d]oxazoles bearing a quaternary carbon center has been developed. The reaction involves generation of a ketonitrone intermediate in situ from a ketoxime and an aryne. A novel thermal rearrangement of the dihydrobenzo[d]isoxazole products to the corresponding dihydrobenzo[d]oxazoles has been observed. These transformations
开发了一种有效的合成带有季碳中心的二氢苯并[ d ]异恶唑和二氢苯并[ d ]恶唑的方法。该反应涉及由酮肟和芳烃原位产生酮硝基中间体。已经观察到二氢苯并[ d ]异恶唑产物向相应的二氢苯并[ d ]恶唑的新颖的热重排。这些转变可耐受多种官能团,并在无过渡金属的条件下为各种二氢苯并[ d ]异恶唑和二氢苯并[ d ]恶唑提供了快速有效的方法。