Lewis Acid Catalyzed [4 + 2] Cycloaddition of <i>N</i>-Tosylhydrazones with <i>ortho</i>-Quinone Methides
作者:Chun-Ying Wang、Jia-Bin Han、Long Wang、Xiang-Ying Tang
DOI:10.1021/acs.joc.9b02040
日期:2019.11.1
A formal [4 + 2] cycloaddition of N-tosylhydrazones with ortho-quinone methides was developed, affording the facile synthesis of diverse 1,3-oxazine derivatives under mild conditions. In this transformation, N-tosylhydrazones are used as a 1,2-dipole synthon under base-free conditions. Moreover, the substrate scope is broad, and the products are formed with high diastereoselectivities in most of the
开发了N-甲苯磺酰azo与邻醌甲基化物的正式[4 + 2]环加成反应,可在温和条件下轻松合成各种1,3-恶嗪衍生物。在该转化中,在无碱条件下,将N-甲苯磺酰nes用作1,2-偶极合成子。此外,底物范围广,并且在大多数情况下以高非对映选择性形成产物。