Access to a Diverse Array of Bridged Benzo[1,5]oxazocine and Benzo[1,4]diazepine Structures
作者:Grant J. Sherborne、Coura Diène、Paul Kemmitt、Andrew D. Smith
DOI:10.1021/acs.orglett.3c03392
日期:2023.12.8
The preparation of bridged benzo[1,5]oxazocines and benzo[1,4]diazepines is demonstrated from simple aniline and aldehyde starting materials. A one-pot condensation/6π electrocyclization is followed by an intramolecular trapping of the 2,3-dihydroquinoline intermediate by nitrogen or oxygen nucleophiles to give bridged seven- and eight-membered products. Using 3-hydroxypyridinecarboxaldehydes results
证明了用简单的苯胺和醛起始原料制备桥联苯并[1,5]恶唑辛和苯并[1,4]二氮杂卓。一锅缩合/6π电环化之后,2,3-二氢喹啉中间体被氮或氧亲核试剂分子内捕获,得到桥联的七元和八元产物。使用 3-羟基吡啶甲醛可产生稳定的两性离子结构,该结构可以在氢化条件下进行非对映选择性还原。 2-吡啶基取代的1,2,3,4-四氢喹啉也证明了具有优异非对映选择性的类似环化/氢化途径。