Enantiodivergent Transannular Rearrangement of 3-Isopropyl-1,4-benzodiazepine-2,5-dione by Memory of Chirality
作者:Daniel Farran、Pierre Archirel、Loïc Toupet、Jean Martinez、Georges Dewynter
DOI:10.1002/ejoc.201100030
日期:2011.4
An unprecedented reactivity has been introduced to 3-isopropyl-1,4-benzodiazepine-2,5-dione thanks to N-Boc activation. Under basic conditions, a transannular rearrangement occurred by ring contraction to furnish a 3-aminoquinoline-2,4-dione with good to excellent enantiomeric purity. Depending on the nature of the base, either enantiomer can be obtained in a stereocontrolled manner. This enantiodivergent
由于 N-Boc 活化,3-isopropyl-1,4-benzodiazepine-2,5-dione 被引入了前所未有的反应性。在碱性条件下,通过环收缩发生跨环重排以提供具有良好至优异对映体纯度的 3-氨基喹啉-2,4-二酮。根据碱的性质,可以以立体控制的方式获得任一对映异构体。这种对映发散合成可以归因于起始材料的构象平衡,这在 DFT 计算的帮助下进行了研究。