Synthesis and X-ray crystal structures of chiral, nonracemic 5,6-dihydro-4H-1,3,4-oxadiazines
作者:Shawn R. Hitchcock、Melissa A. Dean、Christopher J. Kelley、Kate L. Edler、Gregory M. Ferrence
DOI:10.1002/jhet.402
日期:——
A series of chiral, nonracemic oxadiazines have been prepared from (1R,2S)‐ephedrine, (1R,2S)‐norephedrine, and L‐phenylalaninol. The synthesis of the Ephedra‐based oxadiazines was accomplished by a process of N‐nitrosation, reduction, acylation, and acid‐catalyzed cyclization. The trans‐ and cis‐diastereomeric oxadiazines derivedfrom (1R,2S)‐ephedrine were analyzed by 1H NMR spectroscopy and by single