Conformational Studies of <i>N</i><sub>3</sub>-Substituted [1,3,4]-Oxadiazinan-2-ones
作者:David M. Casper、Jennifer R. Blackburn、Christopher D. Maroules、Tana Brady、Joel M. Esken、Gregory M. Ferrence、Jean M. Standard、Shawn R. Hitchcock
DOI:10.1021/jo020322g
日期:2002.12.1
conformational changes that are observable by (13)C NMR spectroscopy. The conformational properties of new [1,3,4]-oxadiazinan-2-one derivatives 2d-k are examined by X-ray crystallography and variable-temperature (13)C NMR spectroscopy and further evaluated by semiempirical AM1 calculations. The collected data reveal that the conformational changes of the overall ring system are dependent upon the stereoelectronic
已知在N(3)位置被乙酰基(2a),丙酰基(2b)或苯乙酰基(2c)取代基酰化的基于伪麻黄碱的[1,3,4]-恶二嗪烷-2-酮通过(13)C NMR光谱可观察到。通过X射线晶体学和可变温度(13)C NMR光谱检查了新的[1,3,4]-恶二嗪烷-2-酮衍生物2d-k的构象性质,并通过半经验AM1计算对其进行了评估。收集的数据表明,整个环系统的构象变化取决于N(3)取代基的立体电子因子。