Synthesis and Conformational Dynamics of Tricyclic Pyridones Containing a Fused Seven-Membered Ring
作者:Karl R. Gibson、Laure Hitzel、Russell J. Mortishire-Smith、Ute Gerhard、Richard A. Jelley、Austin J. Reeve、Michael Rowley、Alan Nadin、Andrew P. Owens
DOI:10.1021/jo026411a
日期:2002.12.1
A new synthetic approach to tricyclic pyridones bearing a fused seven-membered ring is described. These compounds exhibit atropisomerism and exist in enantiomeric forms. Chiral HPLC separation of the enantiomers has allowed the rates of racemization to be measured and hence the free energy barrier for flipping the seven-membered ring to be deduced. Introduction of a further element of planar chirality
描述了一种新的合成方法,用于合成带有稠合七元环的三环吡啶酮。这些化合物表现出阻转异构性,并以对映体形式存在。对映异构体的手性HPLC分离可以测量外消旋的速率,因此可以推导翻转七元环的自由能垒。引入平面手性的另一元素导致非对映异构的阻转异构。非对映异构体的相互转化率已通过2D EXSY NMR光谱进行了定量,从而可以完整描述系统的构象动力学。