A1,3-strain mediated epimerization of 2e,3e,5e,6e-tetraarylpiperidin-4-one oximes
作者:M. Srinivasan、S. Perumal、S. Selvaraj
DOI:10.1002/mrc.1480
日期:2004.12
and tetraarylpiperidin‐4‐one oximes were synthesized from 2e,3e,6e‐tri‐ and 2e,3e,5e,6e‐tetraarylpiperidin‐4‐ones, respectively. In the case of the latter compounds, oximation is accompanied by epimerization at C‐5 to avoid the A1,3‐strain between the oxime OH group and the 5e‐aryl ring of the initially formed oxime resulting in 2e,3e,5a,6e‐tetraarylpiperidin‐4‐one oximes. 1H, 13C and 2D NMR spectroscopic
分别由 2e,3e,6e-tri- 和 2e,3e,5e,6e-tetraarylpiperidin-4-ones 合成了一系列三-和四芳基哌啶-4-one 肟。在后一种化合物的情况下,肟化伴随着 C-5 的差向异构化,以避免肟 OH 基团和最初形成的肟的 5e-芳环之间的 A1,3-应变,导致 2e,3e,5a,6e -四芳基哌啶-4-酮肟。1H、13C 和 2D NMR 光谱数据用于表征和研究这些化合物的立体化学。版权所有 © 2004 John Wiley & Sons, Ltd.