Photochemistry of 9-methylbicyclo[3.3.1]nonyl aryl ketones A novel 1,5-disproportionation of 1,4-hydroxy biradicals and asymmetric induction using the solid-state ionic chiral auxiliary method
作者:Shuang Chen、Brian O Patrick、John R Scheffer
DOI:10.1139/v05-147
日期:2005.9.1
5-disproportionation reaction has been discovered for 1,4-hydroxy biradicals derived from the photolysis of 9-methylbicyclo[3.3.1]nonyl phenyl ketones (1), which undergo mainly Yang cyclization both in solution and the solid state. By applying the solid-state ionic chiral auxiliary method of asymmetric synthesis to the Yang cyclization, enantiomeric excesses as high as 95% were achieved at high reaction
9-甲基双环[3.3.1]壬基苯基酮 (1) 的光解产生的 1,4-羟基双自由基发现了一种新的 1,5-歧化反应,该反应主要在溶液和固态中进行阳环化. 通过将不对称合成的固态离子手性辅助方法应用于阳环化,在高反应转化率下实现了高达 95% 的对映体过量。在 X 射线晶体学的帮助下讨论了反应选择性的起源。此外,发现酮1b的固态光反应以单晶到单晶的方式发生。 关键词:光化学,1,4-羟基双自由基,歧化,不对称诱导,离子手性助剂,单晶-为单晶反应。