Control of Proton Transfer: Intramolecular vs Intermolecular<sup>1</sup><sup>,</sup><sup>2</sup>
作者:Howard E. Zimmerman、Jie Cheng
DOI:10.1021/ol0506617
日期:2005.6.1
[reaction: see text] Proton transfer in ketonization of enolates is a critical step in a myriad of organic reactions. Its stereochemistry has been the object of our studies since we reported kinetic protonation from the less hindered face of the molecule under kinetic control some decades ago. Very recently, we have succeeded in reversing the stereochemistry using 2-pyridyl groups to deliver the proton