Novel tocopheryl compounds. Part 16: Nitration of α-tocopheryl acetate—a mechanistic study
作者:Christian Adelwöhrer、Thomas Rosenau、Paul Kosma
DOI:10.1016/j.tet.2003.08.030
日期:2003.10
The reaction of alpha-tocopheryl acetate (vitamin E acetate, 3) with concentrated nitric acid proceeds according to a non-radical, two-step mechanism, producing 5-nitromethyl-gamma-tocopheryl acetate (4) in good yields. In the first step, oxidation of 3 affords a benzylic cation intermediate (8), which in the second step adds nitrite to give 4. The acetyl group, which stabilizes intermediate 8 intramolecularly, remains bound to the tocopheryl moiety throughout the reaction. (C) 2003 Elsevier Ltd. All rights reserved.