Oxazine formation by MsCl/Et3N as a convenient tool for the stereochemical interconversion of the hydroxyl group in N-acetyl 1,3-aminoalcohols. Asymmetric synthesis of N-acetyl l-xylo- and l-arabino-phytosphingosines
作者:Om V. Singh、Dorothy J. Kampf、Hyunsoo Han
DOI:10.1016/j.tetlet.2004.08.030
日期:2004.9
Use of MsCl/Et3N was proven to provide a convenient synthetic tool for the stereochemical intercoversion of the hydroxyl group in N-acetyl 1,3-aminoalcohols. Thus, under these conditions, the alcohols 4 and 6 smoothly converted to the oxazines 5 and 7, respectively, which were hydrolyzed to generate the corresponding inverted alcohols 6 and 4 in one pot. Further elaboration of 4 and 6 led to the efficient asymmetric synthesis of N-acetyl L-xylo- and L-arabino-phytosphingosines (11 and 15), respectively, via olefin cross metathesis reactions. (C) 2004 Published by Elsevier Ltd.