Stability of electron deficient activated nitronates under neutral and Lewis acid catalyzed conditions. Facile nitronate cycloaddition reactions to the magnesium alkoxides of allylic alcohols leading to isoxazolidines and isoxazolines
作者:Shuji Kanemasa、Shinsuke Kaga、Eiji Wada
DOI:10.1016/s0040-4039(98)01902-9
日期:1998.11
exceptionally high reactivity to the magnesium alkoxides of allylic alcohols. Isoxazolidines or isoxazolines are formed as cycloadducts, depending upon the substitution pattern of the allylic alcohols. When the latter C-monosubstituted nitronate is treated with a catalytic amount of borontrifluoride etherate, the corresponding nitrile oxide is smoothly generated through β-elimination of methanol.
Asymmetrical unbridged nitrogen 16. The optically active N-alkoxyisoxazolidines and the structure of the tetraamide of 2-methoxyisoxazolidine-3,3,5,5-tetracarboxylic acid
作者:V. F. Rudchenko、O. A. D'yachenko、I. I. Chervin、A. B. Zolotoi、L. O. Atovmyan、R. G. Kostyanovskii