An Efficient Synthesis of Racemic 4-Hydroxy-2-oxo-1-pyrrolidineacetamide (Oxiracetam) Using Tetramic-Acid Intermediates
作者:David D. P. Laffan、Markus Bänziger、Lauren Duc、Andrew R. Evans、John F. McGarrity、Thomas Meul
DOI:10.1002/hlca.19920750323
日期:1992.5.6
The title compund, 1a, has been synthesised in racemic form from ethyl (E)-4-chloro-3-ethoxybut-2-enoate in 43% overall yield in five steps. Several routes to the final product are described, but the most efficient involves hydrogenation of a C(5)-unsubstituted tetramic acid 5b. The instability of this class of compounds required the use of a catalyst which could operate under very acidic aqueous conditions