A. Bartels et al., STEREOSELECTIVE SYNTHESIS OF 4-SUBSTITUTED CIS-3-(ALPHA-HYDROXYETHYL)-PYRROLIDINE-2-ONES, Tetrahedron : asymmetry, 8(10), 1997, pp. 1545-1549
Michael-addition of nitromethane anion to 5-ylidene-1,3-dioxane-4-ones
2 gives high yields of 5-(beta-nitroalkyl)-1,3-dioxane-4-ones 3 and 4
with a preponderance of 3 (re-attack). Hydrogenation of the products
in the presence of Raney-Ni affords optically active 4-substituted cis
-3-(alpha-hydroxyethyl)-pyrrolidine-2-ones 6. (C) 1997 Elsevier Scienc
e Ltd.