1: With N-[(1R,2R)-2-amino-1,2-diphenylethyl]-N'-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-thiourea; 4-nitro-benzoic acid in tetrahydrofuran Michael Addition; 8 h; Reflux; 2: With sodium hydroxide in tetrahydrofuran T=20°C; Michael Addition; 1 h; optical yield given as percent deenantioselective reaction;