HCID 67139799, compound → HCID 67138409, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the title E compound, 2-(3-benzyloxy-4-nitro-benzyl)-2-t-butoxycarbonylamino-malonic acid dimethyl ester (6.98 g, 14.3 mmol) in DMSO (68 mL) and water (1.46 mL) sodium chloride (0.85 g, 14.6 mmol) is added and the mixture is gradually heated to 150° C. for 1 h. The mixture is cooled to RT, diluted with water (300 mL) and extracted 3 times with EtOAc. The organic extracts are washed with water and brine, dried over anhydrous MgSO4, decolorized with charcoal, filtered and evaporated. The residue is purified by chromatography (silica gel column, 6×30 cm, on EtOAc-hexane 1:1) to give 3-(3-Benzyloxy-4-nitro-phenyl)-2-tert-butyloxycarbonylamino-propionic acid methyl ester as a crystalline solid: mp=104-105° C.

Provenance & Evidence