Dimethyl Sulfoxide → 5-(2-Methoxyethyl)-2-nitro-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine

Participants

Reaction Conditions

Reaction Steps

A microwave vial equipped with a magnetic stirrer was charged with 296c (2.67 g, 10.0 mmol), 2-methoxyethanamine (2.25 g, 30.0 mmol), and DMSO (14 mL). The reaction mixture was heated at 120° C. under microwave irradiation for 1.0 h. It was cooled to room temperature and diluted with ethyl acetate (40 mL). The mixture was washed with water (3×15 mL). The organic layer was dried and filtered. The filtrate was concentrated under pressure and the residual was purified by silica-gel column chromatography eluting with 30:1 dichloromethane/methanol to afford 296d (1.7 g, 75%) as a yellow solid. MS-ESI: [M+H]+ 227.0

Provenance & Evidence