Methylamine → 2-{7-Chloro-4-[(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-6-yl)carbonyl]-3,4-dihydro-2H-1,4-benzoxazin-3-yl}-N-methylacetamide

Participants

Reaction Steps

A mixture of 2-(7-chloro-4-(3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-6-carbonyl)-3,4-dihydro-2H-benzo[b][1,4]oxazin-3-yl)acetic acid (Intermediate 22, 38 mg, 0.09 mmol), methanamine (0.236 mL, 0.47 mmol) (2 M solution in THF), and TEA (0.039 mL, 0.28 mmol) in EtOAc (2 mL) was treated with T3P (50 wt. % in EtOAc, 0.112 mL, 0.19 mmol) at rt. The reaction mixture was stirred at rt over night and concentrated. The crude product was purified by preparative HPLC (Kromasil C8 column (10 μm 250×20 ID mm), using a gradient of 20-60% ACN in H2O/ACN/FA 95/5/0.2 buffer, over 20 min with a flow of 19 mL/min, UV detection at 240 nm). Freeze-drying gave the title compound (24 mg, 61%) as a white powder.

Provenance & Evidence