Dimethylformamide → Benzyl (2,4-difluoro-3-formylphenyl)carbamate

Participants

Reaction Conditions

Reaction Steps

In a round bottom flask (2,4-difluoro-phenyl)-carbamic acid benzyl ester (30, 3.83 g, 14.5 mmol) is combined with 148 mL of tetrahydrofuran. The solution is chilled to −78° C. and n-butyllithium (19.1 mL, 1.60 M in hexane, 30.0 mmol) is added over 30 minutes, followed by the addition of N,N-dimethylformamide (1.12 mL, 14.5 mol). The reaction mixture is allowed to warm to ambient temperature and is stirred overnight, then poured into water and extracted with ethyl acetate. The organic layer is washed with brine, dried over sodium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material is crystallized from ether to provide the desired compound (33, 3.0 g, 71%).

Provenance & Evidence