Benzoyl chloride → Tert-butyl 1-benzoyl-4-{[4-(2-butynyloxy)phenyl]sulfonyl}-1,4-diazepane-5-carboxylate

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Reaction Steps

tert-Butyl 4-{[4-(2-butynyloxy)phenyl]sulfonyl)-1,4-diazepane-5-carboxylate (0.425 g, 0.96 mmol) in dichloromethane at 25° C. (10 mL) was treated with triethylamine (0.28 mL, 2.02 mmol) followed by benzoyl chloride (0.12 mL, 1.06 mmol) and dimethylaminopyridine (10 mg). After 18 hours aqueous workup gave tert-butyl 1-benzoyl-4-{[4-(2-butynyloxy)phenyl]sulfonyl}-1,4-diazepane-5-carboxylate. 1H NMR (dmso-d6, 300 MH): 1.24 (s, 9H, t-bu), 1.82(s, 3H, CH3 ), 2.0-4.0 (m, 81, CH2 ), 4.65 (s, 1H, CM, 4.85 (s. 21H, CH2 ), 7.0-7.9 (m, 9H, ArH). Treatment with trifluoroacetic acid (4 mL) in dichoromethane (10 mL) for 6hours gave, after concentration in vacuo followed by chromatography on silica gel eluting with dichloromethane/methanol, 1-benzoyl4-{[4-(2-butynyloxy)phenyl]sulfonyl}-1,4-diazepane-5-carboxylic acid as a foam (0.328 g).

Provenance & Evidence