Hydrochloric Acid → 8-Chloro-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepine

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Reaction Steps

(3-Chloro-7,8-dihydro-6H-5-oxa-9-aza-benzocyclohepten-9-yl)-phenyl-methanone from Example E25.2 (783 mg, 2.7 mmol) was dissolved in dioxan (10 ml) and 6M HCl aqueous solution (50 ml) was added. The mixture was heated at reflux for 20 h then concentrated in vacuo and azeotroped with toluene. The residue was dissolved in diethyl ether and water, basified with NaHCO3 and the layers were partitioned. The organic layer was washed with brine, dried and concentrated in vacuo to yield the title compound (280 mg, 47%).

Provenance & Evidence