Nitric Acid → 3-acetyl-7-nitro-2,3,4,5-tetrahydro-1H-benzo[d]azepine

Participants

Reaction Steps

To a cooled solution of HNO3 (70%) at 10° C., 3-acetyl-2,3,4,5-tetrahydro-1H-3-benzazepine (6.8 g, preparation reported in WO 02/40471) was added portionwise over 20 min. After addition mixture was allowed to warm at rt. and stirred for further 4 h. Mixture was poured into ice and pH adjusted to 11 using NaOH (conc) then was extracted with DCM. The organic layer was collected and the aqueous phase extracted twice with DCM. The combined DCM layers were concentrated to provide the target compound (7.74 g), which was used in further conversions without any purification.

Provenance & Evidence