3-(3-chloro-propyl)-6-nitro-3H-benzoxazol-2-one → 3-Nitro-7,8-dihydro-6H-5-oxa-9-aza-benzocycloheptene-9-carboxylic acid isopropyl ester

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3-Nitro-7,8-dihydro-6H-5-oxa-9-aza-benzocycloheptene-9-carboxylic acid isopropyl ester was prepared from 3-(3-chloro-propyl)-6-nitro-3H-benzoxazol-2-one and isopropyl alcohol in an analogous manner to Example 1426a. Product isolated as a yellow oil (413 mg, 63%). LCMS (m/e) 281 (M+H); 1H-NMR (CDCl3, 400 MHz) δ 7.89-7.81 (m, 2H), 7.55-7.35 (m, 1H), 5.10-4.96 (m, 1H), 4.24 (t, 2H, J=5.5 Hz), 3.85 (t, 2H, J=5.6 Hz), 2.20-2.09 (m, 2H), 1.27 (d, 6H, J=5.7 Hz).

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