ethyl 2,2-dicarbonochloridoylcyclopropane-1-carboxylate

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 2,2-bis(chlorocarbonyl)cyclopropanecarboxylate (2 g, crude product from last step) in dichloromethane (10 mL) was added dropwise to a solution of N1-(4-chlorophenyl)benzene-1,2-diamine (2.2 g, 10 mmol) in toluene (50 mL) and the resulting mixture was heated to 100° C. for 48 h. The solvent was evaporated and the residue was purified by CombiFlash (PE:EA=5:1) to obtained ethyl 1-(4-chlorophenyl)-2,4-dioxo-1,2,4,5-tetrahydrospiro[benzo[b][1,4]diazepine-3,1′-cyclopropane]-2′-carboxylate (500 mg, 13%). LRMS (M+H)+: 384 m/z. 1H NMR (300 MHz, CDCl3): δ 1.07-1.12 (t, J=7.2 Hz, 3H), 1.72-1.81 (m, 1H), 2.16-2.18 (m, 1H), 2.41-2.43 (br, 1H), 3.92-4.00 (m, 2H), 7.20-7.25 (m, 1H), 7.42-7.49 (m, 4H), 7.52-7.65 (m, 3H), 8.06-8.08 (m, 1H). The solvent was evaporated the residue was purified by CombiFlash (PE:EA=5:1)