Diisopropylethylamine → Benzyl-N-{4-[(4,5-dihydrobenzo[2,3]oxepino[4,5-d][1,3]-thiazol-2-ylamino)methyl]cyclohexyl}-carbamate

A solution containing benzyl N-(4-{[(aminocarbothioyl)amino]methyl}-cyclohexyl)carbamate (3.45 g, 10.73 mmol), 4-bromo-2,3,4,5-tetrahydro-1-benzoxepin-5-one (2.60 g, 10.78 mmol), diisopropylethylamine (2.50 ml) and EtOH (50 ml) was heated at reflux for 4 hours. The solvent was removed and the residue was chromatographed on silica-gel eluting with 1:3 EtOAc/Hexane to yield 65% (3.2 g) of the product as a white solid: m.p. 124-127° C.; 1H-NMR (CDCl3) δ 1.09 (4H, pentet, J=10.4 Hz), 1.55 (1H, broad), 1.83 (2H, m), 2.04 (2H, broad), 3.10 (2H, t, J=6.2 Hz), 3.15 (2H, t, J=5.2 Hz), 3.43 (1H, broad) 4.33 (2H, t, J=5.2 Hz), 4.62 (1H, d, J=8.0 Hz), 5.08 (2H, s), 5.31 (1H, m), 7.00 (1H, dd, J=1.2 Hz, 7.8 Hz), 7.12 (2H, m), 7.35 (5H, s), 8.25 (1H, dd, J=1.7 Hz, 7.8 Hz); 464 (ESMS, MH+).