Borane → 7-(2-Chlorobenzyl)-1,2,3,4,4a,5,6,7-octahydropyrazino[1,2-a][1,5]benzodiazepine

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To a solution of Example 1C (50 mg, 0.16 mmol) in N,N-dimethylformamide (1 mL) was added sodium hydride (65%, 6.98 mg, 0.19 mmol). The solution was allowed to stir at room temperature for 1 hour before addition of 1-(bromomethyl)-2-chlorobenzene (37.2 mg, 0.181 mmol). The reaction mixture was stirred overnight. The solution was concentrated. To the concentrate was added tetrahydrofuran (10 mL) followed by borane (1M in tetrahydrofuran, 1 mL, 1 mmol). The solution was heated in an 80° C. oil bath for 4 hours. Methanol (20 mL) was added and heating of the resultant solution was continued in the 80° C. bath for 1 hour before concentration. To the concentrate was added dichloromethane (10 mL), methanol (1 mL) and HCl (4M in dioxane, 2 mL) Once LC/MS analysis indicated the reaction was complete the solution was concentrated and purified by preparative HPLC to afford the title compound. 1H NMR (500 MHz, DMSO-d6/D2O) δ ppm 7.46 (d, J=8.85 Hz, 1H) 7.28-7.38 (m, 3H) 6.95 (dd, J=7.93, 1.53 Hz, 1H) 6.87-6.92 (m, 1H) 6.82-6.87 (m, 1H) 6.70 (dd, J=7.78, 1.37 Hz, 1H) 4.56 (d, J=16.17 Hz, 1H) 4.36 (d, J=16.48 Hz, 1H) 3.46-3.56 (m, 1H) 3.35-3.43 (m, 2H) 3.06-3.28 (m, 4H) 2.93-3.02 (m, 2H) 1.89-1.99 (m, 1H) 1.70-1.79 (m, 1H) MS (ESI) m/z 328.0 (M+H)+.

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