To a solution of (R)-3-chloro-N-[1-(7-chloro-4-oxo-3-phenylamino-3,4-dihydro-quinazolin-2-yl)-but-3-ynyl]-N-[3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-propyl]-2-fluoro-benzamide (1.13 g, 1.65 mmol) in methanol (10 ml) and the solution was purged with N2. To this solution was added hydrazine (110 μl). The mixture was then stirred at room temperature and the reaction progress was monitored by HPLC/MS. The reaction mixture was then filtered and solvent was removed from the filtrate. The residue was purified by flash column to afford N-(3-amino-propyl)-3-chloro-N-[(R)-1-(7-chloro-4-oxo-3-phenylamino-3,4-dihydro-quinazolin-2-yl)-but-3-ynyl]-2-fluoro-benzamide (708 mg, 91%) as off-white solid, M.p. 101-103° C. LCMS: m/e 552 [M+H]. 1H NMR (CDCl3): δ 8.13 (d, J=8.8 Hz, 1H), 7.83 (s, 1H), 7.45 (dd, J=4.8 and 2.0 Hz, 1H), 7.32 (m, 1H), 7.22 (t, J=8.0 Hz, 1H), 7.15 (t, J=8.0 Hz, 1H), 7.05 (t, J=8.0 Hz, 1H), 6.95 (m, 1H), 6.84 (t, J=7.2 Hz, 1H), 6.72 (d, J=7.2 Hz, 1H), 6.48 (d, J=7.2 Hz 1H), 3.62 (m, 1H), 3.48 (m, 1H), 3.28 (br, 1H), 3.14 (m, 1H), 3.02 (br, 1H), 2.59 (m, 2H), 2.30 (br, 1H), 2.02 (t, 2.4 Hz, 1H), 1.36 (m, 2H).
