Triphenylphosphine → (S)-tert-butyl 3-(4-(3-(3-(5-tert-butylisoxazol-3-yl)ureido)phenoxy)-6-methoxyquinazolin-7-yloxy)pyrrolidine-1-carboxylate

Participants

Reaction Steps

To a suspension of 1-(5-tert-butylisoxazol-3-yl)-3-[3-(7-hydroxy-6-methoxyquinazolin-4-yloxy)phenyl]urea from Example 95B (0.45 g, 1 mmol), (S)-tert-butyl 3-hydroxypyrrolidine-1-carboxylate (0.225 g, 1.2 mmol), and Ph3P (0.393 g, 1.5 mmol) in THF (10 mL) was added di t-butyl azodicarboxylate (0.345 g, 1.5 mmol). After it was stirred at room temperature overnight, it was quenched with saturated NaHCO3 solution and extracted with CH2Cl2. Extracts were dried over MgSO4 and concentrated under reduced pressure. It was purified by silica gel chromatography with 70-90% EtOAc/hexane as eluants to afford (S)-tert-butyl 3-(4-{3-[3-(5-tert-Butylisoxazol-3-yl)ureido]phenoxy}-6-methoxyquinazolin-7-yloxy)pyrrolidine-1-carboxylate as solid (0.609 g, 98%). 1H NMR (300 MHz, CDCl3) δ 9.4 (s, 1H), 8.8 (s, 1H), 8.61 (s, 1H), 7.67 (m, 1H), 7.50 (m, 2H), 7.34 (t, 1H), 7.31 (m, 1H), 6.96 (d, 1H), 6.13 (s, 1H), 5.12 (m, 1H), 4.06 (s, 3H), 3.61-3.80 (m, 4H), 2.34 (m, 2H), 1.47 (s, 9H), 1.31 (s, 9H); LC-MS (ESI) m/z 619 (M+H)+.

Provenance & Evidence