反应详情

Into a 25 mL round bottom flask was added methyl 1-((6-hydroxyquinazolin-2-yl)methyl)piperidine-4-carboxylate (0.5 g, 1.6 mmol), cis-4-tert-butylcyclohexanol (0.38 g, 0.24 mmol, 1.5 eq), PPh3 (0.87 g, 3.3 mmol, 2 eq) and dry THF (0.5 mL) under N2 atmosphere. Then DIAD (0.53 g, 0.33 mmol, 2 eq) was quickly added in one portion at room temperature. The reaction mixture was stirred at rt for 0.5 h, diluted with water (20 mL) and extracted with DCM (20 ml*3). The combined organic lays were dried over MgSO4 and concentrated. The residue was purified by prep-TLC (DCM/MeOH=15/1) to give methyl 1-((6-(trans-4-tert-butylcyclohexyloxy)quinazolin-2-yl)methyl)piperidine-4-carboxylate (300 mg, yield: 20%) as brown oil. 1HNMR (400 MHz, CDCl3) δ: 9.27 (s, 1H), 7.87 (d, J=8.8 Hz, 1H), 7.45 (dd, J=8.8, 2.8 Hz, 1H), 7.07 (d, J=2.8 Hz, 1H), 4.30˜4.20 (m, 1H), 3.94 (s, 2H), 3.59 (s, 3H), 3.00˜2.98 (m, 2H), 2.28˜2.18 (m, 4H), 1.85-1.82 (m, 6H), 1.40˜1.34 (m, 2H), 1.18˜1.03 (m, 4H), 0.86 (s, 9H); ESI-MS: m/z 440.1 (M+1)+.

1. extractionextracted with DCM (20 ml*3)
2. dry with materialThe combined organic lays were dried over MgSO4
3. concentrationconcentrated
4. customThe residue was purified by prep-TLC (DCM/MeOH=15/1)