[C:1]([O:5][C:6]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[C:11](=[O:18])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:19][Mg]Br.CCOCC>C1COCC1>[C:1]([O:5][C:6]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[C:11]([OH:18])([CH3:19])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]To a solution of 1-tert-butyloxycarbonyl-1,2,3,4-tetrahydro-4-quinolinone (170 mg, 0.687 mmol) in THF (5 mL) at 0° C. was added 3.0 M methylmagnesium bromide in ether (688 mL, 2.1 mmol). The reaction mixture was stirred at 0° C. for 1 h then quenched with water (2 mL), extracted with ethyl acetate (2×10 mL), dried (Na2SO4) and the solvent was removed in vacuo to give an oil that was subjected to flash chromatography (silica gel, hexanes/ethyl acetate, 7:3) to afford 120 mg (66%) of 1-tert-butyloxycarbonyl-1,2,3,4-tetrahydro-4-hydroxy-4-methylquinoline. Data for 1-tert-butyloxycarbonyl-1,2,3,4-tetrahydro-4-hydroxy-4-methylquinoline: 1H NMR (400 MHz, DMSO-d6) 7.54 (d, J=7.7, 1H), 7.50 (dd, J=7.7, 1.5, 1H), 7.14 (ddd, J=7.3, 7.3, 1.7, 1H), 7.04 (ddd, J=7.9, 7.9, 1.0, 1H), 5.14 (s, 1H), 3.69 (m, 2H), 1.87 (t, J=6.5, 2H), 1.46 (s, 9H), 1.37 (s, 3H).
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