(4-Chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinolin-6-yl)(2,4-dimethyloxazol-5-yl)methanone → 1-(4-Chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinolin-6-yl)-1-(2,4-dimethyloxazol-5-yl)ethanol

Participants

Reaction Conditions

Reaction Steps

To a flask containing (4-chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinolin-6-yl)(2,4-dimethyloxazol-5-yl)methanone (0.225 g, 0.474 mmol, Intermediate 11: step b) was added THF (15 mL). The solution was cooled to −78° C. and MeLi (1.6 M in Et2O, 0.36 mL, 0.58 mmol) was introduced which resulted in an immediate light orange homogeneous mixture. After 35 minutes the reaction mixture was quenched with aqueous NH4Cl solution. The aqueous portion was extracted with EtOAc (4×30 mL) and the combined organics were washed with brine, dried over MgSO4, filtered and concentrated to dryness. Chromatography on silica gel (10% CH3CN-DCM increasing to 25% CH3CN and then to 5% MeOH) provided the title compound as a pale yellow amorphous solid. 1H NMR (500 MHz, CDCl3) δ 8.26 (d, J=1.9 Hz, 1H), 7.81 (d, J=8.7 Hz, 1H), 7.61 (dd, J=8.7, 2.1 Hz, 1H), 7.50 (d, J=8.1 Hz, 2H), 7.39 (d, J=8.0 Hz, 2H), 4.35 (s, 2H), 4.07 (s, 3H), 2.57 (s, 1H), 2.39 (s, 3H), 1.99 (s, 3H), 1.92 (s, 3H); MS (ESI): mass calcd. for C25H22ClF3N2O3, 490.1, m/z found 491.1 [M+H]+. 1-(4-Chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinolin-6-yl)-1-(2,4-dimethyloxazol-5-yl)ethanol was purified by chiral chromatography (Chiralpak AD-H, solvent: 95% heptane/5% ethanol), to give 2 enantiomers. The first eluting enantiomer was Example 10b and the second eluting enantiomer was Example 10c.

Provenance & Evidence