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To a flask containing tert-butyl 3-(4-chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinoline-6-carbonyl)azetidine-1-carboxylate (500 mg, 0.93 mmol, Intermediate 13: step b) was added THF (10 mL) and the solution was cooled to 0° C. Then, TMS-lithiumacetylide (0.5 M in Et2O, 2.0 mL, 1 mmol) was added and the reaction was allowed to warm gradually to room temperature. After 5 hours, additional TMS-lithiumacetylide (2 mL, 1.0 mmol, 0.5 M in Et2O) was added and the reaction mixture was stirred at room temperature overnight. After 24 hours, the mixture was quenched with aqueous NH4Cl solution and extracted with EtOAc (3×30 mL). The combined organics were washed with brine, dried over MgSO4, filtered and concentrated to dryness. Chromatography on silica gel (1% acetone-DCM increasing to 5% acetone) provided a mixture of title compound and the silylated title compound. To a flask containing tert-butyl-3-(1-(4-chloro-2-methoxy-3-(4-(trifluoromethyl)benzyl)quinolin-6-yl)-1-hydroxy-3-(trimethylsilyl)prop-2-yn-1-yl)azetidine-1-carboxylate (220 mg, 0.35 mmol) was added MeOH (8 mL) followed by 2 M aqueous KOH (0.4 mL) at room temperature. After stirring for 15 minutes, the reaction was concentrated and chromatographed directly on silica gel (5% acetone-DCM increasing to 25% acetone) to provide the title compound as an amorphous white solid. 1H NMR (500 MHz, CDCl3) δ 8.36 (d, J=1.1 Hz, 1H), 7.88-7.79 (m, 2H), 7.50 (d, J=8.2 Hz, 2H), 7.38 (d, J=8.1 Hz, 2H), 4.35 (s, 2H), 4.19-4.12 (m, 1H), 4.07 (s, 3H), 4.01-3.94 (m, 1H), 3.91-3.79 (m, 2H), 3.14-3.03 (m, 1H), 2.81 (s, 1H), 2.68 (s, 1H), 1.43 (s, 9H); MS (ESI): mass calcd. for C29H28ClF3N2O4, 560.2, m/z found 504.9 [M-t-Butyl]+.

1. temperatureto warm gradually to room temperature
2. waitAfter 24 hours
3. customthe mixture was quenched with aqueous NH4Cl solution
4. extractionextracted with EtOAc (3×30 mL)
5. washThe combined organics were washed with brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated to dryness
9. customChromatography on silica gel (1% acetone-DCM increasing to 5% acetone) provided