Reaction Steps
To a solution of methyl(2S)-2-(tert-butoxy)-2-[(22S)-18-fluoro-4,22,28-trimethyl-21,27-dioxa-1,7,34-triazahexacyclo[26.2.2.16,9.110,14.02,7.015,20]tetratriaconta-2,4,6(34),8,10(33),11,13,15(20),16,18,24-undecaen-3-yl]acetate (20 mg, 0.030 mmol, 1 equiv) in MeOH (2 mL) was added 10% Pd/C (6 mg, 0.006 mmol, 0.2 equiv). The reaction was then stirred under a balloon of H2 for 2 h. The reaction was then filtered through Celite eluting with MeOH. The filtrate was then concentrated in vacuo. The crude hydrogenation product was taken upon in MeOH (1.5 mL), water (1 mL0, and THF (0.5 mL) and LiOH.H2O (37 mg, 0.913 mmol, 30 equiv) was added. The reaction was heated to 60° C. for 2 h. Upon cooling to ambient temperature, the reaction was filtered and purified via preparative LC/MS with the following conditions: Column: XBridge C18, 19×200 mm, 5-μm particles; Mobile Phase A: 5:95 acetonitrile:water with 10-mM ammonium acetate; Mobile Phase B: 95:5 acetonitrile:water with 10-mM ammonium acetate; Gradient: 50-90% B over 15 minutes, then a 5-minute hold at 100% B; Flow: 20 mL/min to provide the product (5.2 mg, 27%). 1H NMR (500 MHz, DMSO-d6) δ 8.07 (br. s., 2H), 7.97 (s, 1H), 7.50 (t, J=7.8 Hz, 1H), 7.35 (t, J=7.6 Hz, 1H), 7.29-7.21 (m, 2H), 7.08 (d, J=11.0 Hz, 1H), 6.83 (t, J=8.1 Hz, 1H), 5.79 (br. s., 1H), 4.70 (br. s., 1H), 3.82 (t, J=11.3 Hz, 1H), 2.63 (d, J=8.2 Hz, 1H), 2.39 (s, 3H), 1.94-1.57 (m, 12H), 1.52 (br. s., 1H), 1.19 (s, 3H), 1.15 (s, 9H), 1.12 (d, J=5.8 Hz, 3H); LCMS (ESI, M+1): 644.35.
