tert-Butanol → (R)-2,3,5,6-tetrafluoro-4-(4-((3-(1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethyl)ureido)methyl)-1H-1,2,3-triazol-1-yl)benzoic acid

Participants

Reaction Steps

To a suspension of (R)-1-(1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethyl)-3-(prop-2-ynyl)urea (5.0 mg, 0.01 mmol), prepared as described in Procedure 3, 4, 5, 6 and 12, in a 1:1 mixture of water and tert-butyl alcohol (100 μL) was added 4-azido-2,3,5,6-tetrafluorobenzoic acid (2.3 mg, 0.01 mmol), followed by sodium ascorbate (1 M solution in H2O, 100 μL) and CuSO4.5H2O (1 mg). The reaction mixture was stirred vigorously overnight in a sealed vial. The reaction mixture was diluted with H2O and extracted with EtOAc (3×). The combined organic portions were concentrated and the residue was dissolved in MeOH and purified by preparative HPLC (Phenoma Onyx Monolithic 10×100 mm; eluting with 10%-90% MeCN/H2O with 0.1% TFA, monitoring at 220 nm) to provide (R)-2,3,5,6-tetrafluoro-4-(4-((3-(1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethyl)ureido)methyl)-1H-1,2,3-triazol-1-yl)benzoic acid (Example 319, 5.7 mg, 78% yield). LC/MS: RT=3.610 min [M+H] 742.3 (Phenomenex Luna C18 column, 4.6×50 mm eluting with 10-90% MeOH/H2O over 4 minutes containing 0.1% NH4OAc; 4 mL/min, monitoring at 220 nm). 1H NMR (500 MHz, MeOH-d4) δ 8.02 (s, 1H), 7.10-6.79 (m, 11H), 6.53 (d, J=5 Hz, 2H), 6.27-6.04 (m, 1H), 4.38-4.31 (m, 2H), 3.81 (d, J=15 Hz, 1H), 3.73 (d, J=10 Hz, 1H).

Provenance & Evidence