2,4,5-Trichlorophenol → Ethyl 2-(4-(1-(4-(2,4,5-trichlorophenoxy)butanoyl)-1,2,3,4-tetrahydroquinolin-5-yl)-1H-pyrazol-1-yl)acetate

Participants

Reaction Steps

In an oven dried 1-dram vial was a mixture of ethyl 2-(4-(1-(4-hydroxybutanoyl)-1,2,3,4-tetrahydroquinolin-5-yl)-1H-pyrazol-1-yl)acetate (40 mg, 0.108 mmol), 2,4,5-trichlorophenol (34.0 mg, 0.172 mmol), triphenylphosphine (45.2 mg, 0.172 mmol) in CH2Cl2 (35.9 mL). DIAD (29.2 μL, 0.172 mmol) was added, and the reaction mixture was stirred at room temperature overnight. At the conclusion of this period, the reaction mixture was concentrated and purified by preparative HPLC (PHENOMENEX® Axia Luna column, 5μ, C18, 21.2×250 mm; 25 min gradient from 40% A:60% B to 0% A:100% B and 3 min 100% B (A=90% H2O/10% MeOH+0.1% TFA); (B=90% MeOH/10% H2O+0.1% TFA); detection at 220 nm) to afford the title compound (18.9 mg, 32% yield) as a colorless oil. LCMS, [M+H]+=550.1. 1H NMR (400 MHz, MeOD) δ 7.76 (s, 1H), 7.61 (s, 1H), 7.48 (s, 1H), 7.28-7.16 (m, 4H), 5.06 (s, 2H), 4.25 (q, J=7.1 Hz, 2H), 4.04 (br. s, 2H), 3.77 (t, J=6.8 Hz, 2H), 2.79 (t, J=7.0 Hz, 2H), 2.66 (br. s, 2H), 2.13 (dt, J=12.7, 6.4 Hz, 2H), 1.92-1.80 (m, 2H), 1.29 (t, J=7.1 Hz, 3H).

Provenance & Evidence