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

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).

1. customIn an oven dried 1-dram
2. concentrationAt the conclusion of this period, the reaction mixture was concentrated
3. custompurified by preparative HPLC (PHENOMENEX® Axia Luna column
4. custom25 min gradient
5. custom100% B and 3 min 100% B

ORD record

ord-291cdeb992b8469e95d820a6ccec9345

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09062028B2