Cesium carbonate → (S)-(5-cyclobutoxy-2-methyl-6-(2H-1,2,3-triazol-2-yl)-3,4-dihydroquinolin-1(2H)-yl)(cyclopropyl)methanone

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-cyclopropyl(5-hydroxy-2-methyl-6-(2H-1,2,3-triazol-2-yl)-3,4-dihydroquinolin-1(2H)-yl)methanone (0.055 g, 0.18 mmol), bromocyclobutane (0.050 g, 0.37 mmol), and cesium carbonate (0.150 g, 0.46 mmol) in acetonitrile (5 mL) stirred for 18 h at 80° C. The reaction mixture was cooled to room temperature and filtered, and the filtrate was concentrated under vacuum. The residue was purified by preparative-HPLC with the following conditions (Waters 1): Column, XBridge Prep C18 OBD Column, 5 um, 19×150 mm; mobile phase, water (0.03% aqueous ammonia) and acetonitrile (16% to 34% acetonitrile in 10 min, flow rate: 20 mL/min); Detector: UV 220&254 nm. This afforded (S)-(5-cyclobutoxy-2-methyl-6-(2H-1,2,3-triazol-2-yl)-3,4-dihydroquinolin-1(2H)-yl)(cyclopropyl)methanone (0.030 g, 45%) as a white solid. 1H NMR (300 MHz, CD3OD) δ ppm 0.67-0.75 (m, 1H), 0.85-0.95 (m, 2H), 1.11-1.17 (m, 4H), 1.22-1.55 (m, 3H), 1.74-2.01 (m, 5H), 2.31-2.46 (m, 2H), 2.95-3.07 (m, 1H), 3.88-3.94 (m, 1H), 4.72-4.82 (m, 1H), 7.28 (d, J=8.40 Hz, 1H), 7.37 (d, J=8.40 Hz, 1H), 7.99 (s, 2H). MS (ESI, pos. ion) m/z 353 [M+H]+.

Provenance & Evidence