Dimethyl Sulfate → HCID 137078799, compound

Participants

Reaction Steps

To a stirred solution of 5-((4-(8-azidooctyloxy)phenyl)diazenyl)-2-hydroxybenzoic acid (400 mg, 0.97 mmol) in acetone (20 mL) was added powdered anhydrous potassium carbonate (270 mg, 1.94 mmol). Dimethyl sulfate (92 mg, 0.97 mmol) was then added dropwise at room temperature. The reaction mixture was heated at reflux for 20 min and then allowed to cool to ambient temperature. Volatiles were removed in vacuo, the residue taken up in EtOAc (40 mL), the solution washed with water (2×20 mL), brine, dried over Na2SO4, and filtered. Volatiles were removed in vacuo and the residue subjected to column chromatography on silica gel 60 (230-400 mesh) using EtOAc and hexanes (95:5) as the elutant to give 210 mg (0.49 mmol, 50%) of the product as a yellow solid, mp 58-60° C. 1H NMR (500 MHz, CDCl3) δ 1.39-1.51 (m, 8H), 1.64 (qt, 2H), 1.83 (qt, 2H), 3.28 (t, J=Hz, 2H), 4.02 (s, 3H), 4.05 (t, J=6.5 Hz, 2H), 7.88 (d, J=Hz, 2H), 8.07 (dd, J=Hz, 2.5 Hz, 1H), 8.42 (d, J=2.5 Hz, 1H), 11.06 (s, 1H); 13C NMR (125 MHz, CDCl3) δ 25.9, 26.7, 28.8, 29.1, 29.2, 51.5, 52.5, 68.2, 112.4, 114.7, 118.3, 124.5, 126.0, 128.7, 145.5, 146.7, 161.5, 163.3, 170.3; HRMS (ESI) calculated for C22H28N5O4 (M+H)+426.2135, observed 426.2141.

Provenance & Evidence