Ethylene Glycol → HCID 18001580, compound

Participants

Reaction Steps

A solution of 2,4-dichlorobenzeneboronic acid (572 mg, 3.00 mmol) and ethylene glycol (205 mg, 3.30 mmol) in benzene (20 mL) was heated to reflux with azeotropic removal of water for a period of 8 h. The resulting solution was cooled, and treated with 6-chloro-8-ethyl-9-(1-ethylpentyl)purine (see Example 2, Part C above; 562 mg, 2.00 mmol), thallium carbonate (1.03 g, 2.20 mmol) and tetrakis(triphenylphosphine)palladium (116 mg, 0.10 mmol). The resulting mixture was heated to reflux with stirring for 12 h, then cooled, filtered through celite and evaporated. The resulting residue was separated by column chromatography (silica gel, 10:90 ethyl acetate-hexane) to afford the title compound as a viscous oil (530 mg, 1.35 mmol, 68%). TLC RF 0.31 (20:80 ethyl acetate-hexane). 1H NMR (300 MHz, CDCl3): d 8.94 (1H, s), 7.71 (1H, d, J=8.4 Hz), 7.58 (1H, d, J=1.8 Hz), 7.41 (1H, dd, J=8.4, 1.8 Hz), 4.27 (1H, br), 2.95 (2H, q, J=7.3 Hz), 2.41 (2H, br), 2.11-1.98 (2H, br), 1.42 (3H, t, J=7.3 Hz), 1.37-1.20 (3H, m), 1.09-0.99 (1H, m), 0.84 (3H, t, J=7.7 Hz), 0.82 (3H, t, J=7.7 Hz). MS (NH3—CI): m/e calc'd for C20H25NCl2: 391.1456, found 391.1458; 395 (11), 394 (14), 393 (71), 392 (29), 391 (100).

Provenance & Evidence