Diisopropylethylamine → Methyl Benzoate

Participants

Reaction Steps

Using General Procedure A: A solution of 3,3″-dimethyl-1′,2′,3′,4′,5′,6′-hexahydro-[2,2′;6′,2″]terpyridine (0.485 g, 1.81 mmol), 4-bromomethyl-benzoic acid methyl ester (0.642 g, 2.80 mmol), KI (64 mg, 0.38 mmol), and DIPEA (0.65 mL, 3.73 mmol) in DMF (9 mL) was heated at 60° C. for 23 hours. Purification of the crude material by column chromatography on silica gel (40:1:1 CH2Cl2—CH3OH—NH4OH) provided 0.67 g (89%) of 4-3,3″-dimethyl-3′,4′,5′,6′-tetrahydro-2′H-[2,2′;6′,2″]terpyridin-1′-ylmethyl)-benzoic acid methyl ester as a white solid. 1H NMR (CDCl3) δ 1.54-1.72 (m, 3H), 2.02-2.08 (m, 1H), 2.20-2.34 (m, 2H), 2.40 (s, 6H), 3.58 (s, 2H), 3.83 (s, 3H), 4.12 (d, 2H, J=11.4 Hz), 6.57 (d, 2H, J=7.8 Hz), 6.96 (dd, 2H, J=7.5, 4.5 Hz), 7.23 (d, 2H, J=7.5 Hz), 7.53 (d, 2H, J=7.8 Hz), 8.26 (d, 2H, J=4.5 Hz); ES-MS m/z 416 (M+H).

Provenance & Evidence