反应详情

A solution of (2′R,6′S)-3,3″-dimethyl-1′,2′,3′,4′,5′,6′-hexahydro-[2,2′;6′,2″]terpyridine (308 mg, 1.15 mmol), 6-bromo-hexanoic acid ethyl ester (283 mg, 1.27 mmol), DIPEA (260 μL, 1.49 mmol) and KI (10 mg, 0.060 mmol) in CH3CN (12 mL) was warmed to 60° C. and stirred for 23 h according to General Procedure A. Purification by flash chromatography on silica gel using CH2Cl2/MeOH/NH4OH (94:5:1) afforded 6-((2′R,6′S)-3,3″-dimethyl-3′,4′,5′,6′-tetrahydro-2′H-[2,2′;6′,2″]terpyridin-1′-yl)-hexanoic acid ethyl ester (425 mg, 90%) as a yellow oil. 1H NMR (CDCl3) δ 0.60-0.68 (m, 2H), 0.79-0.85 (m, 1H), 1.13-1.25 (m, 5H), 1.58-1.70 (m, 3H), 1.94-1.98 (m, 4H), 2.08-2.25 (m, 7H), 2.48 (bs, 6H), 1.50-2.63 (m, 2H), 4.03 (q, 2H, J=7.1 Hz), 7.05-7.08 (m, 2H), 7.43 (d, 2H, J=7.3 Hz), 8.47 (bs, 2H).

1. customPurification by flash chromatography on silica gel