反应详情

A mixture of 2-pyridine-carboxaldehyde (8.5 ml, 0.052 mole), 2-iso-propyl-6-methylaniline (5 ml, 0.052 mole), 3 drops of formic acid and 30 ml methanol was stirred for five hours. The methanol was removed under vacuum. An oil-like residue was recrystallized from n-hexane. 2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine was isolated as yellow crystals. Yield: 10.25 g (82.8%). 1H NMR (200 MHz; CDCl3; δ, ppm; J, Hz): 1.18 d (6H, CH(CH3)2, J=6.9), 2.15 s (3H, CH3), 3.03 sept. (1H, CHMe2, J=6.9), 701-7.21 m (3H, C6H3), 7.41 d,d,d (1H, H(5) 3J4,5=7.5, 3J5,6=4.9, 4J3,5=1.3); 7.85 t,d,d (1H, H(4) 3J=7.7, 4J4,6=1.8, 5J=0.6); 8.28 d,t (1H, H(3) 3J3,4=7.9, J=1.1); 8.33 s (1H, HC═N); 8.73 d,d,d (1H, H(6) 3J5,6=4.9, 4J4,6=1.6, 5J3,6=1.0). 13C NMR, DEPT (50 MHz; CDCl3; δ, ppm): 18.6 (CH3), 23.3 (CH(CH3)2), 27.9 (CHMe2), 121.3 (C(3)H), 123.2 and 124.3 (C(3′)H and C(5′)H), 125.4 (C(5)H), 126.1 (C(6′)Me), 128.0 (C(4′)H), 136.7 (C(4)H), 137.9 (C(2′)i-Pr), 149.3 (C(1′)), 149.7 (C(6)H), 154.4 (C(2)), 163.4 (HC═N).

1. customThe methanol was removed under vacuum
2. customAn oil-like residue was recrystallized from n-hexane