Pyridine → 3-(7-Isopropyl-1-methylazulen-4-yl)butyl acetate

Participants

Reaction Steps

4.8 g (0.063 mol) of acetyl chloride in 20 ml of dichloromethane were added dropwise at 0° C. to a solution of 12.1 g (0.05 mol) of 3-(7-isopropyl-1-methylazulen-4-yl)butanol and 7.9 g (0.1 mol) of pyridine in 100 ml of dichloromethane, and the mixture was stirred at room temperature for 1 hour. It was then extracted with 30 ml of 2N hydrochloric acid, and the organic phase was washed neutral and dried over sodium sulfate. The residue remaining behind after evaporating off the solvent was chromatographed (silica gel; 9:1 v/v petroleum ether/ethyl acetate). This gave 12.6 g (89%) of the acetate as a highly viscous blue oil. Physical data: IR (KBr): 2959, 2929 (CH); 1741 (C=O); 1555, 1463, 1436, 1387, 1365, 1241, 1047 cm-1. 1H-NMR (CDCl2): δ=1.38 (d, 6H); 2.05 (s, 3H); 2.16 (cm, 2H); 2.68 (s, 3H); 3.08 (cm, 1H); 2.22 (cm, 2H); 4.18 (cm, 2H); 6.95 (d, 1H); 7.30 (d, 1H); 7.40 (d, 1H); 7.64 (d, 1H); 8.18 (s, 1H) ppm. 13C-NMR (CDCl3); δ=1286; 20.85; 24.72 (2C); 30.17; 34.53; 38.28; 64.22; 112.19; 124.41; 125.46; 133.30; 135.13; 136.39; 136.59; 137.28; 140.04; 147.55; 170.90 ppm. MS: m/e=284.4 (C19H24O2+, 50%).

Provenance & Evidence