反应详情

To a stirred solution of 5-hexenoic acid q-1 (6.00 g, 52.6 mmol), t-butyl alcohol (72.2 mL, 735.84 mmol) and DMAP (1.28 g, 10.51 mmol) in DCM (150 mL) at −10° C. was added DCC (16.26 g, 78.84 mmol). After stirring at room temperature overnight, solid was filtered off. The filtrate was evaporated under reduced pressure to give a crude oil, which was purified by chromatography (Biotage; 65i). Elution with a gradient of EtOAc/Hexane from 5/95 to 10/90 yielded 4.16 g (46.53%) of t-butyl ester q-2, which displayed a 1H NMR spectrum that matched literature (Johnson, P. Y.; Berchtold, G. A. J. Org. Chem. 1970, 35, 584-592) and was used without further purification).

1. filtrationsolid was filtered off
2. customThe filtrate was evaporated under reduced pressure
3. customto give a crude oil, which
4. customwas purified by chromatography (Biotage; 65i)
5. washElution with a gradient of EtOAc/Hexane from 5/95 to 10/90