反应详情

Acetic acid (1.7 mL) was slowly added to a solution of tetrahydrofuran-3-ylhydrazine hydrochloride (2.50 g, 18.0 mmol) (prepared as described by Bacon, E. R.; Singh, B.; and Lesher, G. Y. in U.S. Pat. No. 5,294,612) in water (30 mL). This mixture was then added dropwise to a solution of pyruvaldehyde (2.59 g, 2.34 mL, 14.4 mmol) in water (240 mL). The mixture was stirred overnight at room temperature. The mixture was poured into a seperatory funnel, NaCl was added and dissolved in the aqueous phase and then extracted with CH2Cl2 (6-times). The combined organic extracts were dried over Na2SO4, filtered and concentrated to provide crude material, which was purified by preadsorbing the oil on SiO2 followed by chromatography (Isco, 80 g RediSep column) eluting with a 0-80% EtOAc/heptane gradient over 80 minutes. Analysis of fractions resulted in isolation of 2-oxopropanal tetrahydrofuran-3-ylhydrazone (1.19 g, 53%).

1. customprepared
2. additionThe mixture was poured into a seperatory funnel
3. dissolutiondissolved in the aqueous phase
4. extractionextracted with CH2Cl2 (6-times)
5. dry with materialThe combined organic extracts were dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customto provide crude material, which
9. customwas purified
10. washeluting with a 0-80% EtOAc/heptane gradient over 80 minutes