反应详情

2,5-Dimethoxytetrahydrofuran (4.92 g) was stirred in hydrochloric acid (1M, 25 ml) for 1 hour. 3,4-Dichlorobenzylamine (5 ml) was added to hydrochloric acid (1M, 15 ml) and the resulting suspension was added to the first solution. Phosphate buffer solution (pH 5.5, 250 ml) was added followed by sodium hydroxide (1.6 g). A solution of acetone dicarboxylic acid (4.77 g) in phosphate buffer solution (pH 5.5, 90 ml) was added to the mixture and the solution was stirred. A yellow solid formed and the mixture was left to stand for 64 h. The aqueous supernatant was decanted and hydrochloric acid (2.5M) was added to the solid along with ethyl acetate. The layers were separated and the aqueous phase was extracted twice with dichloromethane containing a little methanol. The organic layers were combined and evaporated to give a crude oil (ca 7 g). A portion of the product (ca 2.5 g) was purified by chromatography eluting with dichloromethane:methanol (19:1) to give the subtitle compound (1.62 g) as a yellow oil.

1. additionthe resulting suspension was added to the first solution
2. customA yellow solid formed
3. waitthe mixture was left
4. customThe aqueous supernatant was decanted
5. additionhydrochloric acid (2.5M) was added to the solid along with ethyl acetate
6. customThe layers were separated
7. extractionthe aqueous phase was extracted twice with dichloromethane containing a little methanol
8. customevaporated
9. customto give a crude oil (ca 7 g)
10. customA portion of the product (ca 2.5 g) was purified by chromatography
11. washeluting with dichloromethane:methanol (19:1)