反应详情

Methyl 2,3-dihydroxy-3-(2-nitrophenyl)propionate (Compound IIa) was prepared by adding 250 mg of osmium tetroxide (0.984 mmol) in one portion to a 0° C. solution of 15 g of methyl trans-3-(2'-nitrophenyl)propenoate (72.4 mmol) (Compound Ia) and 12.7 g of N-methylmorpholine-N-oxide (0.108 mol) in a solution containing 25 ml each of H2O, acetone and t-butanol (1:1:1). The reaction was warmed to room temperature, then stirred for 6 hr. Then, 50 ml of a freshly prepared solution of 20% (v/v) NaHSO3 was added slowly over 30 min to destroy excess oxidant. Several scoops of NaCl were added to the resulting reaction mixture, and then the product was extracted 3 times, each with 200 ml of ether. The combined extracts were washed with 150 ml of a saturated NaCl solution (brine), dried over MgSO4, and then concentrated in vacuo. The crude product, a light brown solid, was purified by recrystallization from ethanol to give 15.3 g (87% yield) of Compound IIa. M.p. 125.6-127.6° C.

1. customto destroy excess oxidant
2. additionSeveral scoops of NaCl were added to the resulting reaction mixture
3. extractionthe product was extracted 3 times
4. washThe combined extracts were washed with 150 ml of a saturated NaCl solution (brine)
5. dry with materialdried over MgSO4
6. concentrationconcentrated in vacuo
7. customThe crude product, a light brown solid, was purified by recrystallization from ethanol