反应详情

A 20 L jacketed reactor was fit with a gas inlet and a 2 L dripping funnel. A nitrogen sweep was begun over the reactor and maintained throughout the process. To the reactor was charged 392 g (9.26 mol) of lithium chloride, 1332 g (6.479 mol) of copper bromide dimethylsulfide complex and 11 L of tetrahydrofuran. The reaction was stirred for 30 minutes at room temperature and then cooled to −15° C. To the reaction mixture was added 4.268 L (12.80 mol) of 3.0M methyl magnesium chloride at a rate such that the reaction temperature did not exceed −10° C. Upon completion of the addition, the cuprate solution was allowed to stir at −5° C. overnight. To the cuprate solution was added 500 g (3.09 mol) of (S)-3-((E)-2-methyl-pent-2-enoyl)-4-phenyl-oxazolidin-2-one as a solid. The reaction was stirred at −3° C. for 2 hours. The reaction solution was charged to a 22 L round bottom flask containing 800 mL of acetic acid and 2 L of tetrahydrofuran at a rate such that the temperature of the quench solution did not exceed 25° C. To the quenched solution was added 6 L water. The resulting emulsion was filtered and the layers were separated. The organic layer was extracted with 9 L of 4.8 M NH4OH followed by 9 L of saturated NH4Cl. The organic layer was clarified through a plug of magnesol. The organic layer was concentrated to give 822 g of a crude solid. The crude solid was recrystallized from 8 L of 20% H2O in MeOH, filtered and dried in a vacuum oven to give 550 g of a white solid. The white solid was recrystallized from 5 L of 20% H2O in MeOH, filtered and dried in a vacuum oven to give 475 g of the titled compound: 1H-NMR (DMSO) 7.338-7.224 (m, 5H), 5.431-5.399 (q, 1H, J=4.288), 4.696-4.652 (t, 1H, J=8.773), 4.120-4.087 (m, 1H), 3.622-3.556 (m, 1H), 1.648-1.584 (m, 1H), 1.047-0.968 (m, 1H), 0.900-0.883 (d, 3H, J=6.823), 0.738-0.721 (d, 3H, J=6.628), 0.693-0.656 (t, 3H, J=7.408); Anal Calc'd for C16H21N1O3: C, 69.79; H, 7.69; N, 5.09. Found: C, 69.81; H, 7.61; N, 5.07; MS (Ion Mode: APCI) m/z=276 [M+1]+.

1. customwas fit with a gas inlet
2. temperaturemaintained throughout the process
3. temperaturecooled to −15° C
4. customdid not exceed −10° C
5. additionUpon completion of the addition
6. stirringto stir at −5° C. overnight
7. stirringThe reaction was stirred at −3° C. for 2 hours
8. additionThe reaction solution was charged to a 22 L round bottom flask
9. customdid not exceed 25° C
10. filtrationThe resulting emulsion was filtered
11. customthe layers were separated
12. extractionThe organic layer was extracted with 9 L of 4.8 M NH4OH
13. concentrationThe organic layer was concentrated
14. customto give 822 g of a crude solid
15. customThe crude solid was recrystallized from 8 L of 20% H2O in MeOH
16. filtrationfiltered
17. customdried in a vacuum oven