Triethylamine → HCID 2734862, compound

Temperature

4 °C

To a cooled (4° C.) solution of (R)-2-amino-4-methylpentan-1-ol (2.98 g, 25.4 mmol) and triethylamine (7.6 mL, 54 mmol, 2.1 equiv) in CH2Cl2 (80 mL) was added dropwise a solution of triphosgene (2.52 g, 8.49 mmol, 0.334 equiv) in 10 ml of CH2Cl2 over 30 min. The reaction mixture was stirred at 4° C. for 15 min, warmed up to room temperature and stirred for an additional 1 h. The mixture was treated with saturated NH4Cl (25 mL), followed by CH2Cl2 (50 mL) and the resulting mixture was stirred for 20 min. The layers were separated and the organic layer was washed with water. The combined aqueous layers were extracted with CH2Cl2 (50 mL). The combined organic layers were dried over Na2SO4, filtered and concentrated to give (R)-4-isobutyloxazolidin-2-one (3.22 g) in 88% yield. The crude product was used for the next reaction without purification. 1H NMR (400 MHz, CD3OD) δ 4.53-4.47 (m, 1H), 4.00-3.92 (m, 2H), 1.67 (ddq, J=13, 8.0, 6.5 Hz, 1H), 1.56-1.48 (m, 1H), 1.40-1.32 (m, 1H), 0.95 (d, J=6.1 Hz, 3H), 0.93 (d, J=6.1 Hz, 3H).

1. temperaturewarmed up to room temperature
2. stirringstirred for an additional 1 h
3. stirringthe resulting mixture was stirred for 20 min
4. customThe layers were separated
5. washthe organic layer was washed with water
6. extractionThe combined aqueous layers were extracted with CH2Cl2 (50 mL)
7. dry with materialThe combined organic layers were dried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-451bd42c6d3c4080882d7aac59cfd199

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08957068B2