Carbon tetrabromide → HCID 57910006, compound

To a solution of 2-(3,3-dimethyl-morpholin-4-yl)-ethanol (7.2 g, 45 mmol) and CBr4 (16.4 g, 49 mmol, 1.1 equiv.) in THF (150 mL) was added dropwise a solution of PPh3 (12.9 g, 49 mmol, 1.1 equiv.) in THF (75 mL). The resulting slurry was stirred at room temperature for 19 hours, at which time the slurry was diluted with hexanes and filtered. The filtrate was concentrated in vacuo and the resulting oil was diluted with CH2Cl2. The solution was then washed twice with NaHCO3 (aqueous, saturated) and brine. The aqueous layers were back-extracted with CH2Cl2 and the combined organic layers were dried over Na2SO4 and concentrated. The crude product was distilled (65° C., 0.5 torr) to provide 4-(2-Bromo-ethyl)-3,3-dimethyl-morpholine (5.4 g, 54%) as a yellow oil. 1H NMR (CDCl3, 400 MHz) δ 3.69 (t, 2H), 3.28 (s, 2H), 3.28 (t, 2H), 2.70 (t, 2H), 2.58 (t, 2H), 0.99 (s, 6H); LC/MS found 222.02 (M++H, C8H17BrNO requires 222.05).

1. filtrationfiltered
2. concentrationThe filtrate was concentrated in vacuo
3. additionthe resulting oil was diluted with CH2Cl2
4. washThe solution was then washed twice with NaHCO3 (aqueous, saturated) and brine
5. extractionThe aqueous layers were back-extracted with CH2Cl2
6. dry with materialthe combined organic layers were dried over Na2SO4
7. concentrationconcentrated
8. distillationThe crude product was distilled (65° C., 0.5 torr)

ORD record

ord-ff98822b201d45e099ccd0e56debabb1

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08420597B2