Benzylethanolamine → 4-Benzylmorpholine-2-carboxylic acid hydrochloride

A 500 mL reactor under N2 is successively loaded with toluene (36.72 mL) and 2-chloroacrylonitrile (10.7 g, 122.23 mmol) at room temperature. Then, N-benzyl ethanolamine (18.36 g, 121.14 mmol) is added over 5 min and the reaction mixture is post-agitated at room temperature for 16 h. Then, the mixture is diluted with toluene (110.16 mL), cooled to −5° C. and 2M potassium tert-butoxide solution in THF (121.14 mmol) is slowly added over 30 min, maintaining the temperature at −5° C. to 0° C. The mixture is post-agitated at about −5° C. to 0° C. for 1 h, then quenched by adding water (45.9 mL). The aqueous layer is separated and the toluene layer is washed with water (45.9 mL) and then the mixture is allowed to warm to room temperature. The organic layer is then concentrated under reduced pressure at 40° C. Then, the mixture is diluted with toluene (100 mL) and extracted with 6N HClaq (162 mL). This aqueous layer is heated up to the reflux for 1 h 30, then the mixture is allowed to stir at room temperature overnight. After crystallization of 91, the solid is filtered, rinsed with 6N HClaq (40 mL) and dried under reduce pressure at 40° C. (19 g, yield=61%).

1. temperaturecooled to −5° C.
2. temperaturemaintaining the temperature at −5° C. to 0° C
3. stirringThe mixture is post-agitated at about −5° C. to 0° C. for 1 h
4. customquenched
5. additionby adding water (45.9 mL)
6. customThe aqueous layer is separated
7. washthe toluene layer is washed with water (45.9 mL)
8. temperatureto warm to room temperature
9. concentrationThe organic layer is then concentrated under reduced pressure at 40° C
10. additionThen, the mixture is diluted with toluene (100 mL)
11. extractionextracted with 6N HClaq (162 mL)
12. temperatureThis aqueous layer is heated up to the
13. temperaturereflux for 1 h 30
14. stirringto stir at room temperature overnight
15. customAfter crystallization of 91
16. filtrationthe solid is filtered
17. washrinsed with 6N HClaq (40 mL)
18. customdried
19. customat 40° C.

ORD 기록

ord-54fa4ad3018b43109b1c48ab5b1d7e67

출처 데이터셋

uspto-grants-2008_09

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07423037B2