反应 #657348

反应方程式

toluene

2-methyl-6-(methyloxy)-4H-3,1-benzoxazin-4-one

4-chlorophenylmagnesium bromide

→

title compound

[2-amino-5-(methyloxy)phenyl](4-chlorophenyl)methanone

溶剂

ether

反应条件

后处理

1. 1
   其他at 0° C.
2. 2
   其他before being quenched with 1N HCl
3. 3
   萃取The aqueous layer was extracted with EtOAc (3×)
4. 4
   洗涤the combined organics were washed with brine
5. 5
   干燥dried over Na2SO4
6. 6
   过滤filtered
7. 7
   浓缩concentrated under reduced pressure
8. 8
   workup.DISSOLUTIONThe crude compound was then dissolved in EtOH (400 mL)
9. 9
   workup.ADDITION6N HCl (160 mL) was added
10. 10
    温度The reaction mixture was refluxed for 2 h
11. 11
    浓缩before being concentrated under reduced pressure
12. 12
    过滤The resulting solid was filtered
13. 13
    洗涤washed twice with ether
14. 14
    萃取The aqueous layer was extracted with EtOAc (3×)
15. 15
    洗涤the combined organics were washed with brine
16. 16
    干燥dried over Na2SO4
17. 17
    过滤filtered
18. 18
    浓缩concentrated under reduced pressure

实验过程

To a solution of 2-methyl-6-(methyloxy)-4H-3,1-benzoxazin-4-one (for a preparation see Intermediate 8) (40.0 g, 0.21 mol) in a toluene (560 mL)/ether (200 mL) mixture at 0° C. was added dropwise a solution of 4-chlorophenylmagnesium bromide (170 mL, 1M in Et2O, 0.17 mol). The reaction mixture was allowed to warm to RT and stirred for 1 h before being quenched with 1N HCl. The aqueous layer was extracted with EtOAc (3×) and the combined organics were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude compound was then dissolved in EtOH (400 mL) and 6N HCl (160 mL) was added. The reaction mixture was refluxed for 2 h before being concentrated under reduced pressure. The resulting solid was filtered and washed twice with ether before being suspended in EtOAc and neutralised with 1N NaOH. The aqueous layer was extracted with EtOAc (3×) and the combined organics were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The title compound was obtained as a yellow solid (39 g, 88% yield) which was used without further purification.

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