Реакция #169197

Уравнение реакции

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

4-chlorophenylmagnesium bromide

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title compound

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

Растворители

toluene ether

Условия реакции

Обработка

1. 1
   Другоеat 0° C.
2. 2
   Другоеbefore being quenched with 1N HCl (200 ml)
3. 3
   ЭкстракцияThe aqueous layer was extracted with EtOAc (3×150 ml)
4. 4
   Промывкаthe combined organics were washed with brine (100 ml)
5. 5
   Сушкаdried over Na2SO4
6. 6
   Фильтрацияfiltered
7. 7
   Концентрированиеconcentrated under reduced pressure
8. 8
   workup.DISSOLUTIONThe crude compound was then dissolved in ethanol (400 ml)
9. 9
   workup.ADDITION6N HCl (160 ml) was added
10. 10
    ТемператураThe reaction mixture was refluxed for 2 h
11. 11
    Концентрированиеbefore being concentrated to one-third in volume
12. 12
    ФильтрацияThe resulting solid was filtered
13. 13
    Промывкаwashed twice with ether
14. 14
    ЭкстракцияThe aqueous layer was extracted with EtOAc (3×150 ml)
15. 15
    Промывкаthe combined organics were washed with brine (150 ml)
16. 16
    Сушкаdried over Na2SO4
17. 17
    Фильтрацияfiltered
18. 18
    Концентрированиеconcentrated under reduced pressure

Методика

To a solution of 2-methyl-6-(methyloxy)-4H-3,1-benzoxazin-4-one (for a preparation see Reference compound A) (40.0 g, 0.21 mol) in a toluene/ether (2/1) mixture (760 ml) at 0° C. was added dropwise a solution of 4-chlorophenylmagnesium bromide (170 ml, 1M in diethyl ether, 0.17 mol). The reaction mixture was allowed to warm to room temperature and stirred for 1 h before being quenched with 1N HCl (200 ml). The aqueous layer was extracted with EtOAc (3×150 ml) and the combined organics were washed with brine (100 ml), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude compound was then dissolved in ethanol (400 ml) and 6N HCl (160 ml) was added. The reaction mixture was refluxed for 2 h before being concentrated to one-third in volume. The resulting solid was filtered and washed twice with ether before being suspended in EtOAc and neutralised with 1N sodium hydroxide. The aqueous layer was extracted with EtOAc (3×150 ml) and the combined organics were washed with brine (150 ml), dried over Na2SO4, filtered and concentrated under reduced pressure. The title compound was obtained as a yellow solid (39 g, 88% yield); LC/MS (Method D): m/z 262 [M+H]+, Rt 2.57 min.

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