Dichloromethane → 7-amino-4-methyl-3,4-dihydro-2H-1,4-benzoxazin-3-one

HRID 1991282ノート

反応式

HRID 1991282 の反応式
[CH3:1][N:2]1[C:7]2[CH:8]=[CH:9][C:10]([N+:12]([O-])=O)=[CH:11][C:6]=2[O:5][CH2:4][C:3]1=[O:15].[Cl-].[NH4+].C(Cl)Cl>CCO.O.[Fe]>[CH3:1][N:2]1[C:7]2[CH:8]=[CH:9][C:10]([NH2:12])=[CH:11][C:6]=2[O:5][CH2:4][C:3]1=[O:15]

参加物

7

反応物 3

HCID 6344DichloromethaneHCID 25517Ammonium ChlorideHCID 218778052H-1,4-Benzoxazin-3(4H)-one, 4-methyl-7-nitro-

生成物 1

HCID 27644607-amino-4-methyl-3,4-dihydro-2H-1,4-benzoxazin-3-one

試薬・触媒・溶媒 3

HCID 23925Iron触媒HCID 702Ethanol溶媒HCID 962Water溶媒

反応条件

温度
80 °C

実験手順

To a stirred suspension of 4-methyl-7-nitro-2H-1,4-benzoxazin-3-one (DE 19802239, 2.43 g, 11.67 mmol) in EtOH (20 mL) and water (10 mL) is added ammonium chloride (6.25 g, 116.70 mmol). To this mixture is added iron (1.95 g, 35.00 mmol) in 3 equal portions. The resulting mixture is heated to 80° C. for 2 h at which time the reaction is cooled to room temperature followed by addition of CH2Cl2 (100 mL). The resulting mixture is filtered through celite and the filtrate is further diluted with water (100 mL). The organic layer is separated followed by further extraction of the aqueous phase with CH2Cl2 (3×50 mL). The organic phases are combined, dried over Na2SO4 and concentrated under reduced pressure, and the product is purified by silica gel column chromatography (EtOAc) to give the title compound in quantitative yield, MS m/z 179.1 (M+H)+.

後処理

  1. temperatureis cooled to room temperature
  2. filtrationThe resulting mixture is filtered through celite
  3. additionthe filtrate is further diluted with water (100 mL)
  4. customThe organic layer is separated
  5. extractionfollowed by further extraction of the aqueous phase with CH2Cl2 (3×50 mL)
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated under reduced pressure
  8. customthe product is purified by silica gel column chromatography (EtOAc)

出典と根拠

ORDレコード
ord-e39d12c90b914782944f8a9dc9d3a6d6
出典データセット
uspto-grants-2010_01
特許番号
US07645781B2

反応ノート

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