Methyl 3-(6-nitro-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate → Methyl 3-(6-amino-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate

HRID 1742337Notes

Reaction equation

HRID 1742337 reaction equation
[N+:1]([C:4]1[CH:5]=[CH:6][C:7]2[O:12][CH2:11][CH2:10][N:9]([CH2:13][C:14]3[CH:15]=[C:16]([CH:21]=[CH:22][CH:23]=3)[C:17]([O:19][CH3:20])=[O:18])[C:8]=2[CH:24]=1)([O-])=O>C(OCC)(=O)C.[Pd]>[NH2:1][C:4]1[CH:5]=[CH:6][C:7]2[O:12][CH2:11][CH2:10][N:9]([CH2:13][C:14]3[CH:15]=[C:16]([CH:21]=[CH:22][CH:23]=3)[C:17]([O:19][CH3:20])=[O:18])[C:8]=2[CH:24]=1

Participants

4

Reactant 1

HCID 23365874Methyl 3-(6-nitro-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate

Product 1

HCID 54048005Methyl 3-(6-amino-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoateYield 51%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of methyl 3-(6-nitro-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate (0.65 g.) and palladium-on-carbon (10% w/w, 0.025 g.) in ethyl acetate (40 ml.) was hydrogenated at an initial pressure of 2.9 bar. The catalyst was removed by filtration through diatomaceous earth, washing the filter cake with ethyl acetate, and the filtrate was evaporated to give methyl 3-(6-amino-2,3-dihydrobenz-1,4-oxazin-4-ylmethyl)benzoate (X) (0.3 g., 51%) as a gum; partial NMR (80 MHz, CDCl3): 3.3(m,2H, N.CH2CH2.O); 3.9(s,3H, OMe); 4.15(m,2H, N.CH2.CH2.O); 4.5(s,2H, NCH2Ar ).

Workup

  1. customThe catalyst was removed by filtration through diatomaceous earth
  2. washwashing the filter cake with ethyl acetate
  3. customthe filtrate was evaporated

Sources & evidence

ORD record
ord-e63c21f99c2944e0a5e97596076860b0
Source dataset
uspto-grants-1994_08
Patent number
US05338734

Reaction notes

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