Potassium Carbonate → 7-Nitro-4-(2-(pyrrolidin-1-yl)ethyl)-2H-benzo[b][1,4]oxazin-3(4H)-one

HRID 1917124Notes

Reaction equation

HRID 1917124 reaction equation
[N+:1]([C:4]1[CH:5]=[CH:6][C:7]2[NH:12][C:11](=[O:13])[CH2:10][O:9][C:8]=2[CH:14]=1)([O-:3])=[O:2].Cl.Cl[CH2:17][CH2:18][N:19]1[CH2:23][CH2:22][CH2:21][CH2:20]1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C.O>[N+:1]([C:4]1[CH:5]=[CH:6][C:7]2[N:12]([CH2:17][CH2:18][N:19]3[CH2:23][CH2:22][CH2:21][CH2:20]3)[C:11](=[O:13])[CH2:10][O:9][C:8]=2[CH:14]=1)([O-:3])=[O:2]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 816681-(2-Chloroethyl)pyrrolidine hydrochlorideHCID 27638307-nitro-3,4-dihydro-2H-1,4-benzoxazin-3-one

Product 1

HCID 591441157-Nitro-4-(2-(pyrrolidin-1-yl)ethyl)-2H-benzo[b][1,4]oxazin-3(4H)-oneYield 65.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

A suspension of 7-nitro-2H-benzo[b][1,4]oxazin-3(4H)-one (0.5 g, 2.575 mmol), 1-(2-chloroethyl)pyrrolidine hydrochloride (0.43 g, 2.575 mmol) and K2CO3 (1.06 g, 7.726 mmol) in dry DMF (5 mL) was stirred at 100° C. overnight (18 hours). The reaction was brought to room temperature, diluted with water (100 mL), and the product was extracted into ethyl acetate (2×25 mL). The combined ethyl acetate layers were washed with brine (20 mL) and dried (Na2SO4). The solvent was evaporated, and the crude material was purified by column chromatography (3:97 (2M NH3 in MeOH):CH2Cl2) to obtain the title compound (0.49 g, 65%) as a solid. 1H NMR (DMSO-d6) δ 1.62-1.70 (m, 4H), 2.46-2.54 (m, 4H, merged with DMSO-d6 resonance), 2.60 (t, 2H, J=6.9 Hz), 4.08 (t, 2H, J=6.9 Hz), 4.80 (s, 2H), 7.44 (d, 1H, J=9.3 Hz), 7.80 (d, 1H, J=2.4 Hz), 7.96 (dd, 1H, J=2.7, 9.0 Hz); ESI-MS (m/z, %): 292 (MH+, 100).

Workup

  1. customwas brought to room temperature
  2. extractionthe product was extracted into ethyl acetate (2×25 mL)
  3. washThe combined ethyl acetate layers were washed with brine (20 mL)
  4. dry with materialdried (Na2SO4)
  5. customThe solvent was evaporated
  6. customthe crude material was purified by column chromatography (3:97 (2M NH3 in MeOH):CH2Cl2)

Sources & evidence

ORD record
ord-34fd0b59b0d24611856987d40c5a8a20
Source dataset
uspto-grants-2013_12
Patent number
US08618286B2

Reaction notes

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