1-Bromo-3-chloropropane → HCID 67777211, compound

HRID 2088475Notes

Reaction equation

[CH:1]1[N:5]2[C:6]3[C:11]([NH:12][C:13](=[O:14])[C:4]2=[CH:3][CH:2]=1)=[CH:10][CH:9]=[CH:8][CH:7]=3.[H-].[Na+].[Br:17][CH2:18][CH2:19][CH2:20][Cl:21]>CN(C=O)C.C(OCC)(=O)C>[Cl:21][CH2:20][CH2:19][CH2:18][N:12]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[N:5]2[CH:1]=[CH:2][CH:3]=[C:4]2[C:13]1=[O:14].[Br:17][CH2:18][CH2:19][CH2:20][N:12]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[N:5]2[CH:1]=[CH:2][CH:3]=[C:4]2[C:13]1=[O:14]

Participants

Conditions

Temperature: 80 °C

Procedure

Pyrrolo[1,2-a]quinoxalin-4(5H)-one (500 mg; 2.71 mmol) was dissolved in anhydrous DMF (10 mL) in a 25 mL round bottomed flask. NaH (68.6 mg; 2.71 mmol; 95%) was carefully added to the flask under a blanket of nitrogen. The reaction mixture was allowed to react for 2 h at room temperature after which 1-bromo-3-chloropropane (511.99 mg, 3.25 mg) was added and the mixture was heated to 80° C. overnight. The reaction mixture was diluted with ethyl acetate and washed with H2O, brine, dried over sodium sulfate, then filtered and concentrated. The crude mixture was purified by flash chromatography to yield the desired 5-(3-chloropropyl)pyrrolo[1,2-a]quinoxalin-4(5H)-one and 5-(3-bromopropyl)pyrrolo[1,2-a]quinoxalin-4(5H)-one in approximately a 60:40 ratio. The mixture was used in the next step without further purification. [M+1]+=261 Chloride; [M+1]+=305 Bromide. 1H NMR (CDCl3): δ 2.18-2.42 (2H); 3.49-3.62 (1H); 3.63-3.81 (1H); 4.38-4.50 (2H); 6.61-6.71 (1H); 7.13-7.514 (4H); 7.65-7.80 (2H).

Workup

additionwas added
washwashed with H2O, brine
dry with materialdried over sodium sulfate
filtrationfiltered
concentrationconcentrated
customThe crude mixture was purified by flash chromatography

Sources & evidence

ORD record: ord-d94a59bbef75441c9cfe19ad23229740
Source dataset: uspto-grants-2013_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08435993B2

Reaction notes

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