m-Chloroperbenzoic acid → 3-Bromo-6,7-dihydro-5H-cyclopenta[b]pyridine 1-oxide
Reaction equation
[Br:1][C:2]1[CH:3]=[N:4][C:5]2[CH2:6][CH2:7][CH2:8][C:9]=2[CH:10]=1.ClC1C=C(C=CC=1)C(OO)=[O:16]>C(Cl)(Cl)Cl>[Br:1][C:2]1[CH:3]=[N+:4]([O-:16])[C:5]2[CH2:6][CH2:7][CH2:8][C:9]=2[CH:10]=1Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 0 °C
Procedure
A solution of 3-bromo-6,7-dihydro-5H-[1]pyrindine (4 gm) and 3-chloroperoxybenzoic acid (2 equiv.) in CHCl3 was refluxed for 3 hours. An additional equivalent of 3-chloroperoxybenzoic acid was added to the reaction and heating was continued for another hour. The reaction was then cooled to 0° C., filtered, and extracted into CH2Cl2 from 1:1 saturated NaHCO3 /NaHCO3 (using caution), dried over Na2SO4, filtered, and evaporated. The residue was chromatographed on silica gel using 10:1 hexane/ethyl acetate to remove remaining starting material, ethyl acetate to remove 3-chloroperoxybenzoic acid residues, and then 10% MeOH/CH2Cl2 to elute the final compound. The product yield was 2 gm. 1H NMR(CDCl3): d 8.20 (s, 1 H), 7.25 (s, 1 H), 3.10 (m, 4 H), 2.20 (m, 2 H).
Workup
- temperatureheating
- waitwas continued for another hour
- filtrationfiltered
- extractionextracted into CH2Cl2 from 1:1 saturated NaHCO3 /NaHCO3 (using caution)
- dry with materialdried over Na2SO4
- filtrationfiltered
- customevaporated
- customThe residue was chromatographed on silica gel using 10:1 hexane/ethyl acetate
- customto remove
- customto remove 3-chloroperoxybenzoic acid residues
- wash10% MeOH/CH2Cl2 to elute the final compound
Sources & evidence
- ORD record
- ord-a0676a16f43545f0a5ed4f7bf6e69a88
- Source dataset
- uspto-grants-1994_08
- Patent number
- US05338740
Reaction notes
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