m-Chloroperbenzoic acid → 2-(6-carbamoyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-4-yl)pyridine N-oxide

HRID 1073893Notes

Reaction equation

HRID 1073893 reaction equation
[CH3:1][C:2]1([CH3:21])[CH2:7][CH:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][N:9]=2)[C:5]2[CH:14]=[C:15]([C:18]([NH2:20])=[O:19])[CH:16]=[CH:17][C:4]=2[O:3]1.ClC1C=CC=C(C(OO)=[O:30])C=1>ClCCl>[C:18]([C:15]1[CH:16]=[CH:17][C:4]2[O:3][C:2]([CH3:21])([CH3:1])[CH2:7][CH:6]([C:8]3[CH:13]=[CH:12][CH:11]=[CH:10][N+:9]=3[O-:30])[C:5]=2[CH:14]=1)(=[O:19])[NH2:20]

Participants

4

Reactant 2

HCID 70297m-Chloroperbenzoic acidHCID 198956333,4-dihydro-2,2-dimethyl-4-(2-pyridyl)-2H-1-benzopyran-6-carboxamide

Product 1

HCID 678684252-(6-carbamoyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-4-yl)pyridine N-oxideYield 27.5%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

564 mg of 3,4-dihydro-2,2-dimethyl-4-(2-pyridyl)-2H-1-benzopyran-6-carboxamide were dissolved in 20 ml of dichloromethane at room temperature and 540 mg of m-chloroperbenzoic acid were added. After stirring at room temperature overnight the mixture was washed with sodium bisulphite solution, sodium bicarbonate solution and water. The organic phase was dried over sodium sulphate and evaporated to give a solid which was recrystallized from isopropanol to yield 164 mg of 2-(6-carbamoyl-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-4-yl)pyridine N-oxide of melting point 248-250° C.

Workup

  1. washwas washed with sodium bisulphite solution, sodium bicarbonate solution and water
  2. dry with materialThe organic phase was dried over sodium sulphate
  3. customevaporated
  4. customto give a solid which
  5. customwas recrystallized from isopropanol

Sources & evidence

ORD record
ord-dcf1857519184275aa4d8f4284edc2a7
Source dataset
uspto-grants-1990_11
Patent number
US04971982

Reaction notes

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