Acetyl chloride → HCID 53866831, compound

HRID 2084925Notes

Reaction equation

HRID 2084925 reaction equation
[CH2:1]([O:3][C:4]([CH:6]1[CH2:11][NH:10][CH2:9][CH2:8][N:7]1[S:12]([C:15]1[CH:20]=[CH:19][C:18]([O:21][CH2:22][C:23]#[C:24][CH3:25])=[CH:17][CH:16]=1)(=[O:14])=[O:13])=[O:5])[CH3:2].C(N(CC)CC)C.[C:33](Cl)(=[O:35])[CH3:34]>ClCCl.CN(C1C=CN=CC=1)C.C(OCC)(=O)C>[CH2:1]([O:3][C:4]([CH:6]1[CH2:11][N:10]([C:33](=[O:35])[CH3:34])[CH2:9][CH2:8][N:7]1[S:12]([C:15]1[CH:20]=[CH:19][C:18]([O:21][CH2:22][C:23]#[C:24][CH3:25])=[CH:17][CH:16]=1)(=[O:13])=[O:14])=[O:5])[CH3:2]

Participants

7

Reactant 3

HCID 6367Acetyl chlorideHCID 8471TriethylamineHCID 54175880HCID 54175880, compound

Product 1

HCID 53866831HCID 53866831, compoundYield 68.3%

Reagents, catalysts & solvents 3

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 0.170 g (0.466 mmol) of 1-(4-but-2-ynyloxy-benzenesulfonyl)-piperazine-2-carboxylic acid ethyl ester in 10 mL of dichloromethane cooled at 0° was added 0.2 mL of triethylamine, 0.05 g of DMAP and 0.3 mL (0.93 mmol) of acetyl chloride. After stirring for 13 h the mixture was diluted with ethyl acetate and washed with saturated aqueous sodium bicarbonate. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo. The resulting residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (2:1) to provide 0.13 g (68%) of 4-acetyl-1-(4-but-2-ynyloxy-benzenesulfonyl)-piperazine-2-carboxylic acid ethyl ester as a brown oil. Electrospray Mass Spec: 409.3 (M+H)+.

Workup

  1. washwashed with saturated aqueous sodium bicarbonate
  2. dry with materialThe organic layer was dried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe resulting residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (2:1)

Sources & evidence

ORD record
ord-a81998ce8eed453786b70520939454e1
Source dataset
uspto-grants-2004_04
Patent number
US06716833B2

Reaction notes

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