Lawesson's reagent → 4-(3-{2-[Tert-butoxycarbonyl-(3,4-difluoro-phenyl)-amino]-thioacetylamino}-4-methyl-benzyl)-piperazine-1-carboxylic acid tert-butyl ester

HRID 1267914Notes

Reaction equation

HRID 1267914 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH2:14][C:15]2[CH:20]=[CH:19][C:18]([CH3:21])=[C:17]([NH:22][C:23](=O)[CH2:24][N:25]([C:34]([O:36][C:37]([CH3:40])([CH3:39])[CH3:38])=[O:35])[C:26]3[CH:31]=[CH:30][C:29]([F:32])=[C:28]([F:33])[CH:27]=3)[CH:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:51])=CC=1>C1(C)C=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH2:14][C:15]2[CH:20]=[CH:19][C:18]([CH3:21])=[C:17]([NH:22][C:23](=[S:51])[CH2:24][N:25]([C:34]([O:36][C:37]([CH3:40])([CH3:39])[CH3:38])=[O:35])[C:26]3[CH:31]=[CH:30][C:29]([F:32])=[C:28]([F:33])[CH:27]=3)[CH:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

4

Reactant 2

HCID 87949Lawesson's reagentHCID 120432244-(3-{2-[Tert-butoxycarbonyl-(3,4-difluoro-phenyl)-amino]-acetylamino}-4-methyl-benzyl)-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 542472024-(3-{2-[Tert-butoxycarbonyl-(3,4-difluoro-phenyl)-amino]-thioacetylamino}-4-methyl-benzyl)-piperazine-1-carboxylic acid tert-butyl esterYield 82.2%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 4-(3-{2-[tert-butoxycarbonyl-(3,4-difluoro-phenyl)-amino]-acetylamino}-4-methyl-benzyl)-piperazine-1-carboxylic acid tert-butyl ester (160 mg) in toluene (4 ml) was added Lawesson's reagent (100 mg) and the reaction heated at 100° C. for 2.5 hr. After cooling to room temperature, the solvent was removed in vacuo to afford a yellow powder. Purification by NPHPLC (0-5% MeOH in CH2Cl2) afforded 4-(3-{2-[tert-butoxycarbonyl-(3,4-difluoro-phenyl)-amino]-thioacetylamino}-4-methyl-benzyl)-piperazine-1-carboxylic acid tert-butyl ester (120 mg). This was taken up in CH2Cl2 (1 ml) and trifluoroacetic acid (0.63 ml) added. After 2 hr stirring the reaction was poured into aqueous K2CO3 and the organic layer was separated, washed with aqueous K2CO3 and brine, dried (Na2SO4) and concentrated to leave yellow crystals. They were purified further by reverse phase HPLC to afford the title compound (14 mg).

Workup

  1. temperatureAfter cooling to room temperature
  2. customthe solvent was removed in vacuo
  3. customto afford a yellow powder
  4. customPurification by NPHPLC (0-5% MeOH in CH2Cl2)

Sources & evidence

ORD record
ord-b3ac5dd333934e41bf8bb9fc468dc7a2
Source dataset
uspto-grants-2003_04
Patent number
US06555541B1

Reaction notes

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