Phosphorus pentachloride → 2,2-dimethyl-propionic acid (R)-2-(7-nitro-1H-indol-2-yl)-4,5-dihydro-thiazol-4-ylmethyl ester

HRID 336464Notes

Reaction equation

HRID 336464 reaction equation
COC1C=CC(C[S:8][CH2:9][C@H:10]([NH:19][C:20]([C:22]2[NH:23][C:24]3[C:29]([CH:30]=2)=[CH:28][CH:27]=[CH:26][C:25]=3[N+:31]([O-:33])=[O:32])=O)[CH2:11][O:12][C:13](=[O:18])[C:14]([CH3:17])([CH3:16])[CH3:15])=CC=1.P(Cl)(Cl)(Cl)(Cl)Cl.C(=O)(O)[O-].[Na+]>ClCCl>[N+:31]([C:25]1[CH:26]=[CH:27][CH:28]=[C:29]2[C:24]=1[NH:23][C:22]([C:20]1[S:8][CH2:9][C@@H:10]([CH2:11][O:12][C:13](=[O:18])[C:14]([CH3:17])([CH3:16])[CH3:15])[N:19]=1)=[CH:30]2)([O-:33])=[O:32]

Participants

5

Reactant 3

HCID 24819Phosphorus pentachlorideHCID 516892Sodium BicarbonateHCID 595430732,2-Dimethyl-propionic acid (R)-3-(4-methoxy-benzylsulfanyl)-2-[(7-nitro-1H-indole-2-carbonyl)-amino]-propyl ester

Product 1

HCID 595431172,2-dimethyl-propionic acid (R)-2-(7-nitro-1H-indol-2-yl)-4,5-dihydro-thiazol-4-ylmethyl esterYield 69.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

2,2-Dimethyl-propionic acid (R)-3-(4-methoxy-benzylsulfanyl)-2-[(7-nitro-1H-indole-2-carbonyl)-amino]-propyl ester (1.6 g, 3.2 mmol) prepared in Step B was dissolved in dichloromethane (50 mL). Phosphorus pentachloride (1.3 g, 6.4 mmol) was added thereto, and the mixture was stirred for 5 h at room temperature. Saturated aqueous sodium bicarbonate solution was added to the mixture to quench the reaction. The reaction mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, filtered, and distilled under reduced pressure. The residue was purified by column chromatography to give the title compound (0.8 g, Yield 69%).

Workup

  1. customto quench
  2. customthe reaction
  3. extractionThe reaction mixture was extracted with ethyl acetate
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationfiltered
  6. distillationdistilled under reduced pressure
  7. customThe residue was purified by column chromatography

Sources & evidence

ORD record
ord-6188766306414a6482efa934750a5ea6
Source dataset
uspto-grants-2014_11
Patent number
US08889691B2

Reaction notes

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