Trifluoroacetic acid → 4-chloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

HRID 1965314Notes

Reaction equation

HRID 1965314 reaction equation
[Cl:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4](O)([C:12]1[C:20]([OH:21])=[CH:19][C:15]3[O:16][CH2:17][O:18][C:14]=3[CH:13]=1)[C:5](=[O:11])[NH:6]2.FC(F)(F)C(O)=O.C([SiH](CC)CC)C>ClCCl>[Cl:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]([C:12]1[C:20]([OH:21])=[CH:19][C:15]3[O:16][CH2:17][O:18][C:14]=3[CH:13]=1)[C:5](=[O:11])[NH:6]2

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 666726354-chloro-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

Product 1

HCID 666726824-chloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-oneYield 83%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-chloro-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (6.00 g, 18.8 mmol) in anhydrous dichloromethane (70.0 mL) was added trifluoroacetic acid (30.7 g, 269 mmol) and triethylsilane (18.0 mL, 13.1 g, 113 mmol) at ambient temperature. The reaction mixture was stirred at ambient temperature for 2 h. The reaction mixture was quenched with water (100.0 mL) and the solid was filtered. The solid was triturated with diethyl ether to afford 4-chloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (4.71 g, 83%) as a colourless solid: mp 210-225° C. (dec.); MS (ES+) m/z 304.1 (M+1), 302.1 (M+1).

Workup

  1. customThe reaction mixture was quenched with water (100.0 mL)
  2. filtrationthe solid was filtered
  3. customThe solid was triturated with diethyl ether

Sources & evidence

ORD record
ord-4a557c2e39da436fa3e64c60434d644c
Source dataset
uspto-grants-2013_04
Patent number
US08415370B2

Reaction notes

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