Hydrochloric Acid → 5-[3-(4-Trifluoromethyl-phenyl)-benzo[d]isothiazol-6-yl]-pent-4-yn-1-ol

HRID 347096Notes

Reaction equation

HRID 347096 reaction equation
[F:1][C:2]([F:27])([F:26])[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[C:13]3[CH:14]=[CH:15][C:16](OS(C(F)(F)F)(=O)=O)=[CH:17][C:12]=3[S:11][N:10]=2)=[CH:5][CH:4]=1.N1CCCCC1.[CH2:34]([OH:39])[CH2:35][CH2:36][C:37]#[CH:38].Cl>[Cu]I>[F:27][C:2]([F:1])([F:26])[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[C:13]3[CH:14]=[CH:15][C:16]([C:38]#[C:37][CH2:36][CH2:35][CH2:34][OH:39])=[CH:17][C:12]=3[S:11][N:10]=2)=[CH:5][CH:4]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 8082PiperidineHCID 793464-Pentyn-1-olHCID 57428077Trifluoro-methanesulfonic acid 3-(4-trifluoromethyl-phenyl)-benzo[d]isothiazol-6-yl ester

Product 1

HCID 223139015-[3-(4-Trifluoromethyl-phenyl)-benzo[d]isothiazol-6-yl]-pent-4-yn-1-olYield 96.8%

Reagents, catalysts & solvents 1

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)Catalyst

Procedure

To 3.3 g (7.72 mmol) Trifluoro-methanesulfonic acid 3-(4-trifluoromethyl-phenyl)-benzo[d]isothiazol-6-yl ester in 20 ml piperidine 447.0 mg (3.9 mmol) tetrakis(triphenylphosphine)palladium and 73.6 mg (3.9 mmol) CuI were added. At 80° C. 1.43 ml (15.45 mmol) 4-pentyn-1-ol were added slowly, and the solution was stirred for an additional hour. The cooled solution was added to ice water, acidified with 2M HCl and extracted with ether. The combined organic phases were washed with water and dried over Na2SO4. Column chromatography on silica gel with CH2Cl2:MeOH 30:1 yielded 2.7 g (96%) 5-[3-(4-Trifluoromethyl-phenyl)-benzo[d]isothiazol-6-yl]-pent-4-yn-1-ol as orange oil, MS: 361 (M).

Workup

  1. customAt 80° C
  2. extractionextracted with ether
  3. washThe combined organic phases were washed with water
  4. dry with materialdried over Na2SO4

Sources & evidence

ORD record
ord-60d3720f8d584c62a2680874fec47127
Source dataset
uspto-grants-2007_02
Patent number
US07173043B2

Reaction notes

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