Triethylamine → 7-Hydroxy-2-phenyl-4-trimethylsilanylethynyl-thiazolo[4,5-c]pyridine-6 carboxylic acid ethyl ester

HRID 642375Notes

Reaction equation

HRID 642375 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:11]=[C:10](Br)[C:9]2[N:13]=[C:14]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[S:15][C:8]=2[C:7]=1[OH:22])=[O:5])[CH3:2].[CH3:23][Si:24]([C:27]#[CH:28])([CH3:26])[CH3:25].C(N(CC)CC)C>O1CCCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu]I>[CH2:1]([O:3][C:4]([C:6]1[N:11]=[C:10]([C:28]#[C:27][Si:24]([CH3:26])([CH3:25])[CH3:23])[C:9]2[N:13]=[C:14]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[S:15][C:8]=2[C:7]=1[OH:22])=[O:5])[CH3:2]

Participants

7

Reactant 3

HCID 8471TriethylamineHCID 66111TrimethylsilylacetyleneHCID 866173544-Bromo-7-hydroxy-2-phenyl-thiazolo[4,5-c]pyridine-6-carboxylic acid ethyl ester

Product 1

HCID 684262687-Hydroxy-2-phenyl-4-trimethylsilanylethynyl-thiazolo[4,5-c]pyridine-6 carboxylic acid ethyl esterYield 67.2%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 8028TetrahydrofuranSolvent

Procedure

A mixture of 4-bromo-7-hydroxy-2-phenyl-thiazolo[4,5-c]pyridine-6-carboxylic acid ethyl ester (636 mg, 1.68 mmole), trimethylsilylacetylene (309 μl, 2.19 mmole), bis(triphenylphosphine)palladium chloride (35 mg, 0.05 mmole), copper(I) iodide (19 mg, 0.10 mmole) and triethylamine (352 μl, 2.52 mmole) in tetrahydrofuran (3.4 ml) was stirred at room temperature for 3.5 h before it was partitioned between ethyl acetate and water, washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by column chromatography on silica gel with a gradient of dichloromethane and hexanes to give the title compound as a yellow solid (448 mg). MS: (+) m/z 397.28 (M+1), MS: (−) m/z 395.18 (M−1).

Workup

  1. customwas partitioned between ethyl acetate and water
  2. washwashed with brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by column chromatography on silica gel with a gradient of dichloromethane and hexanes

Sources & evidence

ORD record
ord-7b53fcbf2e104f03b32e47dbc508c1c4
Source dataset
uspto-grants-2010_04
Patent number
US07696223B2

Reaction notes

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