Methyl 5-bromothiophene-2-carboxylate → 5-(3-tert-Butoxycarbonylamino-prop-1-ynyl)-thiophene-2-carboxylic Acid Methyl Ester

HRID 842734

Reaction equation

HRID 842734 reaction equation
[C:1]([O:5][C:6](=[O:11])[NH:7][CH2:8][C:9]#[CH:10])([CH3:4])([CH3:3])[CH3:2].[CH3:12][O:13][C:14]([C:16]1[S:17][C:18](Br)=[CH:19][CH:20]=1)=[O:15]>C(#N)C.CCOC(C)=O.C(N(CC)CC)C>[CH3:12][O:13][C:14]([C:16]1[S:17][C:18]([C:10]#[C:9][CH2:8][NH:7][C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:11])=[CH:19][CH:20]=1)=[O:15]

Participants

6

Reactant 2

HCID 605713Methyl 5-bromothiophene-2-carboxylateHCID 11073648tert-butyl N-(prop-2-yn-1-yl)carbamate

Product 1

HCID 540753395-(3-tert-Butoxycarbonylamino-prop-1-ynyl)-thiophene-2-carboxylic Acid Methyl EsterYield 63,406.199%

Reagents, catalysts & solvents 3

HCID 8471TriethylamineCatalystHCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of prop-2-ynyl-carbamic acid tert-butyl ester (1.67 g, 0.011 mmol), 5-bromo-thiophene-2-carboxylic acid methyl ester (2.50 g, 0.011 mmol), tetrakistriphenylphosphine(0) palladium (0.622 9, 0.0538 mmol), Cul (0.102 g, 0.538 mmol) and triethylamine (1.57 mL, 0.011 mmol) in 50 mL acetonitrile was heated at reflux for 16 h. The reaction was cooled to room temperature, diluted with 75 mL EtOAc, washed with 5.5% HCl, water and brine, dried over MgSO4, filtered and concentrated in vacuo to an oil. The product was purified via flash chromatography (9:1 to 4:1 hexanes:EtOAc) to afford the title compound as an oil (2.06 g). MS 313 (M+18).

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 16 h
  3. washwashed with 5.5% HCl, water and brine
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo to an oil
  7. customThe product was purified via flash chromatography (9:1 to 4:1 hexanes:EtOAc)

Sources & evidence

ORD record
ord-73c16622ab3c4a548911a8e84df0f09f
Source dataset
uspto-grants-2002_04
Patent number
US06376502B1

Linked notes

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