Dimethylformamide → Methyl 4-(5-formylthiophen-2-yl)butanoate

HRID 874988

Reaction equation

HRID 874988 reaction equation
O=P(Cl)(Cl)Cl.[S:6]1[CH:10]=[CH:9][CH:8]=[C:7]1[CH2:11][CH2:12][CH2:13][C:14]([O:16][CH3:17])=[O:15].CN([CH:21]=[O:22])C>>[CH:21]([C:10]1[S:6][C:7]([CH2:11][CH2:12][CH2:13][C:14]([O:16][CH3:17])=[O:15])=[CH:8][CH:9]=1)=[O:22]

Participants

4

Reactant 3

HCID 6228DimethylformamideHCID 24813Phosphorus oxychlorideHCID 1407664-(2-Thienyl)butanoic acid methyl ester

Product 1

HCID 53861603Methyl 4-(5-formylthiophen-2-yl)butanoateYield 83%

Conditions

Temperature
110 °C

Procedure

Freshly distilled POCl3 (0.4 MI, 4.12 mmol) was added to a solution of methyl 4-(thiophen-2-yl)butanoate (1.1 g, 5.97 mmol) in dry DMF (0.7 MI) at 0° C. The reaction mixture was further heated to 110° C. for 1.5 h, then cooled to room temperature and quenched with ice water. The Ph of the reaction mixture was adjusted to ˜7 using aqueous Na2CO3 solution. The organic product was extracted with diethyl ether and the combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure to get methyl 4-(5-formylthiophen-2-yl)butanoate (1.0 g, yield 83%), which was carried through without further purification. 1H NMR (300 MHz, CDCl3) δ 9.82 (s, 1H), 7.63-7.61 (d, J=3.7 Hz, 1H), 6.94-6.92 (m, 1H), 3.68 (s, 3H), 2.96-2.91 (t, J=7.5 Hz, 2H), 2.42-2.37 (m, 2H), 2.09-1.99 (m, 2H). MS (ESI) m/z: Calculated for C10H12O3S: 212.05. found: 212.9 (M+H)+

Workup

  1. temperaturecooled to room temperature
  2. customquenched with ice water
  3. extractionThe organic product was extracted with diethyl ether
  4. washthe combined extracts were washed with water and brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-99909b34a1474435855dd16a9d717088
Source dataset
uspto-grants-2015_03
Patent number
US08981084B2

Linked notes

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