Methyl 4-Formylbenzoate → HCID 69492813, compound

HRID 1270209Notes

Reaction equation

HRID 1270209 reaction equation
[C:1]([C:3]1[C:4]([O:16][CH3:17])=[CH:5][C:6]([O:14][CH3:15])=[C:7]([C:9]2[S:10][CH:11]=[CH:12][CH:13]=2)[CH:8]=1)#[CH:2].C([Li])CCC.[CH:23]([C:25]1[CH:34]=[CH:33][C:28]([C:29]([O:31][CH3:32])=[O:30])=[CH:27][CH:26]=1)=[O:24]>C1COCC1>[CH3:32][O:31][C:29](=[O:30])[C:28]1[CH:33]=[CH:34][C:25]([CH:23]([OH:24])[C:2]#[C:1][C:3]2[CH:8]=[C:7]([C:9]3[S:10][CH:11]=[CH:12][CH:13]=3)[C:6]([O:14][CH3:15])=[CH:5][C:4]=2[O:16][CH3:17])=[CH:26][CH:27]=1

Participants

5

Reactant 3

HCID 15294Methyl 4-FormylbenzoateHCID 18449299HCID 18449299, compoundHCID 178418339Butyllithium

Product 1

HCID 69492813HCID 69492813, compoundYield 88%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
0 °C

Procedure

Ex-1C: A solution of 2-(5-ethynyl-2,4-dimethoxy-phenyl)-thiophene (1.5 g, 6.14 mmol) from Ex-1B in THF (20 mL) was cooled to −78° C. n-Butyllithium (6.72 mmol, 4.2 mL of a 1.6 M solution in hexanes) was added dropwise while maintaining an internal temperature below −65° C. After aging for 30 min at −78° C., the reaction was transferred via cannula over 10 min to a cold (−78° C.) solution of methyl 4-formylbenzoate (1.07 g, 6.52 mmol) in THF (10 mL). The resulting solution was slowly warmed to 0° C. and then quenched with a saturated NH4Cl solution. The layers were separated, and the aqueous layer was extracted with ethyl acetate. The combined organic phases were dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. Silica gel chromatography (hexane/ethyl acetate, 3:1, 1:1) gave 2.2 g (88%) of the desired 4-[3-(2,4-dimethoxy-5-thiophen-2-yl-phenyl)-1-hydroxy-prop-2-ynyl]-benzoic acid methyl ester as a greenish yellow solid, m.p. 128–130° C. 1H-NMR (300 MHz, CDCl3) d 8.08 (d, 2H, J=8.3 Hz), 7.75 (d, 2H, J=8.3 Hz), 7.68 (s, 1H), 7.37 (dd, 1H, J=3.6 and 1.7 Hz), 7.28 (dd, 1H, J=5.1 and 1.7 Hz), 7.06 (dd, 1H, J=5.1 and 3.6 Hz), 5.79 (d, 1H, J=6.6 Hz), 3.96 (s, 3H), 3.94 (s, 3H), 3.93 (s, 3H), 2.53 (d, 1H, J=6.6 Hz).

Workup

  1. additionwas added dropwise
  2. temperaturewhile maintaining an internal temperature below −65° C
  3. customquenched with a saturated NH4Cl solution
  4. customThe layers were separated
  5. extractionthe aqueous layer was extracted with ethyl acetate
  6. dry with materialThe combined organic phases were dried over anhydrous magnesium sulfate
  7. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-5d15ef8b96f64eb98ce2407329d03c36
Source dataset
uspto-grants-2007_04
Patent number
US07202247B2

Reaction notes

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