Formaldehyde → 6-(4-Phenethylbenzoyl)-2-(1-pyrrolidinylmethyl)-4,5,6,7-tetrahydrofuro[2,3-c]pyridine

HRID 611354Notes

Reaction equation

[CH2:1]([C:9]1[CH:25]=[CH:24][C:12]([C:13]([N:15]2[CH2:20][CH2:19][C:18]3[CH:21]=[CH:22][O:23][C:17]=3[CH2:16]2)=[O:14])=[CH:11][CH:10]=1)[CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[NH:26]1[CH2:30][CH2:29][CH2:28][CH2:27]1.[CH2:31]=O>C(O)(=O)C>[CH2:1]([C:9]1[CH:25]=[CH:24][C:12]([C:13]([N:15]2[CH2:20][CH2:19][C:18]3[CH:21]=[C:22]([CH2:31][N:26]4[CH2:30][CH2:29][CH2:28][CH2:27]4)[O:23][C:17]=3[CH2:16]2)=[O:14])=[CH:11][CH:10]=1)[CH2:2][C:3]1[CH:4]=[CH:5][CH:6]=[CH:7][CH:8]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a solution of 1.078 g (3.253 mmol) of the above 6-(4-phenethylbenzoyl)-4,5,6,7-tetrahydrofuro[2,3-c]pyridine in 10 ml of acetic acid, 0.41 ml (4.88 mmol) of pyrrolidine and 0.40 g (4.88 mmol) of 37% aqueous formaldehyde were added, followed by stirring at 100° C. for 1 hour. After the solvent was distilled off under reduced pressure, the residual solution was alkalified with aqueous sodium hydroxide and extracted with ethyl acetate 3 times. The combined organic layer was dried over anhydrous magnesium sulfate; the solvent was distilled off under reduced pressure. The resulting crude product was purified by silica gel column chromatography (ethyl-acetate to ethyl acetate/methanol=4/1) to yield the desired product.

Workup

distillationAfter the solvent was distilled off under reduced pressure
extractionextracted with ethyl acetate 3 times
dry with materialThe combined organic layer was dried over anhydrous magnesium sulfate
distillationthe solvent was distilled off under reduced pressure
customThe resulting crude product was purified by silica gel column chromatography (ethyl-acetate to ethyl acetate/methanol=4/1)

Sources & evidence

ORD record: ord-772ba03ba3b246459d6fb1cae2c33bb9
Source dataset: uspto-grants-1999_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05998433

Reaction notes

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