Formaldehyde → HCID 71278598, compound

HRID 1749703Notes

Reaction equation

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

Participants

Conditions

Temperature: 80 °C

Procedure

A solution of (Z)-2-[(1H-indol-3-yl)methylene]-6-hydroxybenzofuran-3(2H)-one (0.030 g, 0.11 mmol) obtained in Example A1, Step 1 in ethanol (3.0 mL) was added with 2-oxopiperazine (0.013 g, 0.13 mmol), and 37% aqueous formaldehyde (0.011 g, 0.13 mmol), and the mixture was stirred overnight at 80° C. in a sealed tube. The solvent was evaporated under reduced pressure, and then the residue was subjected to silica gel column chromatography (aminopropyl silica was used, eluted with chloroform/methanol (90:10)) to obtain (Z)-4({2-[(1H-indol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazin-2-one (0.012 g, 28%).

Workup

customThe solvent was evaporated under reduced pressure
washthe residue was subjected to silica gel column chromatography (aminopropyl silica was used, eluted with chloroform/methanol (90:10))

Sources & evidence

ORD record: ord-766c0f078407499db6cb449028903e20
Source dataset: uspto-grants-2015_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09156827B2

Reaction notes

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