Hydrazine hydrate (1:1) → 2-Hydrazino-7-hydroxy-6-methoxy-3-(3,4,5-trimethoxybenzoyl)-benzofuran

HRID 529243Notes

Reaction equation

Br[C:2]1[O:3][C:4]2[C:24]([O:25]C(=O)C)=[C:23]([O:29][CH3:30])[CH:22]=[CH:21][C:5]=2[C:6]=1[C:7](=[O:20])[C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=1.O.[NH2:32][NH2:33]>O1CCCC1>[NH:32]([C:2]1[O:3][C:4]2[C:24]([OH:25])=[C:23]([O:29][CH3:30])[CH:22]=[CH:21][C:5]=2[C:6]=1[C:7](=[O:20])[C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=1)[NH2:33]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of the 2-Bromo-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxybenzofuran (30 mg, 0.062 mmol) in tetrahydrofuran (0.5 ml) was added hydrazine monohydrate (15 μL, 0.3 mmol). A yellow precipitate immediately formed and the heterogeneous mixture was heated to 60° C. for 1 hour during which time more solid separated from the reaction. After cooling, the solid product was collected by filtration, washed with ether and dried under vacuum (6 mg, 25%); 1H NMR (d6-DMSO) δ 9.70 (br s, 1H), 9.27 (br s, 1H), 6.85 (s, 2H), 6.68 (d, J=8.5 Hz, 1H), 6.21 (d, J=8.5 Hz, 1H), 5.00 (br s, 2H), 3.73 (s, 6H), 3.71 (s, 3H), 3.70 (s, 3H).

Workup

customA yellow precipitate immediately formed
customseparated from the reaction
temperatureAfter cooling
filtrationthe solid product was collected by filtration
washwashed with ether
customdried under vacuum (6 mg, 25%)

Sources & evidence

ORD record: ord-54e9f36ed501465ea621e22e3e8fd9fb
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09346842B2

Reaction notes

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