Hydrochloric Acid → (Z)-3-(2-hydroxaminoethyl)-5-fluoro-2-methyl-1-(4-methylthiobenzylidene)indene

HRID 1420723Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)/[C:7](=[CH:11]\[C:12]1[CH:17]=[CH:16][C:15]([S:18][CH3:19])=[CH:14][CH:13]=1)/[C:6]([CH3:20])=[C:5]2[CH2:21][CH:22]=[N:23][OH:24].B.N1C=CC=CC=1.Cl>C(O)C>[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)/[C:7](=[CH:11]\[C:12]1[CH:17]=[CH:16][C:15]([S:18][CH3:19])=[CH:14][CH:13]=1)/[C:6]([CH3:20])=[C:5]2[CH2:21][CH2:22][NH:23][OH:24]

Participants

Conditions

Temperature: 0 °C

Procedure

To a suspension of the oxime from Step 3 (2.0 g, 5.9 mmol) in ethanol (35 mL) at 0° C. there was added pyridine-borane (1.1 g, 11.8 mmol) and 12 N aqueous HCl (1.48 mL, 17.75 mmol). The mixture was stirred at 0° C. for 1 hour, then warmed to room temperature. Most of the ethanol was evaporated, the residue was diluted with water and ethyl acetate (the product as hydrochloride salt remains in the organic phase) and was basified with 1N aqueous NaOH. The product obtained from the organic phase was triturated with hexane and was filtered to afford the title compound as a yellow solid, mp: 126° C. dec.

Workup

temperaturewarmed to room temperature
customMost of the ethanol was evaporated
additionthe residue was diluted with water and ethyl acetate (the product as hydrochloride salt
customThe product obtained from the organic phase
customwas triturated with hexane
filtrationwas filtered

Sources & evidence

ORD record: ord-c067d165c4074748bc1f5d6c587fdfbf
Source dataset: uspto-grants-2000_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06071934

Reaction notes

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