Sodium Hydroxide → N-(7-fluoro-4-methoxy-1-benzothien-2-yl)-N,N-dimethylamine

HRID 1822956Notes

Reaction equation

[F:1][C:2]1[CH:3]=[CH:4][C:5]([O:15][CH3:16])=[C:6]([CH:8](O)[C:9](=[S:13])[N:10]([CH3:12])[CH3:11])[CH:7]=1.[OH-].[Na+]>CS(O)(=O)=O.O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O>[F:1][C:2]1[C:7]2[S:13][C:9]([N:10]([CH3:12])[CH3:11])=[CH:8][C:6]=2[C:5]([O:15][CH3:16])=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 60 °C

Procedure

A solution of 2-(5-fluoro-2-methoxyphenyl)-2-hydroxy-N,N-dimethylethanethioamide (0.5 g, 2.1 mmol) in Eaton's reagent (5 mL) were combined and heated rapidly to 60° C. and left for 1 h. After cooling to room temperature over 2 hours the mixture was dropwise addition into prechilled aqueous sodium hydroxide (2 N, 16.25 mL) with constant stirring. This solution was then extracted with methyl tert-butyl ether (5×20 mL) and the combined organic extracts were dried (MgSO4) and the solvent removed in vacuo to give a yellow solid. This was purified by flash chromatography with a gradient of 0–2% diethyl ether in hexane and gave 0.2 g of yellow solid containing an impurity, this was triturated with hexane to leave a colourless solid (0.155 g, 34%) of the title compound; δH (300 MHz, CDCl3) 6.70–6.52 (2H, m, ArH), 6.12–6.10 (1H, m, ArH) 3.90 (3H, s, OCH3) and 3.2 (6H, s, N(CH3)2), M+H=226.1.

Workup

temperatureAfter cooling to room temperature over 2 hours the mixture
extractionThis solution was then extracted with methyl tert-butyl ether (5×20 mL)
dry with materialthe combined organic extracts were dried (MgSO4)
customthe solvent removed in vacuo
customto give a yellow solid
customThis was purified by flash chromatography with a gradient of 0–2% diethyl ether in hexane

Sources & evidence

ORD record: ord-ad2f985eb0c84ba9bddffd2e305fb654
Source dataset: uspto-grants-2006_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07037932B2

Reaction notes

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