Aluminium lithium hydride → HCID 90418457, compound

Temperature

0 °C

Into a 100-mL 3-necked round-bottom flask (1 atm) purged and maintained with an inert atmosphere of nitrogen, was placed ethyl 4-(4-chlorophenyl)-2-(trifluoromethyl)thiophene-3-carboxylate (1.222 g, 3.65 mmol, 1.00 equiv), tetrahydrofuran (5.0 g, 69.34 mmol, 18.99 equiv). This was followed by the addition of a solution of LiAlH4 (278 mg, 7.33 mmol, 2.01 equiv) in tetrahydrofuran (7.0 mL) dropwise with stirring at 0° C. The resulting solution was stirred for 2.0 h at 25° C. The reaction progress was monitored by LCMS/TLC (ethyl acetate/petroleum ether=1:6). The reaction was then quenched by the addition of 10 mL of water and 5 mL of 2N HCl. The resulting solution was extracted with 3×20 mL of ethyl acetate and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:4). This resulted in 0.9 g (84%) of [4-(4-chlorophenyl)-2-(trifluoromethyl)thiophen-3-yl]methanol as a white solid.

1. customInto a 100-mL 3-necked round-bottom flask (1 atm) purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. stirringThe resulting solution was stirred for 2.0 h at 25° C
4. customThe reaction was then quenched by the addition of 10 mL of water and 5 mL of 2N HCl
5. extractionThe resulting solution was extracted with 3×20 mL of ethyl acetate
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated under vacuum
8. customThis resulted in 0.9 g (84%) of [4-(4-chlorophenyl)-2-(trifluoromethyl)thiophen-3-yl]methanol as a white solid

ORD record

ord-00a03a61cec6434fab047ac9a94c5363

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09067898B1