Hydrochloric Acid → 5-Methyl-2-sulfanylbenzaldehyde

Temperature

0 °C

Tetramethylethylenediamine (TMEDA)(12.6 mL, 83.5 mmol) was added via syringe to n-BuLi (33 mL of 1.6 M in hexanes, 82.5 mmol) and the solution was chilled to 0° C. A solution of p-thiocresol (4.53 g, 36.5 mmol) in cyclohexane (40 mL) was added with stirring over 5 minutes. The resulting tan slurry was stirred overnight at room temperature, chilled to 0° C., and DMF (4.0 mL, 3.77 g, 51.6 mmol) was added via syringe over 2 minutes. The resulting gummy slurry was stirred at room temperature for 1.3 hours. The reaction mixture was added to 3 N HCl (150 mL). This mixture was extracted with ethyl acetate. The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated in vacuo yielding a brown oil. This oil was purified by flash chromatography over silica gel, eluting with 10% ethyl acetate-hexanes to afford 5-methyl-2-mercaptobenzaldehyde (4.47 g, 69%) as an intensely yellow solid suitable for use without further purification.

1. stirringThe resulting tan slurry was stirred overnight at room temperature
2. temperaturechilled to 0° C.
3. stirringThe resulting gummy slurry was stirred at room temperature for 1.3 hours
4. extractionThis mixture was extracted with ethyl acetate
5. washThe combined organic layers were washed with brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customyielding a brown oil
10. customThis oil was purified by flash chromatography over silica gel
11. washeluting with 10% ethyl acetate-hexanes

ORD record

ord-61cb646eae0d407091809caf62059e8a

Source dataset

uspto-grants-2002_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06492390B2