반응 #2719

반응 방정식

2-methylthiophene

n-BuLi

2,2-dimethyl-6-bromo-thiochroman-4-one

Compound M

2,2-dimethyl-6-bromo-thiochroman-4-one

→

title compound

2,2-Dimethyl-4(2-methyl-thien-5-yl)-6-bromo-thiochrom-3-ene

용매

THF

hexane

THF

ether

반응 조건

후처리

1. 1
   기타was recooled to -78° C.
2. 2
   workup.STIRRINGThe mixture was stirred for 16 hours at ambient temperature
3. 3
   세척washed with water (10 mL), brine (10 mL)
4. 4
   기타dried
5. 5
   기타the solvent was removed by evaporation
6. 6
   기타The product was seperated by column chromatography
7. 7
   workup.DISSOLUTIONwas dissolved in dichloromethane (5 mL)
8. 8
   workup.ADDITIONTo this solution p-TSA (5 mg) was added
9. 9
   workup.STIRRINGthe mixture was stirred at ambient temperature for 5 min
10. 10
    기타The reaction was quenched with 10% NaHCO3 (3 mL)
11. 11
    세척washed with brine (5 mL)
12. 12
    기타dried
13. 13
    기타the solvent was removed by distillation
14. 14
    기타The residual crude material was purified by column chromatography

실험 절차

To a cold (-78° C.) solution of 2-methylthiophene (1.2 g, 12.2 mmol) in THF (8 mL) was added n-BuLi in hexane (1.6M, 8.5 mL). The mixture was warmed to ambient temperature over 30 minutes. with stirring. The mixture was recooled to -78° C. and a solution of 2,2-dimethyl-6-bromo-thiochroman-4-one (Compound M, 1.4 g, 5.2 mmol) in THF (10 mL) was added. The mixture was stirred for 16 hours at ambient temperature. Then the reaction mixture was diluted with ether (125 mL), washed with water (10 mL), brine (10 mL) dried and the solvent was removed by evaporation. The product was seperated by column chromatography and was dissolved in dichloromethane (5 mL). To this solution p-TSA (5 mg) was added and the mixture was stirred at ambient temperature for 5 min. The reaction was quenched with 10% NaHCO3 (3 mL), washed with brine (5 mL), dried and the solvent was removed by distillation. The residual crude material was purified by column chromatography to obtain the title compound as a pale yellow oil.

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