Methyl iodide → 2-[5-(t-Butyldimethylsilyloxy)-1-[(4-chlorophenyl)sulfonyl]-1-methylpentyl]-1,4-difluorobenzene

In an argon gas stream and at −78° C., n-butyl lithium (a 1.57M hexane solution, 0.294 ml, 0.461 mmol) was added to a solution of 2-[5-(t-butyldimethylsilyloxy)-1-[(4-chlorophenyl)sulfonyl]pentyl]-1,4-difluorobenzene (205 mg, 0.419 mmol) in tetrahydrofuran (4 ml). The mixture was stirred at room temperature for 1 hour. After cooling to −78° C., iodomethane (0.339 ml, 0.545 mmol) was added dropwise to the reaction mixture and the mixture was stirred at room temperature for 4 hours. Water was added to the reaction mixture, followed by extraction with diethyl ether. The extracts were combined, washed successively with water and brine, dried over MgSO4, and then concentrated. The residue thus obtained was purified by medium-pressure chromatography on a silica gel column (6% ethyl acetate-hexane), whereby the title compound (168 mg, 80%) was obtained as a colorless oil.

1. temperatureAfter cooling to −78° C.
2. stirringthe mixture was stirred at room temperature for 4 hours
3. extractionfollowed by extraction with diethyl ether
4. washwashed successively with water and brine
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. customThe residue thus obtained
8. customwas purified by medium-pressure chromatography on a silica gel column (6% ethyl acetate-hexane), whereby the title compound (168 mg, 80%)
9. customwas obtained as a colorless oil

ORD-Eintrag

ord-b659264b21f44a739cc726da2536de98

Quelldatensatz

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07399775B2