Br[C:2]1[CH:14]=[CH:13][C:5]([O:6][CH:7]2[CH2:12][CH2:11][O:10][CH2:9][CH2:8]2)=[CH:4][CH:3]=1.C([Li])CCC.[S:20](Cl)([Cl:23])(=[O:22])=[O:21]>O1CCCC1.CCCCCC>[O:10]1[CH2:11][CH2:12][CH:7]([O:6][C:5]2[CH:13]=[CH:14][C:2]([S:20]([Cl:23])(=[O:22])=[O:21])=[CH:3][CH:4]=2)[CH2:8][CH2:9]1To a solution of 2.8 g of 4-(4-Bromo-phenoxy)-tetrahydropyran in 75 mL of dry tetrahydrofuran was added 7.5 mL of n-butyllithium (1.6 N in hexane) at −78° C. After stirring at −78° C. for 2 hours the reaction mixture was allowed to warm to −40° C. and a solution of 4.1 mL of sulfuryl chloride in 75 mL of dry hexane was added within 15 minutes. Stirring was continued for 1 hour at −30° C. and subsequently for another hour at 5° C. The mixture was poured on ice, extracted with diethyl ether and the ether extract washed with cold water and brine, dried (sodium sulfate), and concentrated. The residue was purified by silica chromatography (isohexane/ethyl acetate=4/1) yielding 0.62 g of 4-(tetrahydropyran-4-yloxy)-benzenesulfonyl chloride as a colorless oil. EI-MS: 276 (M+).
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