4-Toluenesulfonyl chloride → (2S)-(4E)-5-(3-pyridyl)-4-penten-2-ol p-toluenesulfonate

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Reaction Steps

Under a nitrogen atmosphere, p-toluenesulfonyl chloride (7.01 g, 36.77 mmol) was added to a stirring solution of (2S)-(4E)-5-(3-pyridyl)-4-penten-2-ol (3.00 g, 18.38 mmol) in dry triethylamine (20 mL) at 0° C. After stirring and warning to ambient temperature over 18 h, the mixture was stirred with cold, saturated NaHCO3 solution (50 mL) for 1 hour and extracted with chloroform (3×50 mL). The combined chloroform extracts were dried (K2CO3), filtered, and concentrated by rotary evaporation to afford a thick, dark-brown mass (˜7 g). The crude product was purified by column chromatography on silica gel, eluting with chloroform-acetone (98:2, v/v) to afford 4.00 g (68.6%) of a light-brown syrup.

Provenance & Evidence