Triethylamine → 4-{2-[2-(3-But-3-enyloxy-5-trifluoromethyl-phenyl)-4-oxo-1,3,8-triaza-spiro[4.5]dec-1-ene-8-sulfonyl]-ethyl}-3-methyl-benzoic acid methyl ester

Participants

Reaction Steps

Triethylamine (1.27 ml, 9.11 mmol) and 4-(2-chlorosulfonyl-ethyl)-3-methyl-benzoic acid methyl ester (1.01 g, 3.65 mmol) were added to a solution of 2-(3-but-3-enyloxy-5-trifluoromethyl-phenyl)-1,3,8-triaza-spiro[4.5]dec-1-en-4-one (1.40 g, 3.83 mmol) in methylene chloride (35 ml) at 0° C. The mixture was stirred at room temperature for two hours, and then quenched with a saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous sodium sulfate and then concentrated under reduced pressure to give 4-{2-[2-(3-but-3-enyloxy-5-trifluoromethyl-phenyl)-4-oxo-1,3,8-triaza-spiro[4.5]dec-1-ene-8-sulfonyl]-ethyl}-3-methyl-benzoic acid methyl ester (2.10 g). This compound was used in the next reaction without further purification.

Provenance & Evidence