Triethylamine → 1-(tert-Butoxycarbonyl)-4-(methanesulfonyloxy)piperidine

Participants

Reaction Conditions

Reaction Steps

To 300 ml of an ethyl acetate solution containing 30.00 g of N-t-butoxycarbonyl-4-hydroxypiperidine and 41.6 ml of triethylamine was added dropwise 17.3 ml of mesyl chloride at −10° C. over 10 minutes. The temperature increased to 5° C. due to heat generation. After stirring with cooling in an ice bath for 10 minutes, 90 ml of water was carefully added dropwise to the reaction mixture. The temperature increased from 0° C. to 6° C. due to heat generation. After stirring for 10 minutes, the mixture was separated and the organic phase washed with water (90 ml×2), saturated saline (90 ml), water (90 ml) and saturated saline (90 ml) in this order. After drying with anhydrous magnesium sulfate, concentration was conducted under reduced pressure and 40.74 g of 1-t-butoxycarbonyl-4-mesyloxypiperidine was obtained.

Provenance & Evidence