Hydrochloric Acid → toluene-4-sulfonic acid (S)-2-tert-butoxycarbonylamino-4-methyl-pentyl ester

Participants

Reaction Steps

To a solution of 4.50 g of Boc-L-leucinol in 30 ml of THF were added 4.74 g of p-toluenesulfonylchloride, 7.2 ml of TEA and 0.25 g of DMAP. The reaction was stirred at rt overnight. The pH of the reaction was then adjusted to 6 by the addition of 1 M aqueous hydrochloric acid. The phases were separated and the aqueous phase was extracted with ethyl acetate twice. The combined organic layers were dried over sodium sulphate and concentrated to yield 6.94 g of toluene-4-sulfonic acid (S)-2-tert-butoxycarbonylamino-4-methyl-pentyl ester.

Provenance & Evidence