Benzyl chloroformate → HCID 57023645, compound

Participants

Reaction Steps

To a solution of 48.4 g of S-(o-nitrophenyl)-L-cysteine in 100 ml of 2N aqueous sodium hydroxide at 0° C. is added 28.8 ml of benzyl chloroformate and 50 ml of 4N aqueous sodium hydroxide simultaneously from two addition funnels. The mixture is mechanically stirred overnight at room temperature and then extracted with 150 ml of ether. The aqueous layer is separated and acidified to pH 1 with 12N aqueous hydrochloric acid. The resulting gummy yellow solid is stirred for 3 hr in 500 ml of water, collected by filtration, and dried overnight at 70° C. in vacuo to afford S-(o-nitrophenyl)-N-carbobenzyloxy-L-cysteine; m.p. 84°-88° C.; [α]D =+46.6° (c=1.25, methanol).

Provenance & Evidence