Triethylamine → N-BOC-m-Benzoyl-L-Phenylalanine

Participants

Reaction Steps

A suspension of 2.175 g of m-benzoyl-L-phenylalanine in 25 ml of water and 1.15 g of triethylamine was treated with 3.35 g of BOC-ON in 40 ml of acetone. After 3 h, acetone was removed and the aqueous residue was extracted three times with ether (discarded). The aqueous solution was acidified to pH 2 with 1N hydrochloric acid and extracted with ethyl acetate. The extract was dried (MgSO4) and stripped. The residue was triturated for 7 days with petroleum ether. The waxy insoluble solid was triturated for 14 days with an additional portion of petroleum ether and finally for 7 days with a third portion. The resulting white solid weighed 1.786 g after vacuum drying, [α]D25 +22.2±0.9°, C=0.86 g/100 ml ethanol. Anal.: Calcd. for C21H23NO5 :C, 68.28; H, 6.28; N, 3.79. Found: C, 68.01; H, 6.49; N, 3.68.

Provenance & Evidence