Triethylamine → HCID 131733610, compound

Participants

Reaction Steps

To a stirred solution of Boc-Trp-Pro-OH (76 gm) and triethylamine (18.5 ml) in methylene chloride (850 ml) at about 0° C. to about −10° C., was charged EDC (54.5 gm) and HOBT (28.5 gm). Stirred for 30 minutes and charged H-Cys(Trt)-NH2 (65 gm, obtained from Ex-12) in methylene chloride (750 ml) at same temperature. After completion of the reaction organic layer was subjected to washings with aqueous sodium bicarbonate, aqueous citric acid solution. The separated organic layer was concentrated under reduced pressure and the resultant residue was crystallized in isopropyl ether to obtain Boc-Trp-Pro-Cys(Trt)-NH2 as a white solid material.

Provenance & Evidence