Dicyclohexylcarbodiimide → HCID 13501924, compound

Participants

Reaction Steps

A solution of Ac-Ser(tBu)-Asp(OtBu)-Ala-OH (24.7 g, 55.4 mmol) in dry THF (526 mL) was treated with HOSu (9.55 g, 83.1 mmol, 1.5 eq.) and cooled to 0°. To the cold stirring (mechanical) solution DCC (17.14 g, 83.1 mmol, 1.5 eq.) was added portionwise and stirring proceeded at 0° for 30 min at 25° for 5 h. The reaction mixture was filtered and the filtrate evaporated to dryness and crystallized from isopropanol (250 mL). Yield: 23.2 g (77.2%); mp 155°-157°; [α]D25 -41.48° (c 1, MeOH); Rf 0.54 (CHCl3 :MeOH:AcOH; 80-5-1). Anal. calc. for C24H38N4O10 (542.58): C, 53.13; H, 7.06; N, 10.33. Found: C, 53.21; H, 6.85; N, 10.29.

Provenance & Evidence