Z-Thr(tBu)-OSU → Z-Thr(tBu)-Ala-Ile-Gly-OMe

Participants

Reaction Steps

1.36 g of H-Ala-Ile-Gly-OMe (compare Example 1) and 2.5 g of Z-Thr(tBu)-OSU in 3 ml of dimethylformamide are stirred for 20 hours at room temperature. The tetrapeptide derivative is precipitated by ether, filtered off and washed with ether. After recrystallisation from ethanol the melting point is 229°-230° C. [α]D20 = -43° (c = 1 in methanol). Rf = 0.55 in the system chloroform-methanol (95:5) on silica gel.

Provenance & Evidence