N-(1-Carbobenzyloxy-5-phthalimidopentyl)-alpha-azaalanyl-(L)-proline-t-butyl ester → N-(1-Carboxy-5-phthalimidopentyl)-alpha-azaalanyl-(L)-proline-t-butyl ester

Participants

Reaction Steps

A solution of azapeptide ester 24 (0.402 g; 0.679 mmol) in ethyl acetate (5 ml) and acetic acid (0.2 ml) was hydrogenated with 110 mg of 10% Pd C for 18 hours. Filtration of catalyst and removal of solvent gave azapeptide 25 as a white foam (0.330 g). TLC (silica gel; EPAW 20:5:1:1) Rf=0.7. MS m/e 574 (M+, monotrimethylsilyl). NMR (CDCl3): δ1.42 (9H.s); 1.5-2.1 (10H,m); 3.00 (3H,s); 3.4-3.8 (5H,m); 4.3-4.6 (1H,m); 7.6-7.8 (4H,m); 7.8-8.0 (1H, broad).

Provenance & Evidence