| abstract |
(57) [Summary] [Structure] Formula [Chemical Formula 1] Wherein R 1 is alkyl having 1 to 10 carbon atoms, Alkenyl having up to 4 carbon atoms, phenyl, benzyl or phenethyl, R 2 is hydrogen, benzyl or alkyl having 1 to 6 carbon atoms, R 2 3 and R 4 are the same or different, and each is hydrogen or a protecting group, and R 5 and R 6 are the same or different, and each has the meaning given for R 3 and R 4. Having 2,3-diamino acids. [Effect] It is useful as an intermediate for the synthesis of peptide active substances, particularly renin inhibitors and HIV protease inhibitors. |