Synthesis of Cyclosporine. Part II. Synthesis of Boc-D-Ala-MeLeu-MeLeu-MeVal-OH, a part of the peptide sequence of cyclosporine, by different strategic ways and synthesis of its isomers Boc-D-Ala-MeLeu-D-MeLeu-MeVal-OH, Boc-D-MeLeu-DMeVal-OH, and Boc-D-Ala-MeLeu-MeLeu-D-MeVal-OH as reference compounds
作者:Roland M. Wenger
DOI:10.1002/hlca.19830660836
日期:1983.12.14
Boc-D-Ala-MeLeu-MeLeu-MeVal-OH (DLLL) and itsisomers DLDL, DLDD and DLLD were synthesized using several differentstrategic approaches and a modification of the mixed pivalic anhydride method for carboxyl activation. Alternatively, the tert-butoxy-carbonyl (Boc) or benzyloxycarbonyl (Z) amino-protecting groups and the benzyloxy (OBzl) or tert-butoxy (OtBu) carboxyl-protecting groups were used to protect