H. Nedev et al., A CONVENIENT METHOD FOR SYNTHESIS OF FMOC-AMINO ACID P-NITROANILIDES BASED ON ISOBUTYL CHLOROFORMATE AS A CONDENSATION AGENT, Tetrahedron letters, 34(26), 1993, pp. 4201-4204
Mixed anhydride method with condensation agent isobutyl chloroformate
is described for obtaining a series of p-nitroanilides of FMOC-Pro-, F
MOC-Ala-, FMOC-Leu-, FMOC-Ile, FMOC-Trp-, FMOC-Asp(OtBu)-, FMOC-Gln(Tr
t)-, FMOC-Hyp- and FMOC-Hyp(OtBu)- in good yields and in an optical pu
re form. The use of other activating agents for obtaining p-nitroanili
des is discussed.