Y. Fujiwara et al., RACEMIZATION-FREE SYNTHESIS OF C-TERMINAL CYSTEINE-PEPTIDE USING 2-CHLOROTRITYL RESIN, Chemical and Pharmaceutical Bulletin, 42(3), 1994, pp. 724-726
We investigated the effects of bases, resins, and S-protecting groups
on the extent of racemization at the C-terminal cysteine during Fmoc-b
ased(Fmoc=fluoren-9-yl-methoxy-carbonyl) solid phase peptide synthesis
. The use of 2-chlorotrityl resin was most effective in suppressing th
e racemization caused by the base treatment for Fmoc-cleavage. Somatos
tatin was successfully synthesized with practically no racemization us
ing 2-chlorotrityl resin by Fmoc-chemistry.