Jchm. Wijkmans et al., CF3-BOP, CF3-PYBOP AND CF3-HBTU - NEW PEPTIDE COUPLING REAGENTS SPECIALLY SUITED FOR ALPHA-AMINOISOBUTYRIC-ACID CONDENSATIONS, Recueil des travaux chimiques des Pays-Bas, 113(9), 1994, pp. 394-397
The peptide-coupling reagents CF3-BOP (1b), CF3-PyBOP (1c) and CF3-HBT
U (2a) with built-in 1-hydroxy-6-(trifluoromethyl)benzotriazole proved
to be highly efficient for the coupling of alpha-aminoisobutyric acid
residues.