D. Zicane et al., SIDE REACTIONS IN THE PYROGLUTAMIC ACID-7-AMINO-4-METHYLCOUMARIN SYNTHESIS, International journal of peptide & protein research, 48(1), 1996, pp. 56-58
N-Formylpyroglutamic acid-7-amido-4-methylcoumarine and pyroglutamyl-p
yroblutamic acid-7-amido-4-methylcoumarin are the major products in th
e synthesis of pyroglutamic acid-7-amido-4-methylcoumarin by phosphoru
s pentachloride in dimethylformamide and dicyclohexylcarbodiimide unde
r pyridine activation. (C) Munksgaard 1996.