Studies on Peptides, XXXIX. N-Isobutoxycarbonyl-2-alkoxy-1, 2-dihydroquinoline Derivatives, as Coupling Reagents in Peptide Synthesis

N-Isobutoxycarbonyl-2-isobutoxy-1, 2-dihydroquinoline and two other analogous derivatives, N-isobutoxycarbonyl-2-methoxy-1, 2-dihydroquinoline and N-isobutoxycarbonyl-2-ethoxy-1, 2-dihydroquinoline, have been used as coupling reagents for peptide synthesis.