Amides, lactams, microreactors, peptides, synthetic methods Various lactams as well as a cyclic peptide containing acid- and/or heat-labile functional groups were synthesized in good to high yields without tedious purifications. Keywords: amides; lactams; microreactors; peptides; synthetic methods EN amides lactams microreactors peptides synthetic methods 7468 7468 1 05/17/21 20210512 NES 210512 B Rapid (0.5 to 10 s), mild, inexpensive, and less wasteful lactamization b was achieved using highly electrophilic triphosgene in a micro-flow reactor.