M. Alpegiani et al., TRICYCLIC CEPHEMS AS INHIBITORS OF HUMAN-LEUKOCYTE ELASTASE - THIENO[3,4-C]CEPHAM SULFONES AND PYRROLO[3,4-C]CEPHAM SULFONES, Bioorganic & medicinal chemistry letters, 5(7), 1995, pp. 691-694
Thieno- and pyrrolo[3,4-c]cepham sulfones were synthesized and compare
d to their furo analogs for activity as human leukocyte elastase inhib
itors, Pyrrolo derivatives, especially when N-alkylated, combined exce
llent hydrolytic stability with remarkable inhibitory activity.