jm051074u_si_001.pdf (12.74 kB)
Synthesis and Mixed Lineage Kinase Activity of Pyrrolocarbazole and Isoindolone Analogs of (+)K-252a
journal contribution
posted on 2007-02-08, 00:00 authored by Robert L. Hudkins, Neil W. Johnson, Thelma S. Angeles, George W. Gessner, John P. MallamoStructural modification of the indolecarbazole natural product (+)K-252a identified structural requirements
for MLK activity and a novel series of potent fused pyrrolocarbazole MLK1/3 inhibitors. The SAR revealed
that the lactam regiochemistry, the shape of the heterocycle, and aryl rings B and F are important to MLK
activity. Heteroatom and alkyl replacement of the N-12 and/or N-13 indole nitrogen atoms identified the
nonplanar dihydronaphthyl[3,4-a]pyrrolo[3,4-c]carbazole-7-one (8) and corresponding 5,7-dione (7) as potent
cell-permeable MLK1/3 family-selective leads with in vitro activity comparable to that of (+)K-252a and
determined them to be 2- to 3-fold more potent than the aglycone natural product K-252c.