Optimization of a 1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione series of HIV capsid assembly inhibitors 1: Addressing configurational instability through scaffold modification
作者:Lee D. Fader、Serge Landry、Sébastien Morin、Stephen H. Kawai、Yves Bousquet、Oliver Hucke、Nathalie Goudreau、Christopher T. Lemke、Pierre Bonneau、Steve Titolo、Stephen Mason、Bruno Simoneau
DOI:10.1016/j.bmcl.2013.03.073
日期:2013.6
The optimization of a 1,5-dihydrobenzo[b][1,4] diazepine-2,4-dione series of inhibitors of HIV-1 capsid assembly that possess a labile stereocenter at C3 is described. Quaternization of the C3 position of compound 1 in order to prevent racemization gave compound 2, which was inactive in our capsid disassembly assay. A likely explanation for this finding was revealed by in silico analysis predicting a dramatic increase in energy of the bioactive conformation upon quaternization of the C3 position. Replacement of the C3 of the diazepine ring with a nitrogen atom to give the 1,5-dihydro-benzo[f][1,3,5]-triazepine-2,4-dione analog 4 was well tolerated. Introduction of a rigid spirocyclic system at the C3 position gave configurationally stable 1,5-dihydrobenzo[b][1,4] diazepine-2,4-dione analog 5, which was able to access the bioactive conformation without a severe energetic penalty and inhibit capsid assembly. Preliminary structure-activity relationships (SAR) and X-ray crystallographic data show that knowledge from the 1,5-dihydrobenzo[ b][1,4] diazepine-2,4-dione series of inhibitors of HIV-1 capsid assembly can be transferred to these new scaffolds. (C) 2013 Elsevier Ltd. All rights reserved.