An expeditious synthesis and anticancer activity of novel 4-(3′-indolyl)oxazoles
摘要:
A series of 4-(3'-indolyl)oxazole congeners have been synthesized and studied for their cytotoxicity against six cancer cell lines. Reaction of 3-acetyl-1'-benzenesulfonylindole with [hydroxy(tosyloxy)iodo]benzene afforded pure 3-tosyloxyacetyl-1'-benzenesuifonylindole. Microwave-accelerated neat reaction of 3-tosyloxyacetyl-1-benzenesulfonylindole with amides resulted in the exclusive formation of 4-(1'-benzenesulfonylindol-3'-yl)-2-substituted oxazoles (4) in very good yield. Treatment of 4 with aqueous sodium hydroxide under refluxing conditions afforded pure 4-(3'-indolyl)-2-substituted oxazoles (5) in excellent yield. The 4-(T-indolyl)oxazoles; 5d and 11 were found to be most cytotoxic and selective against various cancer cell lines. Compounds 5g, 5j and 51 showed moderate anticancer activity. (C) 2010 Elsevier Masson SAS. All rights reserved.
The present invention provides a oxazole compound represented by Formula (1), or a salt thereof:
wherein R
1
is an aryl group which may have one or more substituents; R
2
is an aryl group or a nitrogen atom-containing heterocyclic group each of which may have one or more substituents; and W is a divalent group represented by —Y
1
-A
1
- or —Y
2
—C(═O)— wherein Y
1
is a group such as —C(═O)—, A
1
is a group such as a lower alkylene group, and Y
2
is a group such as a piperazinediyl group. The oxazole compound has a specific inhibitory action against phosphodiesterase 4.