| abstract |
A compound of formula (1), or a pharmaceutically acceptable salt thereof, wherein Ar is a substituted heteroaryl group bearing at least one nitro or azido group or is a group of formula (2) or (3); R1 is hydrogen, optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl; R 2 is alkyl, alkoxy, thialkoxy or halo; R 3 , R 4 and R 5 are each independently alkyl, alkoxy, thialkoxy or halo with the proviso that at least two of R 3 , R 4 or R 5 are alkoxy; L is —OC(O)— or —OP(O)(OR 6 )—; n is 0 or 1; X is O, S or NR 7 ; Y is hydrogen, alkyl, alkoxy, thialkoxy, halo, hydroxy or dihydrogenphosphate; R 6 is hydrogen or alkyl; R 7 is hydrogen or alkyl; R 8 is hydrogen, alkoxy or dialkylaminoalkyl; R 9 is optionally substituted alkyl; R 10 is hydrogen, alkyl, alkoxy or dialkylaminoalkyl; R 11 , and R 12 are independently hydrogen, alkyl, alkoxy, thialkoxy, amono alkylamino, dialkylamino, morpholino, alkylmorpholino, piperidino, alkylpiperidiono, piperazino, alkylpiperazino or 1-aziridinyl; and A, together with the carbon atoms to which it is fused, is an optionally substituted aryl or heteroaryl ring. |