Intermediates for imidazonaphthyridines

1. A compound of formula

wherein

R 1 is selected from the group consisting of:

—C 1-20 alkyl or C 2-20 alkenyl that is unsubstituted or substituted by one or more substituents selected from the group consisting of:

-aryl;

-heteroaryl;

-heterocyclyl;

—O—C 1-20 alkyl;

—O—(C 1-20 alkyl) 0-1 -aryl;

—O—(C 1-20 alkyl) 0-1 -heteroaryl;

—O—(C 1-20 alkyl) 0-1 -heterocyclyl;

—C 1-20 alkoxycarbonyl;

—S(O) 0-2 —C 1-20 alkyl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -aryl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -heteroaryl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -heterocyclyl;

—N(R 3 ) 2 ;

—N 3 ;

oxo;

-halogen;

—NO 2 ;

—OH; and

—SH; and

—C 1-20 alkyl-NR 3 -Q-X—R 4 or —C 2-20 alkenyl-NR 3 -Q-X—R 4 wherein Q is —CO— or —SO 2 —; X is a bond, —O— or —NR 3 —; and R 4 is aryl; heteroaryl; heterocyclyl; or —C 1-20 alkyl or C 2-20 alkenyl that is unsubstituted or substituted by one or more substituents selected from the group consisting of:

-aryl;

-heteroaryl;

-heterocyclyl;

—O—C 1-20 alkyl;

—O—(C 1-20 alkyl) 0-1 -aryl;

—O—(C 1-20 alkyl) 0-1 -heteroaryl;

—O—(C 1-20 alkyl) 0-1 -heterocyclyl;

—C 1-20 alkoxycarbonyl;

—S(O) 0-2 —C 1-20 alkyl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -aryl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -heteroaryl;

—S(O) 0-2 —(C 1-20 alkyl) 0-1 -heterocyclyl;

—N(R 3 ) 2 ;

—NR 3 —CO—O—C 1-20 alkyl;

—N 3 ;

oxo;

-halogen;

—NO 2 ;

—OH; and

—SH; or R 4 is

wherein Y is —N— or —CR—;

each R 3 is independently selected from the group consisting of hydrogen and C 1-10 alkyl;

each R is selected from the group consisting of hydrogen, C 1-10 alkyl, C 1-10 alkoxy, halogen and trifluoromethyl; and

R 10 is —NO 2 or NH 2 ;

or a pharmaceutically acceptable salt thereof.