Modulators of toll-like receptors

A compound having the structure:

• or a pharmaceutically acceptable salt thereof, wherein:
• L1 is —NH— or —O—;
• R1 is C1-C6 alkyl, C1-C6 heteroalkyl, C3-C20 heterocyclylalkyl, or C4-C20 carbocyclylalkyl, wherein the heteroalkyl group containing one or more heteroatoms selected from O, N and S, and wherein the heterocyclyl group containing 1 to 4 heteroatoms selected from N, O and S;
• each of R4 and R5 independently is H or C1-C6 alkyl;
• X1 is C1-C6 alkylene, or C1-C6 heteroalkylene;
• D is phenyl, biphenyl or pyridinyl, wherein said phenyl, biphenyl or pyridinyl is substituted with -L2-NR6R7;
• or
• D is pyridinyl, piperidinyl, piperazinyl or 1,2,3,4-tetrahydroisoquinolinyl;
• n is 0 or 1;
• R3 is selected from the group consisting of cyano, C1-C6 alkyl, C1-C6 haloalkyl, —CHO, or C4-C20 carbocyclylalkyl;
• and
• L2 is C1-C6 alkylene or a covalent bond;
• each of R6 and R7 independently is H, or C1-C6 alkyl;
• or
• R6 and R7 taken together with the nitrogen to which they are attached form an unsubstituted 4-6 membered heterocycle containing 0 to 2 additional heteroatoms selected from N, O and S.