Substituted pyrimidine compounds

1. A method of treating a condition or disease which can be treated by inhibition of PDE4 enzyme in a subject, comprising administering to the subject a compound of formula (I)

wherein

A, B and C independently represent CH or N;

R 1 and R 2 independently represent

hydrogen or (C 1 -C 6 )-alkyl, whereby said (C 1 -C 6 )-alkyl is unsubstituted or substituted with at least one substituent X 1 , or

a group U, which is a 3- to 12-membered mono- or bi-cycloaliphatic ring, which is unsubstituted or substituted with at least one substituent X 2 , whereby said group U may be connected to the nitrogen atom via a C 1-6 -alkylene group, which in turn is unsubstituted or substituted with at least one substituent independently selected from the group consisting of F, Cl, CF 3 , ═O, OCF 3 and OH, or

a group V, which is a 3- to 12-membered mono- or bi-cyclic heterocycloaliphatic ring comprising at least one heteroatom selected from the group consisting of O, S and N as a ring member, and which mono- or bicyclic heterocycloaliphatic ring is unsubstituted or substituted with at least one substituent X 3 , whereby said group V may be connected to the nitrogen atom via a C 1-6 -alkylene group, which in turn may be unsubstituted or substituted with at least one substituent independently selected from the group consisting of F, Cl, CF 3 , ═O, OCF 3 and OH, or

a group W which is phenyl or 5- or 6-membered heteroaryl, wherein said phenyl or said heteroaryl is unsubstituted or substituted with at least one substituent X 4 and may be condensed with a 4-, 5-, 6- or 7-membered ring, being carbocyclic or heterocyclic, wherein said condensed ring may be saturated, partially unsaturated or aromatic and may be substituted with at least on substituent X 5 , and whereby group W may be connected to the nitrogen atom via a C 1-6 -alkylene group, which in turn may be unsubstituted or substituted with at least one substituent independently selected from the group consisting of F, Cl, CF 3 , ═O, OCF 3 and OH, or

R 1 and R 2 together with the nitrogen atom to which they are attached form a 3- to 12-membered monocyclic or bicyclic non-aromatic or aromatic ring wherein said ring may contain at least one additional heteroatom selected from the group consisting of O, S and N and wherein said ring is unsubstituted or substituted with at least one substituent X 6 ;

R 3 and R 4 ,

independently represent hydrogen, (C 1 -C 6 )-alkyl or (C 3 -C 6 )-cycloalkyl, wherein said (C 1 -C 6 )-alkyl and (C 3 -C 6 )-cycloalkyl are each unsubstituted or substituted with at least one substituent Y 1 , or

together with the carbon atom to which they are attached form a 3- to 6-membered cycloalkyl ring, which is unsubstituted or substituted with at least one substituent Y 2 ;

L represents a bond, O, S, (C 1 -C 6 )-alkylene or (C 2 -C 6 )-alkenylene, whereby the aforementioned alkylenes or alkenylenes are in each case unsubstituted or substituted with at least one substituent selected from the group consisting of F, Cl, CF 3 , ═O, OCF 3 and OH;

G represents a phenyl or 5- or 6-membered heteroaryl, wherein said phenyl or said heteroaryl may be substituted with at least one substituent Z;

X 1 , X 2 , X 3 , X 5 and X 6 , at each occurrence are independently from one another selected from the group consisting of OH, ═O, CN, nitro, halogen, (C 1 -C 6 )-alkyl, (C 1 -C 6 )-hydroxyalkyl, (C 1 -C 6 )-alkoxy, S(C 1 -C 6 )-alkyl, S(O)—(C 1 -C 6 )-alkyl, S(O) 2 —(C 1 -C 6 )-alkyl, (C 1 -C 6 )-haloalkyl, S(C 1 -C 6 )-haloalkyl, (C 1 -C 6 )-haloalkoxy, (C 1 -C 6 )-cyanoalkyl, (C 3 -C 8 )-cycloalkyl, NH 2 , NH(C 1 -C 6 )-alkyl, N((C 1 -C 6 )-alkyl) 2 , NH—CO—(C 1 -C 6 )-alkyl, NH—SO—(C 1 -C 6 )-alkyl, NH—S(O) 2 —(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO 2 —(C 1 -C 6 )-alkyl, NHCONH 2 , NH—CO—NH—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—N((C 1 -C 6 )-alkyl) 2 , CO—(C 1 -C 6 )-alkyl, CO 2 H, CO—O—(C 1 -C 6 )-alkyl, CONH 2 , CO—NH(C 1 -C 6 )alkyl and CO—N((C 1 -C 6 )-alkyl) 2 ;

X 4 at each occurrence are independently from one another selected from the group consisting of OH, CN, nitro, halogen, (C 1 -C 6 )-alkyl, (C 1 -C 6 )-hydroxyalkyl, (C 1 -C 6 )-alkoxy, S(C 1 -C 6 )-alkyl, S(O)—(C 1 -C 6 )-alkyl, S(O) 2 —(C 1 -C 6 )-alkyl, (C 1 -C 6 )-haloalkyl, S(C 1 -C 6 )-haloalkyl, (C 1 -C 6 )-haloalkoxy, (C 1 -C 6 )-cyanoalkyl, (C 3 -C 8 )-cycloalkyl, NH 2 , NH(C 1 -C 6 )-alkyl, N((C 1 -C 6 )-alkyl) 2 , NH—CO—(C 1 -C 6 )-alkyl, NH—SO—(C 1 -C 6 )-alkyl, NH—S(O) 2 —(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO 2 —(C 1 -C 6 )-alkyl, NHCONH 2 , NH—CO—NH—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—N((C 1 -C 6 )-alkyl) 2 , CO 2 H, CO—O—(C 1 -C 6 )-alkyl, CONH 2 , CO—NH(C 1 -C 6 )alkyl and CO—N((C 1 -C 6 )-alkyl) 2 ;

Y 1 and Y 2 , at each occurrence are independently from one another selected from the group consisting of OH, ═O, CN, nitro, halogen, (C 1 -C 6 )-alkyl, (C 1 -C 6 )-hydroxyalkyl, (C 1 -C 6 )-alkoxy, S(C 1 -C 6 )-alkyl, S(O)—(C 1 -C 6 )-alkyl, S(O) 2 —(C 1 -C 6 )-alkyl, (C 1 -C 6 )-haloalkyl, S(C 1 -C 6 )-haloalkyl, (C 1 -C 6 )-haloalkoxy, (C 1 -C 6 )-cyanoalkyl, (C 3 -C 8 )-cycloalkyl, NH 2 , NH(C 1 -C 6 )-alkyl, N((C 1 -C 6 )-alkyl) 2 , NH—CO—(C 1 -C 6 )-alkyl, NH—SO—(C 1 -C 6 )-alkyl, NH—S(O) 2 —(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-SO 2 —(C 1 -C 6 )-alkyl, NHCONH 2 , NH—CO—NH—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—N((C 1 -C 6 )-alkyl) 2 , CO 2 H, CO—O—(C 1 -C 6 )-alkyl, CONH 2 , CO—NH(C 1 -C 6 )alkyl and CO—N((C 1 -C 6 )-alkyl) 2 ;

Z at each occurrence is independently selected from the group consisting of halogen, OH, CN, SH, nitro, (C 1 -C 6 )-alkyl, (C 2 -C 6 )-alkenyl, (C 2 -C 6 )-alkinyl, (C 1 -C 6 )-hydroxyalkyl, (C 1 -C 6 )-cyanoalkyl, (C 1 -C 6 )-alkoxy, (C 1 -C 6 )-thioalkyl, (C 1 -C 6 )-haloalkyl, (C 1 -C 6 )-thiohaloalkyl, (C 1 -C 6 )-haloalkoxy, (C 1 -C 6 )-alkylen-S—(C 1 -C 6 )-alkyl, (C 3 -C 8 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 3 )-alkylenyl, (C 3 -C 8 )-heterocycloalkyl, NH 2 , NH(C 1 -C 6 )-alkyl, N((C 1 -C 6 )-alkyl) 2 , NH—CO—(C 1 -C 6 )-alkyl, NH—CO—O—(C 1 -C 6 )-alkyl, NH—C(O)NH 2 , NH—CO—NH—(C 1 -C 6 )-alkyl, NH—CO—N((C 1 -C 6 )-alkyl) 2 , NH((C 1 -C 6 )-alkylen)-CO—O—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CONH 2 , NH((C 1 -C 6 )-alkylen)-CO—NH—(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-CO—N((C 1 -C 6 )-alkyl) 2 , NH—S(O) 2 OH, NH—S(O) 2 (C 1 -C 6 )-alkyl, NH—S(O) 2 O(C 1 -C 6 )-alkyl, NH—S(O) 2 NH 2 , NH—S(O) 2 NH(C 1 -C 6 )-alkyl, NH—S(O) 2 N((C 1 -C 6 )-alkyl) 2 , NH((C 1 -C 6 )-alkylen)-S(O) 2 OH, NH((C 1 -C 6 )-alkylen)-S(O) 2 (C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-S(O) 2 O(C 1 -C 6 )-alkyl, NH((C 1 -C 6 )-alkylen)-S(O) 2 NH 2 , NH((C 1 -C 6 )-alkylen)-S(O) 2 NH(C 1 -C 6 )-alkyl, CO 2 H, CO(C 1 -C 6 )-alkyl, CO—O(C 1 -C 6 )-alkyl, O—CO(C 1 -C 6 )-alkyl, O—CO—O(C 1 -C 6 )-alkyl, CONH 2 , CO—NH(C 1 -C 6 )-alkyl, CO—N((C 1 -C 6 )-alkyl) 2 , O—CO—NH(C 1 -C 6 )-alkyl, O—CO—N((C 1 -C 6 )-alkyl) 2 , O—S(O) 2 —(C 1 -C 6 )-alkyl, O—S(O) 2 OH, O—S(O) 2 —(C 1 -C 6 )-alkoxy, O—S(O) 2 NH 2 , O—S(O) 2 —NH(C 1 -C 6 )-alkyl, O—S(O) 2 —N((C 1 -C 6 )-alkyl) 2 , S(O)(C 1 -C 6 )-alkyl, S(O) 2 (C 1 -C 6 )-alkyl, S(O) 2 OH, S(O) 2 O(C 1 -C 6 )-alkyl, S(O) 2 NH 2 , S(O) 2 NH(C 1 -C 6 )-alkyl, and S(O) 2 N((C 1 -C 6 )-alkyl) 2 ;

wherein the compound of formula (I) is in its presented form or its acid or base form, or in the form of a physiologically acceptable salt, or in its solvate form, or in the form of its racemates, its pure stereoisomers, enantiomers or diastereomers, or in the form of mixtures of stereoisomers, enantiomers or diastereomers, in any mixing ratio,

wherein the condition or disease is

psoriatic arthritis; or

psoriasis; or

chronic obstructive pulmonary disease (COPD).

2. The method of claim 1 , wherein the condition or disease is psoriatic arthritis.

3. The method of claim 1 , wherein the condition or disease is psoriasis.

4. The method of claim 1 , wherein the condition or disease is chronic obstructive pulmonary disease (COPD).