3-O-heteroaryl-ingenol

1. A compound according to the general formula I

wherein R 1 represents heteroaryl, and wherein R 1 is optionally substituted with one or more substituents independently selected from R 2 ;

wherein R 2 represents cyano or halogen;

or R 2 represents (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl, (C 1 -C 6 )alkoxy, (C 3 -C 6 )cycloalkyl, halo(C 1 -C 6 )alkyloxy, heterocycloalkyl, aryl or heteroaryl; said (C 1 -C 6 )alkyl optionally being substituted with one or more substituents independently selected from the group consisting of halogen, cyano, hydroxyl and oxo;

or R 2 represents —NR a COR b , —CONR a R b , —COOR a , —COOR a , —OR a , —COONR a R b , —NR a COOR b , —NR a SO 2 R b , —SO 2 NR a R b , —SO 2 R a , —S(O)R a or —NR a R b ;

wherein R a and R b are each independently selected from the group consisting of hydrogen, (C 1 -C 4 )alkyl, halo(C 1 -C 4 )alkyl, hydroxy(C 1 -C 4 )alkyl, cyano(C 1 -C 4 )alkyl, aryl, heteroaryl, (C 3 -C 6 )cycloalkyl and heterocycloalkyl;

or two adjacent R 2 's join together to form a 5-7 membered non-aromatic carbocyclic or heterocyclic ring together with the carbon or nitrogen atoms to which they are attached;

and pharmaceutically acceptable salts, hydrates, solvates or pharmaceutically acceptable and physiologically cleavable esters thereof.

2. The compound according to claim 1 wherein R 1 represents heteroaryl; said heteroaryl optionally being substituted with one or more substituents independently selected from R 2 ; and wherein said heteroaryl is selected from the group consisting of

wherein X 1 , X 2 , X 3 and X 4 are each independently selected from the group consisting of C, CH, N, NH, S and O; and wherein Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , Y 6 , Y 7 , Y 8 , Y 9 and Y 10 are each independently selected from the group consisting of C, CH and N.

3. The compound according to claim 2 , wherein

R 1 represents G 1 and wherein at least one of X 1 or X 4 is selected from the group consisting of N, NH, S and O; or

R 1 represents G 2 and wherein at least one of Y 1 or Y 5 represents N; or

R 1 represents G 3 and wherein the point of attachment to formula I occurs through X 1 or X 3 and wherein X 2 is selected from the group consisting of N, NH, S and O; or

R 1 represents G 3 and wherein the point of attachment to formula I occurs through X 2 and wherein at least one of X 1 and X 3 is selected from the group consisting of N, NH, S and O; or

R 1 represents G 4 and wherein the point of attachment to formula I occurs through Y 1 and wherein Y 2 represents N; or

R 1 represents G 4 and wherein the point of attachment to formula I occurs through Y 2 and wherein at least one of Y 1 and Y 3 represents N; or

R 1 represents G 5 and wherein the point of attachment to formula I occurs through Y 1 and wherein Y 2 represents N; or

R 1 represents G 5 and wherein the point of attachment to formula I occurs through Y 2 and wherein at least one of Y 1 and Y 3 represents N.

4. The compound according to claim 2 , wherein

R 1 represents G 1 and wherein one X 1 or X 4 is selected from the group consisting of N, NH, S and O and wherein the other X 1 or X 4 is substituted with R 2 ; or

R 1 represents G 2 and wherein one Y 1 or Y 5 represents N, and wherein the other Y 1 or Y 5 is substituted with R 2 ; or

R 1 represents G 3 and wherein the point of attachment to formula I occurs through X 1 or X 3 and wherein X 2 is selected from the group consisting of N, NH, S and O; or

R 1 represents G 4 and wherein the point of attachment to formula I occurs through Y 1 and wherein Y 2 represents N; or

R 1 represents G 5 and wherein the point of attachment to formula I occurs through Y 1 and wherein Y 2 represents N.

5. The compound according to claim 1 wherein R 1 represents oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, imidazolyl, pyrazolyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, isoquinolinyl, benzoxazolyl, indazolyl, thienopyridyl, furopyridyl or oxadiazolyl.

6. The compound according to claim 1 wherein R 2 represents halogen, cyano, (C 1 -C 4 )alkyl, halo(C 1 -C 4 )alkyl, (C 2 -C 6 )alkenyl, (C 1 -C 6 )alkoxy or (C 3 -C 6 )cycloalkyl.

7. The compound according to claim 1 wherein R 2 represents methyl, trifluoromethyl, trifluoroethyl, propenyl, bromo, chloro, fluoro, cyano, methoxy, isopropyl, cyclopentyl, difluoroethyl or fluoroethyl.

8. The compound according to claim 1 selected from the group consisting of:

3-O-(6-Chloro-5-methyl-pyrimidin-4-yl)-ingenol,

3-O-(1,2-Benzoxazol-3-yl)-ingenol,

3-O-(5-(Trifluoromethyl)-2-pyridyl)-ingenol,

3-O-(5-Allyl-6-chloro-pyrimidin-4-yl)-ingenol,

3-O-(3-Formyl-2-pyridyl)-ingenol,

3-O-(2-Pyridyl)-ingenol,

3-O-(1-Methylindazol-3-yl)-ingenol,

3-O-(1-Methylimidazol-2-yl)-ingenol,

3-O-(1-Allylimidazol-2-yl)-ingenol,

3-O-(5-(Trifluoromethyl)-pyrimidin-2-yl)-ingenol,

3-O-(4-Bromo-2-pyridyl)-ingenol,

3-O-(3-Fluoro-2-pyridyl)-ingenol,

3-O-(4-(Trifluoromethyl)-2-pyridyl)-ingenol,

3-O-(4-(Trifluoromethyl)-pyrimidin-2-yl)-ingenol,

3-O-(3-Chloro-2-pyridyl)-ingenol,

3-O-(3-Cyano-2-pyridyl)-ingenol,

3-O-(6-(Trifluoromethyl)-2-pyridyl)-ingenol,

3-O-(3-(Trifluoromethyl)-2-pyridyl)-ingenol,

3-O-(1-Isoquinolyl)-ingenol,

3-O-(1-Cyclopentylimidazol-2-yl)-ingenol,

3-O-(1-(2,2-Difluoroethyl)imidazol-2-yl)-ingenol,

3-O-(1-(2-Fluoroethyl)imidazol-2-yl)-ingenol,

3-O-(Thieno[2,3-c]pyridine-7-yl)-ingenol,

3-O-(3-Methyl-2-pyridyl)-ingenol,

3-O-(6-Chloro-1,2-benzoxazol-3-yl)-ingenol,

3-O-(Furo[3,2-c]pyridine-4-yl)-ingenol,

3-O-(Thieno[3,2-c]pyridine-4-yl)-ingenol,

3-O-(4-Fluoro-1,2-benzoxazol-3-yl)-ingenol,

3-O-(3-Methoxy-pyridin-2-yl)-ingenol,

3-O-(5-Methoxy-1,2-benzoxazol-3-yl)-ingenol,

3-O-(5-Chloro-1,2-benzoxazol-3-yl)-ingenol,

3-O-(6-Methoxy-1,2-benzoxazol-3-yl)-ingenol, and

3-O-(5-Isopropyl-1,2,4-oxadiazol-3-yl)-ingenol,

and pharmaceutically acceptable salts, hydrates, and solvates or pharmaceutically acceptable and physiologically cleavable esters thereof.

9. A method of ameliorating a disorder or disease which comprises administering to a subject in need thereof a compound according to claim 1 , optionally together with a pharmaceutically acceptable carrier or one or more excipients, wherein the disorder or disease is selected from cutaneous warts, genital warts, actinic keratosis, squamous cell carcinoma (SCC), basal cell carcinoma (BCC), lentigo maligna, cervical intraepithelial neoplasia, anal intraepithelial neoplasia or vulva intraepithelial neoplasia.

10. The method according to claim 9 wherein the disorder or disease is actinic keratosis.

11. A method for ameliorating cosmetic indications which comprises administering to a subject in need thereof a compound according to claim 1 , optionally together with a pharmaceutically acceptable carrier or one or more excipients.

12. The method according to claim 11 wherein the cosmetic indication is selected from photodamaged skin or seborrheic keratosis.

13. A pharmaceutical composition comprising a compound according to claim 1 or a pharmaceutically acceptable stereoisomer, salt or in vivo hydrolysable ester thereof together with a pharmaceutically acceptable vehicle or excipient.

14. The pharmaceutical composition according to claim 13 , wherein the composition is suitable for topical administration.

15. A pharmaceutical composition comprising a compound according to claim 1 or a pharmaceutically acceptable stereoisomer, salt or in vivo hydrolysable ester thereof in combination with one or more other therapeutically active agents.

16. A compound selected from the group consisting of:

3-O-(6-Chloro-5-methyl-pyrimidin-4-yl)-ingenol-5,20-acetonide,

3-O-(1,2-Benzoxazol-3-yl)-ingenol-5,20-acetonide,

3-O-(5-(Trifluoromethyl)-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(5-Allyl-6-chloro-pyrimidin-4-yl)-ingenol-5,20-acetonide,

3-O-(3-Formyl-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(2-Pyridyl)-ingenol-5,20-acetonide,

3-O-(1-Methylindazol-3-yl)-ingenol-5,20-acetonide,

3-O-(1-Methylimidazol-2-yl)-ingenol-5,20-acetonide,

3-O-(1-Allylimidazol-2-yl)-ingenol-5,20-acetonide,

3-O-(5-(Trifluoromethyl)-pyrimidin-2-yl)-ingenol-5,20-acetonide,

3-O-(4-Bromo-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(3-Fluoro-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(4-(Trifluoromethyl)-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(4-(Trifluoromethyl)-pyrimidin-2-yl)-ingenol-5,20-acetonide,

3-O-(3-Chloro-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(3-Cyano-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(6-(Trifluoromethyl)-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(3-(Trifluoromethyl)-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(1-Isoquinolyl)-ingenol-5,20-acetonide,

3-O-(1-Cyclopentylimidazol-2-yl)-ingenol-5,20-acetonide,

3-O-(1-(2,2-Difluoroethyl)imidazol-2-yl)-ingenol-5,20-acetonide,

3-O-(1-(2-Fluoroethyl)imidazol-2-yl)-ingenol-5,20-acetonide,

3-O-(Thieno[2,3-c]pyridine-7-yl)-ingenol-5,20-acetonide,

3-O-(3-Methyl-2-pyridyl)-ingenol-5,20-acetonide,

3-O-(6-Chloro-1,2-benzoxazol-3-yl)-ingenol-5,20-acetonide,

3-O-(Furo[3,2-c]pyridine-4-yl)-ingenol-5,20-acetonide,

3-O-(Thieno[3,2-c]pyridine-4-yl)-ingenol-5,20-acetonide,

3-O-(4-Fluoro-1,2-benzoxazol-3-yl)-ingenol-5,20-acetonide,

3-O-(3-Methoxy-pyridin-2-yl)-ingenol-5,20-acetonide,

3-O-(5-Methoxy-1,2-benzoxazol-3-yl)-ingenol-5,20-acetonide,

3-O-(5-Chloro-1,2-benzoxazol-3-yl)-ingenol-5,20-acetonide,

3-O-(6-Methoxy-1,2-benzoxazol-3-yl)-ingenol-5,20-acetonide, and

3-O-(5-Isopropyl-1,2,4-oxadiazol-3-yl)-ingenol-5,20-acetonide.

17. The compound 3-O-(1,2-benzoxazol-3-yl)-ingenol.

18. The compound 3-O-(5-methoxy-1,2-benzoxazol-3-yl)-ingenol.

19. The compound 3-O-(5-chloro-1,2-benzoxazol-3-yl)-ingenol.