Coumarin dyes and conjugates thereof

1. A compound having fbrmula (I):

wherein

R 1 is L-RG;

R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from H, halogen, alkenyl, alkynyl, cyano, trifluoromethyl, aryloxy, azido, amino, hydroxy, WSG, L-WSG, substituted or unsubstituted alkyl and substituted or unsubstituted alkoxy, wherein the substituted alkyl and substituted alkoxy are substituted with a substituent selected from the group consisting of: hydroxy, trifluoromethyl, halogen, alkoxy, aminoalkyl, aminoalkoxy, amino, monoalkylamino, dialkylamino, alkylcarbonylamino, alkoxycarbonylamino, alkoxycarbonyl, carboxy, hydroxyalkoxy, alkoxyalkoxy, monoalkylaminoalkoxy, (carboxyalkyl)amino, alkoxycarbonyl, alkynylcarbonyl, alkylsulfonyl, alkenylsulfonyl, alkynylsulfonyl, arylsulfonyl, alkylsulfonamido, arylsulfonamido, carboxyalkoxy, carboxyalkyl, carboxyalkylamino, cyano, trifluoromethoxy, guanidine, alkyl azide, azide, alkylthio, disulfide, acrylo, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkylalkyl, cycloalkenylalkyl, cycloheteroalkylalkyl, cycloheteroalkenylalkyl and WSG;

R 2 together with R 3 may form a substituted or unsubstituted 6-membered N-heterocycle;

RG is a chemically reactive group selected from carboxylic acid, —COW or —(CO)W, wherein W is selected from succiminidyloxy, sulfosuccinimidyloxy, 1-oxbenzotriazolyl, a substituted or unsubstituted aryloxy group, wherein the one or more substituents are independently selected from nitro, fluoro, chloro, cyano, and trifluoromethyl, carbodiimide, sulfonyl halide, acyl halide, silyl halide, acyl azide, acyl nitrile, acrylamide, amine, formyl, alkyl halide, aryl halide, alkyl sulfonate, sulfonate ester, anhydride, azide, aziridine, diazoalkane, haloacetamide, halotriazine, hydrazine, hydroxylamine, isocyanate, isothiocyanate, maleimide, phosphoramidate, thiol, hydroxy, hydrazine and alkynyl;

L is a linker of formula (VI):

[(CH 2 ) a —Y—(CH 2 ) b ] c   (VI)

wherein

Y is independently selected from a bond, O, S, NH, NR 9 , SO 2 —NH, SO 2 —NR 9 , CO—NH, CO—O, C═N—NHR 9 , CO—S, 1,2,3-triazolyl, CO—O—CO, aminotriazinyl, triazinyl ether, NH—CO—NH, NH—CS—NH, NH—CO—O, POR 9 —O, SO 2 , SO 2 —O, amino acid, aryl or heteroaryl,

wherein R 9 is alkyl or WSG,

a and c are each independently 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,

b is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; and

WSG is a water soluble group selected from sulfonic acid, sulfate, alkyl sulfonic acid, thiosulfonic acid, sulfonamide, phosphate, phosphonic acid, boronic acid, ammonium, pyridinium, quinolium, acridinium, cyclodextrin, monosaccharide, oligosaccharide, dextrane and —(CH 2 —CH 2 —O) x , in which x is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10;

with the proviso that at least one of R 7 and R 8 is WSG,

and salts thereof.

2. The compound according to claim 1 having formula (II):

wherein

R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from H, halogen, cyano, trifluoromethyl, hydroxy, WSG, L-WSG, substituted or unsubstituted alkyl, and substituted or unsubstituted alkoxy;

with the proviso that at least one of R 7 and R 8 is a sulfonic acid;

and salts thereof.

3. The compound according to claim 1 having formula (III):

wherein

R 2 is selected from substituted or unsubstituted alkyl, and L-WSG;

R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from H, halogen, hydroxy, cyano, substituted or unsubstituted alkyl, and substituted or unsubstituted alkoxy;

and

n is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10;

with the proviso that at least one of R 7 and R 8 is a sulfonic acid;

and salts thereof.

4. The compound according to claim 1 having formula (IV):

wherein

R 2 is selected from substituted or unsubstituted alkyl, and L-WSG;

and R 3 , R 4 , R 5 , and R 6 are independently H;

and salts thereof.

5. The compound according to claim 1 , wherein Y is selected from a bond, O, S, SO 2 —NH, SO 2 —NR 9 , CO—NH, CO—O, CO—S, 1,2,3-triazolyl, NH—CO—NH, NH—CS—NH, NH—CO—O, SO 2 —O, aryl, heteroaryl and amino acid.

6. The compound according to claim 5 , wherein Y is selected from a bond, O, S, SO 2 —NH, SO 2 —NR 9 , CO—NH, CO—O and 1,2,3-triazolyl.

7. The compound according to claim 1 , wherein WSG is selected from sulfonic acid, alkyl sulfonic acid, sulfonamide, phosphate, phosphonic acid, ammonium, pyridinium, cyclodextrin, monosaccharide, oligosaccharide, dextrane and —(CH 2 —CH 2 —O) x in which x is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

8. The compound according to claim 7 , wherein WSG is selected from sulfonic acid, alkyl sulfonic acid, sulfonamide, ammonium and —(CH 2 —CH 2 —O) x in which x is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

9. The compound according to claim 1 , wherein RG is selected from carboxylic acid, —COW or —(CO)W, wherein W is selected from succiminidyloxy, sulfosuccinimidyloxy, 1-oxybezotriazolyl, a substituted or unsubstituted aryloxy group, wherein the one or more substituents are independently selected from nitro, fluoro, chloro, cyano, and trifluoromethyl, sulfonyl halide, acyl halide, amine, alkyl halide, aryl halide, anhydride, azide, haloacetamide, halotriazine, hydrazine, isocyanate, isothiocyanate, maleimide, phosphoramidate, thiol, hydroxy and alkynyl.

10. The compound according to claim 9 , wherein RG is selected from carboxylic acid, —COW or —(CO)W, wherein W is selected from succiminidyloxy, sulfosuccinimidyloxy, 1-oxybenzotriazolyl, a substituted or unsubstituted aryloxy group, wherein the one or more substituents are independently selected from nitro, fluoro, chloro, cyano, and trifluoromethyl, amine, azide, haloacetamide, hydrazine, isocyanate, maleimide and alkynyl.

11. The compound according to claim 1 , selected from:

sodium 5-(7-((5-carboxypentyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonate;

sodium 5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonate;

sodium 5-(7-(ethyl(6-hydrazinyl-6-oxohexyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonate;

sodium 5-(7-((6-((2-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)ethyl)amino)-6-oxohexyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonate;

sodium 5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(3-sulfonatopropyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonate;

sodium 5-(9-(6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)-2-oxo-6,7,8,9-tetrahydro-2H-pyrano[3,2-g]quinolin-3-yl)thiophene-2,4-disulfonate;

5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(2-(2-methoxyethoxy)ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonic acid;

5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(2-oxo-2-((3-sulfopropyl)amino)ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonic acid;

5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(3-(N-(2-sulfoethyl)sulfamoyl)propyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonic acid;

5-(7-((3-(N-(6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)sulfamoyl)propyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonic acid;

5-(7-((4-(((2,5-dioxopyrrolidin-1-yl)oxy)carbonyl) benzyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonic acid;

2,2′-((5-(7-((6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)(ethyl)amino)-2-oxo-2H-chromen-3-yl)thiophene-2,4-disulfonyl)bis(azanediyl))bis(ethane-1-sulfonic acid); and

2,5-dioxopyrrolidin-1-yl 6-((3-(3,5-disulfamoylthiophen-2-yl)-2-oxo-2H-chromen-7-yl)(ethyl)amino)hexanoate.

12. A kit comprising at least one compound according to claim 1 .

13. A compound having formula (V):

wherein

R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from H, halogen, alkenyl, alkynyl, cyano, trifluoromethyl, aryloxy, azido, amino, hydroxy, WSG, L-WSG, substituted or unsubstituted alkyl and substituted or unsubstituted alkoxy, wherein the substituted alkyl and substituted alkoxy are substituted with a substituent selected from the group consisting of: hydroxy, trifluoromethyl, halogen, alkoxy, aminoalkyl, aminoalkoxy, amino, monoalkylamino, dialkylamino, alkylcarbonylamino, alkoxycarbonylamino, alkoxycarbonyl, carboxy, hydroxyalkoxy, alkoxyalkoxy, monoalkylaminoalkoxy, (carboxyalkyl)amino, alkoxycarbonyl, alkynylcarbonyl, alkylsulfonyl, alkenylsulfonyl, alkynylsulfonyl, arylsulfonyl, alkylsulfonamido, arylsulfonamido, carboxyalkoxy, carboxyalkyl, carboxyalkylamino, cyano, trifluoromethoxy, guanidine, alkyl azide, azide, alkylthio, disulfide, acrylo, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkylalkyl, cycloalkenylalkyl, cycloheteroalkylalkyl, cycloheteroalkenylalkyl and WSG;

R 2 together with R 3 may form a substituted or unsubstituted 6-membered N-heterocycle;

L is a linker of formula (VI):

[(CH 2 ) 3 —Y—(CH 2 ) b ] c   (VI)

wherein Y is independently selected from a bond, O, S, NH, NR 9 , SO 2 —NH, SO 2 —NR 9 , CO—NH, CO—O, C═N—NHR 9 , CO—S, 1,2,3-triazolyl, CO—O—CO, aminotriazinyl, triazinyl ether, NH—CO—NH, NH—CS—NH, NH—CO—O, O—POR 9 —O, SO 2 , SO 2 —O, amino acid, aryl and heteroaryl,

wherein R 9 is alkyl or WSG,

a and c are each independently 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,

b is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10;

WSG is a water soluble group and is selected from sulfonic acid, sulfate, alkyl sulfonic acid, thiosulfonic acid, sulfonamide, phosphate, phosphonic acid, boronic acid, ammonium, pyridinium, quinolium, acridinium, cyclodextrin, monosaccharide, oligosaccharide, dextrane and —(CH 2 —CH 2 —O) x in which x is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10;

m is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25; and

SUB is an amino acid, a peptide, a protein, a saccharide, a nucleoside, a nucleotide, an oligonucleotide, a nucleic acid, a hapten, a drug or a lipid;

with the proviso that and at least one of R 7 and R 8 is a sulfonic acid,

and salts thereof.

14. The compound according to claim 13 , wherein R 2 is substituted or unsubstituted alkyl or L-WSG.

15. The compound according to claim 13 , wherein R 3 , R 4 , R 5 and R 6 are independently H.

16. The compound according to claim 13 , wherein R 7 and R 8 are independently sulfonic acid and are bound to positions 2 and 4 of the thienyl ring.

17. A kit comprising at least one compound according to claim 13 .