Sulfatase-cleavable linkers for antibody-drug conjugates

1. A conjugate of formula (I):

wherein

Z is CR 4 or N;

R 1 is selected from hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl;

R 2 and R 3 are each independently selected from hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, alkoxy, substituted alkoxy, amino, substituted amino, carboxyl, carboxyl ester, acyl, acyloxy, acyl amino, amino acyl, alkylamide, substituted alkylamide, sulfonyl, thioalkoxy, substituted thioalkoxy, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl, or R 2 and R 3 are optionally cyclically linked to form a 5 or 6-membered heterocyclyl;

each R 4 is independently selected from hydrogen, halogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, alkoxy, substituted alkoxy, amino, substituted amino, carboxyl, carboxyl ester, acyl, acyloxy, acyl amino, amino acyl, alkylamide, substituted alkylamide, sulfonyl, thioalkoxy, substituted thioalkoxy, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl;

R 5 is selected from hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl;

L 1 is a first linker;

L 2 is a second linker;

W 1 is a drug; and

W 2 is an antibody.

2. The conjugate of claim 1 , wherein the conjugate is of formula (Ia):

3. The conjugate of claim 1 , wherein the conjugate is of formula (Ib):

4. The conjugate of claim 1 , wherein the conjugate is of formula (Ic):

5. The conjugate of claim 1 , wherein the conjugate is of formula (Id):

6. The conjugate of claim 1 , wherein the conjugate is of formula (Ie):

7. The conjugate of claim 1 , wherein L 1 comprises:

-(T 1 -V 1 ) a -(T 2 -V 2 ) b -(T 3 -V 3 ) c -(T 4 -V 4 ) d -,

wherein

a, b, c and d are each independently 0 or 1;

T 1 , T 2 , T 3 and T 4 are each independently selected from (C 1 -C 12 )alkyl, substituted (C 1 -C 12 )alkyl, (EDA)w, (PEG)n, (AA)p, —(CR 13 OH) m —, piperidin-4-amino (4AP), an acetal group, a hydrazine, a disulfide, and an ester, wherein EDA is an ethylene diamine moiety, PEG is a polyethylene glycol, and AA is an amino acid residue, wherein each w is an integer from 1 to 20, each n is an integer from 1 to 30, each p is an integer from 1 to 20, and each m is an integer from 1 to 12;

V 1 , V 2 , V 3 and V 4 are each independently selected from the group consisting of a covalent bond, —CO—, —NR 15 —, —NR 15 (CH 2 ) q —, —NR 15 (C 6 H 4 )—, —CONR 15 —, —NR 15 CO—, —C(O)O—, —OC(O)—, —O—, —S—, —S(O)—, —SO 2 —, —SO 2 NR 15 —, —NR 15 SO 2 — and —P(O)OH—, wherein each q is an integer from 1 to 6;

each R 13 is independently selected from hydrogen, an alkyl, a substituted alkyl, an aryl, and a substituted aryl; and

each R 15 is independently selected from hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, carboxyl, carboxyl ester, acyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl.

8. The conjugate of claim 1 , wherein L 2 comprises:

-(T 5 -V 5 ) e -(T 6 -V 6 ) f -(T 7 -V 7 ) g -(T 8 -V 8 ) h -,

wherein

e, f, g and h are each independently 0 or 1;

T 5 , T 6 , T 7 and T 8 are each independently selected from (C 1 -C 12 )alkyl, substituted (C 1 -C 12 )alkyl, (EDA) w , (PEG) n , (AA) p , —(CR 13 OH) m —, piperidin-4-amino (4AP), an acetal group, a hydrazine, a disulfide, and an ester, wherein EDA is an ethylene diamine moiety, PEG is a polyethylene glycol, and AA is an amino acid residue, wherein each w is an integer from 1 to 20, each n is an integer from 1 to 30, each p is an integer from 1 to 20, and each m is an integer from 1 to 12;

V 5 , V 6 , V 7 and V 8 are each independently selected from the group consisting of a covalent bond, —CO—, —NR 15 —, —NR 15 (CH 2 ) q —, —NR 15 (C 6 H 4 )—, —CONR 15 —, —NR 15 CO—, —C(O)O—, —OC(O)—, —O—, —S—, —S(O)—, —SO 2 —, —SO 2 NR 15 —, —NR 15 SO 2 — and —P(O)OH—, wherein each q is an integer from 1 to 6;

each R 13 is independently selected from hydrogen, an alkyl, a substituted alkyl, an aryl, and a substituted aryl; and

each R 15 is independently selected from hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, carboxyl, carboxyl ester, acyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclyl, and substituted heterocyclyl.

9. The conjugate of claim 7 , wherein:

T 1 is selected from a (C 1 -C 12 )alkyl and a substituted (C 1 -C 12 )alkyl;

T 2 , T 3 , and T 4 are each independently selected from (EDA) w , (PEG) n , (C 1 -C 12 )alkyl, substituted (C 1 -C 12 )alkyl, (AA) p , —(CR 13 OH) m —, 4-amino-piperidine (4AP), an acetal group, a hydrazine, and an ester; and

V 1 , V 2 , V 3 and V 4 are each independently selected from the group consisting of a covalent bond, —CO—, —NR 15 , —NR 15 (CH 2 ) q —, —NR 15 (C 6 H 4 )—, —CONR 15 —, —NR 15 CO—, —C(O)O—, —OC(O)—, —O—, —S—, —S(O)—, —SO 2 —, —SO 2 NR 15 —, —NR 15 SO 2 —, and —P(O)OH—;

wherein:

(PEG) n is

where n is an integer from 1 to 30;

EDA is an ethylene diamine moiety having the following structure:

where y is an integer from 1 to 6 and r is 0 or 1;

4-amino-piperidine (4AP) is

each R 12 and R 15 is independently selected from hydrogen, an alkyl, a substituted alkyl, a polyethylene glycol moiety, an aryl and a substituted aryl, wherein any two adjacent R 12 groups may be cyclically linked to form a piperazinyl ring; and

R 13 is selected from hydrogen, an alkyl, a substituted alkyl, an aryl, and a substituted aryl.

10. The conjugate of claim 7 , wherein:

T 1 is (C 1 -C 12 )alkyl and V 1 is —CO—;

T 2 is 4AP and V 2 is a covalent bond;

T 3 is (PEG) n and V 3 is —CONR 15 —; and

T 4 is (C 1 -C 12 )alkyl and V 4 is —CO—.

11. The conjugate of claim 1 , wherein the drug is an auristatin.

12. The conjugate of claim 1 , wherein the drug is a maytansine.

13. A pharmaceutical composition comprising:

a conjugate of claim 1 ; and

a pharmaceutically-acceptable excipient.

14. A method comprising:

administering to a subject an effective amount of a conjugate of claim 1 .

15. A method of treating cancer in a subject, the method comprising:

administering to the subject a therapeutically effective amount of a pharmaceutical composition comprising a conjugate of claim 1 , wherein the administering is effective to treat cancer in the subject.