Sulfatase-Cleavable Linkers for Antibody-Drug Conjugates

1 . A conjugate comprising:

an antibody;

a drug; and

a cleavable linker that links the antibody to the drug and comprises a sulfatase-cleavable moiety.

2 .- 16 . (canceled)

17 . A compound of formula (II):

wherein

Z is CR 4 or N;

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; and

W 1 is a drug.

18 . The compound of claim 17 , wherein the compound is of formula (IIa):

19 . The compound of claim 17 , wherein the compound is of formula (IIb):

20 . The compound of claim 17 , wherein the compound is of formula (IIc):

21 . The compound of claim 17 , wherein the compound is of formula (IId):

22 . The compound of claim 17 , wherein the compound is of formula (IIe):

23 . The compound of claim 17 , 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.

24 . The compound of claim 17 , 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.

25 . The compound of claim 23 , 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.

26 . The compound of claim 23 , 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—.

27 . The compound of claim 17 , wherein the drug is an auristatin.

28 . The compound of claim 17 , wherein the drug is a maytansine.

29 .- 31 . (canceled)