Cleavable drug conjugates, compositions thereof and methods of use

1. A compound of Formula (II):

or a salt thereof, wherein:

each A 1 is independently a moiety selected from Formula (A 1 a1), Formula (A 1 a2), Formula (A 1 a3 ), formula (A 1 b1), Formula (A 1 b 2), Formula (A 1 c1 ), Formula (A 1 c2 ), Formula (A 1 c3). Formula (A 1 d1), Formula (A 1 d2), Formula (A 1 d3), Formula (A 1 e1). Formula A 1 f1 and Formula (A 1 f2):

wherein:

each R 8 and R 9 is independently selected from hydrogen, methyl, ethyl, n-propyl, isopropyl, phenyl, and benzyl;

each E is selected from F, Cl, Br, and I; and

each L 2 is selected from halogen, N-hydroxysuccinimidyl, substituted N -hydroxvsuccinimidyl, phenol-yl, substituted phenol-yl, hydroxybenzotriazolyl, substituted hydroxybenzotriazolyl, imidazolyl, and substituted imidazolyl;

each X 1 and X 3 is independently selected from a covalent bond, C 1-20 alkanediyl, substituted C 1-20 alkanediyl, C 1-20 heteroalkanediyl, substituted C 1-20 heteroalkanediyl, C 3-12 cycloalkanediyl, substituted C 3-12 cycloalkanediyl, C 3-12 heterocycloalkanediyl, substituted C hd 3-12 heterocycloalkanediyl, C 4-20 alkanecycloalkanediyl, substituted C 4-20 alkanecycloalkanediyl, C 4-20 heteroalkanecycloalkanediyl, substituted C 4-20 heteroalkanecycloalkanediyl, C 6-20 arenediyl, substituted C 6-20 arenediyl, C 6-20 heteroarenediyl, substituted C 6-20 heteroarenediyl, C 7-20 alkanearenediyl, substituted C 7-20 alkanearenediyl, C 6-20 heteroalkanearenediyl, substituted C 6-20 heteroalkanearenediyl, and —(CH 2 ) n1 —(CH 2 -CH 2 -O) n2 —(CH 2 ) n3 —, wherein:

each n1 and n3 is independently an integer selected from 0 to 5; and

each n2 is independently an integer selected from 1 to 25;

each X 2 is independently selected from a covalent bond, —O—,—S—,NH—,N═, —N═N—, N═CH—, —SO—, —SO 2 —, SO 2 NH—,—SS—,—C(O)—, —C(O)O—, —C(O)NH—,—C(O)S—, —C(O)NH—N═,—OP(O)(OH)O—,—OC(O)O—, —OC(O)NH—,—NHC(O)NH—, and—NHC(S)NH—;

each R 1 and R 2 is independently selected from hydrogen, C 1-6 alkyl, substituted C 1-6 alkyl, C 1-6 , heteroalkyl, substituted C 1-6 heteroalkyl, C 6-10 aryl, substituted C 6-10 aryl, C 6-10 heteroaryl, and substituted C 6-10 heteroaryl;

D is selected from aminopterin, folitixorin. methotrexate, pemetrexed, ralatrexate, raltitrexed, pelitrexol, talotrexin. deoxycoformycin, cladribine, clofarabine, fludarabine, thioguanine, mercaptopurine, berubicin daunorubicin, doxorubicin, epirubicin, idarubicin, amrubicin, pirarubicin, zorubicin mitoxantrone, banoxantrone, ledoxantrone, nortoixantrone, pixantrone, piroxantrone, sabarubicin, topixantrone, monomethyl, auristatin E, monomethyl, auristatin F, monomethyl, dolastatin, 10, dolastatin 15, belotecan, atiratecan, camptopthecin, exatecan, irinotecan, namitecan, rubitecan, topotecan, demecolcine, duocarmycin A, duocarmycin SA, duocarmycin B, duocarmycin B1 ,abbeymycin, anthramycin, centanamycin, chicamycin, mazethramycin, porothrarnycin A, porothramycin B, sibanomycin, sibiromycm, trabectedin, calicheamicin γ1, calicheamicin T, esperamicin Al, esperamicin C, esperamicin D, dynemicin A, dynemicin H, dynemicin M, dynemicin N, dynemicin O, dynemicin p, dynemicin Q, dynemicin S, neocarzinostatin chromophore, uncialamycin, 21-aminoepothilone B, eribulin, hemiasterlin, HTI-286, kahalatide F, elsamitrucin, lucanthone, melphalan, mitoguazone, nimustine, procarbazine, dacarbazine, amsacrine 5-amino-4-oxo-pentanoic acid. methyl 5-amino-4-oxo -pentanoate, actimomycin D, 7-aminoactinomycin D, bleomycin, mitomycin, staurosporine, desacetylvinblastine hydrazide, vinblastine, vincristine, vindesine, vinflunine, vinorelbine, afatinib, apilimbd, balamanimod, barasertib, bosutinib, ceanertinib, cevipabulin, crizotinib, dacomitinib, dasatinib, denibulin. dilmapimod, dinaciclib, dovitiriib, dutacatib, duvoglustat, edotecarin, elisidepsin, entinostat, epetirimod, erlotinib, fingolimod, fostamatinib, gefitinib, golotimod, gusperimus, imatinib, imiquimod, intedanib, ispinesib, lapatinib, lenalidomide, linifanib, litronesib, losmapimod, metesind, mocetinostat, motesanib, masitinib, myriocin, neratinib, nilotinib, odanacatib, ombrabulin, pamapimod, panobinostat, pazopanib, plerixafor, pomalidomide, razupenem, resiquimod, sabarubicin, saracatinib, seliciclib, selumetinib, sotirimod, squalamine, tacedinaline, talabostat, taltobulin, telatinib, tipifarnib, tozasertib, vandetanib, vatalanib, veliparib, voreloxin, alvespimycin, amikacin, amphotericin B, arbekacin, astromicin, bacitracin, balofloxacin, bederocin, bekanamycin, besifloxacin, brodimoprim, ciprofloxacin, clinafloxacin, colistin, daptomycin, dibekacin, enoxacin, framycetin, garenoxacin, gatifloxacin, gemifloxacin, gentamicin, gentamicin, grepafloxacin, hamycin, hexetidine, hygromycin B, ibacitabine, iclaprim, isepamicin, kanamycin, lomefloxacin, lucimycin, lymecycline, mepartricin, moxifloxacin, natamycin, nemonoxacin, neomycin B, neomycin C, netilmicin, norfloxacin, nystatin, omadacycline, oritavancin, paromomycin, pazufloxacin, perimycin A, perimycin B, perimycin C, pipemidic acid, polymyxin B, puromycin, radezolid, retaspimycin, ribostamycin, rimocidin, sisomicin, sitafloxacin, sparfloxacin, spectinomycin, streptomycin, sulfacetamide, sulfadiazine, sulfadimethoxine, sulfadimidine, sulfafurazole, sulfalene, sulfamazone, sulfamerazine, sulfamethizole, sulfamethoxazole, sulfamethoxypyridazine, sulfametomidine, sulfametoxydiazine, sulfametrole, sulfamoxole, sulfanilamide, sulfaperin, sulfaphenazole, sulfapyridine, sulfathiazole, sulfathiourea, sulfisomidine, teicoplanin, telavancin, tanespimycin, temafloxacin, tetroxoprim, tigecycline, tobramycin, tosufloxacin, trimethoprim, trimethoprim, trovafloxacin, tyrothricin, ulifloxacin, valnemulin, vancomycin, verdamicin, and zabofloxacin; and

n5 is an interger selected from 1to 20.

2. The compound of claim 1 , wherein each A 1 is independently a moiety selected from Formula (A 1 ala), Formula (A 1 a2a), Formula (A 1 a2b), Formula (A 1 a3a), Formula (A 1 a3b), Formula (A 1 b 1a), Formula (A 1 b1b), Formula (A 1 b1c), Formula (A 1 b2a), Formula (A 1 b2b), Formula (A 1 b 2c), Formula (A 1 c I), Formula (A 1 c2), Formula (A 1 c3), Formula (A 1 d1), Formula (A 1 d2), Formula (A 1 d3), Formula (A 1 c1), Formula (A 1 f1), and Formula (A 1 f2):

3. The compound of claim 1 . wherein each X 1 and X 3 is independently selected from a covalent bond, C 1-20 alkanediyl, C 1-20 cycloalkanediyl, C 6-10 arenediyl, C 7-20 alkanearenediyl, and —(CH 2 ) n1 —(CH 2 —CH 2 —O), n2 —(CH 2 ) n3 —, wherein each n1 and n3 is independently an integer selected from 0 to 5 and each n2 is independently an integer selected from 1 to 25.

4. The compound of claim 1 , wherein each X 1 and X 3 is independently selected from a covalent bond, methane-diyl, ethane-1 ,2-diyl, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, benzene-diyl, methylbenzene-diyl, ethylbenzene-diyl, propylbenzcne-diyl, methylcyclohexane-diyl, —(CH 2 ) 2 —(CH 2 —CH 2 —O)—, —(CH 2 ) 2 —(CH 2 —CH 2 —O) 2 —(CH 2 )—, and —(CH 2 ) 2 —(CH 2 —CH 2 —O) 3 —(CH 2 ) 2 —.

5. The compound of claim 1 , wherein each X 2 is selected from a covalent bond, —O—, —S—, —SO—, —SO 2 —, —SO,NH——SS—, —C(O)—, —C(O)O—, —C(O)NH—,C(O)NH—N═, —OC(O)NH—, and —NHC(O)NH—.

6. The compound of claim 1 , wherein each. X 2 is selected from a covalent bond, —O —, —SO 2 NH—, —SS—, —C(O)—, —C(O)O—, and —C(O)NH—.

7. The compound of claim 1 , wherein each R 1 and R 2 is independently selected from hydrogen, methyl, ethyl, propyl, isopropyl, and phenyl.

8. The compound of claim 1 , wherein the compound is selected from the compound of Formula (II-A-1), Formula (II-A-2), Formula (II-A-3), Formula (II-A-4), Formula (II-A-5), Formula (II-A-6), Formula (II-A-7), Formula (II-A-8), Formula (II-A-9), and Formula (II-A-10):

9. The compound of claim 1 , wherein the compound is selected from the compound of Formula (II-B-1), Formula (II-B-2), Formula (II-B-3 ), Formula (II-B-4), Formula (II-B-5), Formula (II-B-6), Formula (II-B-7), Formula (II-B-8), Formula (II-B-9), Formula (II-B-10). Formula (II-B-1 1), Formula (II-13-1 and Formula (II-B-13):

10. The compound of claim 1 , wherein the compound is selected from Formula (II-a), Formula (II-b), Formula (II-c), Formula (II-d), Formula (II-e), Formula (II-f), Formula (II-g), Formula (II-h), Formula (II-i), Formula (II-j), Formula (II-k), Formula (II-l). Formula (II-m), Formula (II-n), Formula (II-o), Formula (II-p), Formula (II-q), Formula (II-r ), Formula (II-s), Formula (II-t), Formula (II-u), Formula (II-v), Formula (II-w), Formula (II-x), Formula (II-y), Formula (II-z), Formula (II-aa), Formula (II-ab), and Formula (II-ac), or a salt of any of the foregoing: