Prodrugs of 2,4-Pyrimidinediamine Compounds and Their Uses

A compound of formula (I):

• of a salt, solvate, hydrate, or N-oxide thereof, wherein
• Y is selected from CH2, NR24, O, S, S(O) and S(O)2;
• Z1 and Z2 are each, independently of one another, selected from CH and N;
• R2 is selected from lower alkyl optionally substituted with one or more of the same or different R8 groups, lower cycloalkyl optionally substituted with one or more of the same or different R8 groups, cyclohexyl optionally substituted with one or more of the same or different R8 groups, 3-8 membered cycloheteroalkyl optionally substituted with one or more of the same or different R8 groups, (C6-C14) aryl optionally substituted with one or more of the same or different R8 groups, phenyl optionally substituted with one or more of the same or different R8 groups and 5-15 membered heteroaryl optionally substituted with one or more of the same or different R8 groups;
• R5 is selected from halo, fluoro, cyano, nitro, trihalomethyl and trifluoromethyl;
• R8 is selected from Ra, Rb, Ra substituted with one or more, for example, from one to four, of the same or different Ra or Rb, —ORa substituted with one or more of the same or different Ra or Rb, —B(ORa)2, —B(NRcRc)2, —(CH2)m—Rb, —(CHRa)m—Rb, —O—(CH2)m—Rb, —S—(CH2)m—Rb, —O—CHRaRb, —O—CRa(Rb)2, —O—(CHRa)m—Rb, —O—(CH2)m—CH[(CH2)mRb]Rb, —S—(CHRa)m—Rb, —C(O)NH—(CH2)m—Rb, —C(O)NH—(CHRa)m—Rb, —O—(CH2)m—C(O)NH—(CH2)m—Rb, —S—(CH2)m—C(O)NH—(CH2)m—Rb, —O—(CHRa)m—C(O)NH—(CHRa)m—Rb, —S—(CHRa)m—C(O)NH—(CHRa)m—Rb, —NH—(CH2)m—Rb, —NH—(CHRa)m—Rb, —NH[(CH2)mRb], —N[(CH2)mRb]2, —NH—C(O)—NH—(CH2)m—Rb, —NH—C(O)—(CH2)m—CHRbRb and —NH—(CH2)m—C(O)—NH—(CH2)m—Rb;
• R17 is selected from hydrogen, halogen, fluoro, lower alkyl and methyl or, alternatively, R17 may be taken together with R18 to form an oxo (═O) group or, together with the carbon atom to which they are attached, a spirocycle containing from 3 to 7 carbon atoms;
• R18 is selected from hydrogen, halogen, fluoro, lower alkyl and methyl or, alternatively, R18 may be taken together with R17 to form an oxo (═O) group or, together with the carbon atom to which they are attached, a spirocycle containing from 3 to 7 carbon atoms;
• R19 is selected from hydrogen, lower alkyl, and methyl or, alternatively, R19 may be taken together with R20 to form an oxo (═O) group or, together with the carbon atom to which they are attached, a spirocycle containing from 3 to 7 carbon atoms;
• R20 is selected from hydrogen, lower alkyl and methyl or, alternatively, R20 may be taken together with R19 to form an oxo (═O) group or, together with the carbon atom to which they are attached, a spirocycle containing from 3 to 7 carbon atoms;
• each Ra is, independently of the others, selected from hydrogen, lower alkyl, lower cycloalkyl, cyclohexyl, (C4-C11) cycloalkylalkyl, (C6-C10) aryl, phenyl, (C7-C16) arylalkyl, benzyl, 2-6 membered heteroalkyl, 3-8 membered cycloheteroalkyl, morpholinyl, piperazinyl, homopiperazinyl, piperidinyl, 4-11 membered cycloheteroalkylalkyl, 5-10 membered heteroaryl and 6-16 membered heteroarylalkyl;
• each Rb is a suitable group independently selected from ═O, —ORa, (C1-C3) haloalkyloxy, ═S, —SRa, ═NRa, ═NORa, —NRcRc, halogen, —CF3, —CN, —NC, —OCN, —SCN, —NO, —NO2, ═N2, —N3, —S(O)Ra, —S(O)2Ra, —S(O)2ORa, —S(O)NRcRc, —S(O)2NRcRc, —OS(O)Ra, —OS(O)2Ra, —OS(O)2ORa, —OS(O)2NRcRc, —C(O)Ra, —C(O)ORa, —C(O)NRcRc, —C(NH)NRcRc, —C(NRa)NRcRc, —C(NOH)Ra, —C(NOH)NRcRc, —OC(O)Ra, —OC(O)ORa, —OC(O)NRcRc, —OC(NH)NRcRc, —OC(NRa)NRcRc, —[NHC(O)]nRa, —[NRaC(O)]nRa, —[NHC(O)]nORa, —[NRaC(O)]nORa, —[NHC(O)]nNRcRc, —[NRaC(O)]nNRcRc, —[NHC(NH)]nNRcRc and —[NRaC(NRa)]nNRcRc;
• each Rc is, independently of the others, selected from a protecting group and Ra, or, alternatively, the two Rc bonded to the same nitrogen atom are taken together with that nitrogen atom to form a 5 to 8-membered cycloheteroalkyl or heteroaryl which may optionally include one or more of the same or different additional heteroatoms and which may optionally be substituted with one or more, for example, from one to four, of the same or different Ra groups;
• R21, R22 and R23 are each, independently of one another, selected from hydrogen and a progroup RP;
• R24 is selected from hydrogen, lower alkyl and progroup RP;
• each m is, independently of the others, an integer from 1 to 3;
• and
• each n is, independently of the others, an integer from 0 to 3, with the proviso that at least one of R21, R22, R23 and R24 is a progroup.