Modulators of indoleamine 2,3-dioxygenase and methods of using the same

A method of treating a cancer selected from lung cancer, renal cancer, and cancer of the head and neck in a patient in need thereof, comprising administering to said patient a therapeutically effective amount of a compound of formula:

• or a pharmaceutically acceptable salt thereof, in combination with an anti-PD-1 antibody,
• wherein:
• W, X1, and X2 are independently selected from (CRaRb)t, (CRaRb)uO(CRaRb)v, (CRaRb)uC(O)(CRaRb)v, (CRaRb)uC(O)NR(CRaRb)v, (CRaRb)uC(O)O(CRaRb)v, (CRaRb)uC(S)(CRaRb)u, (CRaRb)uC(S)NRc(CRaRb)v, (CRaRb)uS(O)(CRaRb)v, (CRaRb)uS(O)NRc(CRaRb)v, (CRaRb)uS(O)2(CRaRb)v, (CRaRb)uS(O)2NRc(CRaRb)v, (CRaRb)uNRc(CRaRb)v, and (CRaRb)uC(═NRd)NRc(CRaRb)v;
• R2 is H, C1-6 alkyl, or C3-7 cycloalkyl;
• R3a and R5a are independently selected from C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl, each optionally substituted by 1, 2, 3, 4 or 5 substituents independently selected from halo, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-4 haloalkyl, Cy1, CN, NO2, ORe1, SRe1, C(O)Rf1, C(O)NRg1Rh1, C(O)ORe1, OC(O)Rf1, OC(O)NRg1Rh1, NRg1C(O)NRg1Rh1, NRg1Rh1, NRg1C(O)Rf1, NRg1C(O)ORe1, P(Rf1)2, P(ORe1)2, P(O)Re1Rf1, P(O)ORe1ORf1, S(O)Rf1, S(O)NRg1Rh1, S(O)2Rf1, and S(O)2NRg1Rh1;
• R3b is aryl or heteroaryl, each optionally substituted by 1, 2, 3, 4 or 5 substituents independently selected from halo, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-4 haloalkyl, Cy2, CN, NO2, ORe1, SRe1, C(O)Rf1, C(O)NRg1Rh1, C(O)ORe1, OC(O)Rf1, OC(O)NRg1Rh1, NRg1C(O)NRg1Rh1, NRg1Rh1, NRg1C(O)Rf1, NRg1C(O)ORe1, P(Rf1)2, P(ORe1)2, P(O)Re1Rf1, P(O)ORe1ORf1, S(O)Rf1, S(O)NRg1Rh1, S(O)2Rf1, and S(O)2NRg1Rh1;
• R5b is selected from H, C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl, wherein said C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl are each optionally substituted by 1, 2, 3, 4 or 5 substituents independently selected from halo, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-4 haloalkyl, Cy2, CN, NO2, ORe1, SRe1, C(O)Rf1, C(O)NRg1Rh1, C(O)ORe1, OC(O)Rf1, OC(O)NRg1Rh1, NRg1C(O)NRg1Rh1, NRg1Rh1, NRg1C(O)Rf1, NRg1C(O)ORe1, P(Rf1)2, P(ORe1)2, P(O)Re1Rf1, P(O)ORe1ORf1, S(O)Rf1, S(O)NRg1Rh1, S(O)2Rf1, and S(O)2NRg1Rh1;
• Cy1 and Cy2 are independently selected from aryl, heteroaryl, cycloalkyl, and heterocycloalkyl, each optionally substituted by 1, 2, 3, 4 or 5 substituents independently selected from halo, C1-4 alkyl, C2-4 alkenyl, C2-4 alkynyl, C1-4 haloalkyl, CN, NO2, ORe3, SRe3C(O)Rf3, C(O)NRg3Rh3, C(O)ORe3, OC(O)Rf3, OC(O)NRg3Rh3, NRg3Rh3, NRg3C(O)Rh3, NRg3C(O)ORe3, P(Rf3)2, P(ORe3)2, P(O)Re3Rf3, P(O)ORe3ORf3, S(O)Rf3, S(O)NRg3Rh3, S(O)2Rf3, and S(O)2NRg3Rh3;
• Ra and Rb are independently selected from H, halo, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-4 haloalkyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, heterocycloalkylalkyl, CN, NO2, ORe4, SRe4, C(O)Rf4, C(O)NRg4Rh4, C(O)ORe4OC(O)Rf4, OC(O)NRg4Rh4, NRg4Rh4, NRg4C(O)Rh4, NRg4C(O)ORe4, P(Rf4)2, P(ORe4)2, P(O)Re4Rf4, P(O)ORe4ORf4, S(O)Rf4, S(O)NRg4Rh4, S(O)2Rf4, and S(O)2NRg4Rh4;
• Rc is H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
• Rd is H, ORd1, CN or NO2;
• Rd1 is H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
• Re1, Re3, and Re4 are independently selected from H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, (C1-6 alkoxy)-C1-6 alkyl, C2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl and heterocycloalkylalkyl;
• Rf1, Rf3, and Rf4 are independently selected from H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, heteroaryl and heterocycloalkyl;
• Rg1, Rg3, and Rg4 are independently selected from H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, and cycloalkylalkyl;
• Rh1, Rh3, and Rh4 are independently selected from H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, and cycloalkylalkyl;
• or Rg1 and Rh1 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;
• or Rg3 and Rh3 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;
• or Rg4 and Rh4 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;
• a is 0 or 1;
• b is 0 or 1;
• m is 1;
• n is 0 or 1;
• p is 0 or 1;
• t is, independently, 1, 2, 3, 4, 5 or 6;
• u is, independently, 0, 1, 2, 3, 4, 5 or 6;
• and
• v is, independently, 0, 1, 2, 3, 4, 5 or 6.