Benzo[b]thiophene compounds as STING agonists

A method of inducing an immune response in a subject, said method comprising:

• (a) administering a therapeutically effective amount of a pharmaceutical composition to the subject, said pharmaceutical composition comprising a compound according to formula (I′) to the subject, wherein the compound of formula (I′) is
• or a pharmaceutically acceptable salt thereof, wherein
• R1 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• R2 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R3 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R4 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• optionally R3 and R4 may be taken together with the atoms to which they are attached form a 5- or 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6) wherein said heterocyclic ring is optionally substituted with or more members of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R5 is selected from H, halogen, OR6, N(R6)2, CN, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• each R6 is independently selected from the group consisting of H, C1-C6 alkyl, and C1-C6 haloalkyl, wherein said C1-C6 alkyl, and C1-C6 haloalkyl are optionally substituted with OH, O(C1-C3 alkyl), O(C1-C3 haloalkyl);
• X1 is C(O);
• X2 is (C(R8)2)(1-3);
• each R8 is independently selected from the group consisting of H, halogen, CN, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• optionally 2 R8 on different carbon atoms may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered fused ring;
• optionally 2 R8 on a single carbon atom may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered spirocycle;
• X3 is selected from the group consisting of COOR6,
• C(O)SR6, C(S)OR6, SO2R6, and C(O)N(R9)2;
• and
• each R9 is independently selected from the group consisting of H, COOR6, and SO2R6.

A method of inducing STING-dependent type I interferon production in a subject, said method comprising administering a therapeutically effective amount of a compound according to formula (I′) to the subject, wherein the compound of formula (I′) is

• or a pharmaceutically acceptable salt thereof, wherein
• R1 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• R2 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R3 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R4 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• optionally R3 and R4 may be taken together with the atoms to which they are attached form a 5- or 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6) wherein said heterocyclic ring is optionally substituted with or more members of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R5 is selected from H, halogen, OR6, N(R6)2, CN, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• each R6 is independently selected from the group consisting of H, C1-C6 alkyl, and C1-C6 haloalkyl, wherein said C1-C6 alkyl, and C1-C6 haloalkyl are optionally substituted with OH, O(C1-C3 alkyl), O(C1-C3 haloalkyl);
• X1 is C(O);
• X2 is (C(R8)2)(1-3);
• each R8 is independently selected from the group consisting of H, halogen, CN, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• optionally 2 R8 on different carbon atoms may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered fused ring;
• optionally 2 R8 on a single carbon atom may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered spirocycle;
• X3 is selected from the group consisting of COOR6,
• C(O)SR6, C(S)OR6, SO2R6, and C(O)N(R9)2;
• and
• each R9 is independently selected from the group consisting of H, COOR6, and SO2R6.

A method of inducing STING-dependent type I interferon production in a subject, said method comprising administering a therapeutically effective amount of a pharmaceutical composition to the subject, said pharmaceutical composition comprising a compound according to formula (I′) to the subject, wherein the compound of formula (I′) is

• or a pharmaceutically acceptable salt thereof, wherein
• R1 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• R2 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R3 is selected from the group consisting of H, halogen, CN, OR6, N(R6)2, COOR6, C(O)N(R6)2, SR6, SO2R6, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R4 is selected from the group consisting of H, halogen, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• optionally R3 and R4 may be taken together with the atoms to which they are attached form a 5- or 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6) wherein said heterocyclic ring is optionally substituted with or more members of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• R5 is selected from H, halogen, OR6, N(R6)2, CN, C1-C6 alkyl substituted by OR6, C1-C6 alkyl substituted by SR6, C1-C6 alkyl substituted by N(R6)2, C1-C6 haloalkyl substituted by OR6, C1-C6 haloalkyl substituted by SR6, and C1-C6 haloalkyl substituted by N(R6)2;
• each R6 is independently selected from the group consisting of H, C1-C6 alkyl, and C1-C6 haloalkyl, wherein said C1-C6 alkyl, and C1-C6 haloalkyl are optionally substituted with OH, O(C1-C3 alkyl), O(C1-C3 haloalkyl);
• X1 is C(O);
• X2 is (C(R8)2)(1-3);
• each R8 is independently selected from the group consisting of H, halogen, CN, OR6, N(R6)2, SR6, C1-C6 alkyl, C1-C6 haloalkyl, C3-C6 cycloalkyl, and a 3- to 6-membered heterocyclic ring including 1 to 2 ring members selected from the group consisting of O, S, N, and N(R6), wherein said C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C3-C6 cycloalkyl, and 3- to 6-membered heterocyclic ring groups are optionally substituted by one or more substituents independently selected from the group consisting of CN, OR6, N(R6)2, and SR6, and wherein said C3-C6 cycloalkyl and 3- to 6-membered heterocyclic ring are each further optionally substituted with a member of the group consisting of C1-C3 alkyl and C1-C3 haloalkyl;
• optionally 2 R8 on different carbon atoms may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered fused ring;
• optionally 2 R8 on a single carbon atom may be taken together, along with the atoms to which they are attached, to form a 3- to 6-membered spirocycle;
• X3 is selected from the group consisting of COOR6,
• C(O)SR6, C(S)OR6, SO2R6, and C(O)N(R9)2;
• and
• each R9 is independently selected from the group consisting of H, COOR6, and SO2R6.