Protein degraders and uses thereof

A compound of formula I-d:

• or a pharmaceutically acceptable salt thereof, wherein:
• X1 is a bivalent moiety selected from a covalent bond, —CH2—, —CHCF3—, —SO2—, —S(O)—, —P(O)R—, —P(O)OR—, —P(O)NR2—, —C(O)—, —C(S)—, or
• X2 is a carbon atom or silicon atom;
• X3 is a bivalent moiety selected from —CR2—, —NR—, —O—, —S—, or —Si(R2)—;
• R1 is hydrogen, deuterium, halogen, —CN, —OR, —SR, —S(O)R, —S(O)2R, —N(R)2, —P(O)(OR)2, —P(O)(NR2)OR, —P(O)(NR2)2, —Si(OH)2R, —Si(OH)(R)2, —Si(R)3, or an optionally substituted C1-4 aliphatic;
• each R is independently hydrogen, or an optionally substituted group selected from C1-6 aliphatic, phenyl, a 4-7 membered saturated or partially unsaturated heterocyclic having 1-2 heteroatoms independently selected from nitrogen, oxygen, and sulfur, and a 5-6 membered heteroaryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur, or:
• two R groups on the same nitrogen are taken together with their intervening atoms to form a 4-7 membered saturated, partially unsaturated, or heteroaryl ring having 0-3 heteroatoms, in addition to the nitrogen, independently selected from nitrogen, oxygen, and sulfur;
• each R2 is independently hydrogen, deuterium, —R3, halogen, —CN, —NO2, —OR, —SR, —N(R)2, —Si(R)3, —S(O)2R, —S(O)2N(R)2, —S(O)R, —C(O)R, —C(O)OR, —C(O)N(R)2, —C(O)N(R)OR, —C(R)2N(R)C(O)R, —C(R)2N(R)C(O)N(R)2, —OC(O)R, —OC(O)N(R)2, —OP(O)R2, —OP(O)(OR)2, —OP(O)(OR)(NR2), —OP(O)(NR2)2—, —N(R)C(O)OR, —N(R)C(O)R, —N(R)C(O)N(R)2, —N(R)S(O)2R, —NP(O)R2, —N(R)P(O)(OR)2, —N(R)P(O)(OR)(NR2), —N(R)P(O)(NR2)2, or —N(R)S(O)2R;
• each R3 is independently an optionally substituted group selected from C1-6 aliphatic, phenyl, a 4-7 membered saturated or partially unsaturated heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, and sulfur, and a 5-6 membered heteroaryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur;
• Ring A is
• wherein
• each of Ring B and Ring C is independently a fused ring selected from 6-membered aryl, 6-membered heteroaryl containing 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur, 5 to 7-membered saturated or partially unsaturated carbocyclyl, 5 to 7-membered saturated or partially unsaturated heterocyclyl ring with 1-3 heteroatoms independently selected from boron, nitrogen, oxygen, silicon, and sulfur, and 5-membered heteroaryl with 1-4 heteroatoms independently selected from nitrogen, oxygen and sulfur;
• L1 is a covalent bond or a C1-3 bivalent straight or branched saturated or unsaturated hydrocarbon chain wherein 1-2 methylene units of the chain are independently and optionally replaced with —O—, —C(O)—, —C(S)—, —CR2—, —CFR—, —CF2—, —NR—, —S—, —S(O)2— or —CR═CR—;
• m is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16;
• L is a covalent bond or a bivalent, saturated or unsaturated, straight or branched C1-50 hydrocarbon chain, wherein 0-6 methylene units of L are independently replaced by —C(D)(H)—, —C(D)2- , -Cy-, —O—, —NR—, —Si(R)2—, —Si(OH)(R)—, —Si(OH)2—, —P(O)(OR)—, —P(O)(R)—, —P(O)(NR2)—, —S—, —OC(O)—, —C(O)O—, —C(O)—, —S(O)—, —S(O)2—, —NRS(O)2—, —S(O)2NR—, —NRC(O)—, —C(O)NR—, —OC(O)NR—, —NRC(O)O—,
• wherein:
• each -Cy- is independently an optionally substituted bivalent ring selected from phenylenyl, an 8-10 membered bicyclic arylenyl, a 4-7 membered saturated or partially unsaturated carbocyclylenyl, a 4-7 membered saturated or partially unsaturated spiro carbocyclylenyl, an 8-10 membered bicyclic saturated or partially unsaturated carbocyclylenyl, a 4-7 membered saturated or partially unsaturated heterocyclylenyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, and sulfur, a 4-7 membered saturated or partially unsaturated spiro heterocyclylenyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, and sulfur, an 8-10 membered bicyclic saturated or partially unsaturated heterocyclylenyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, and sulfur, a 5-6 membered heteroarylenyl having 1-4 heteroatoms independently selected from nitrogen, oxygen, and sulfur, and an 8-10 membered bicyclic heteroarylenyl having 1-5 heteroatoms independently selected from nitrogen, oxygen, and sulfur;
• each of n is independently 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10;
• and
• TBM is a target binding moiety, wherein the target binding moiety is a BRD4 binding moiety.