Provided herein are compositions and related methods useful for free radical scavenging, with particular selectivity for mitochondria. The compounds comprise a nitroxide-containing group attached to a mitochondria-targeting group. The compounds can be cross-linked into dimers without loss of activity. Also provided herein are methods, for preventing, mitigating and treating damage caused by radiation. The method comprises delivering a compound, as described herein, to a patient in an amount and dosage regimen effective to prevent, mitigate or treat damage caused by radiation.

Provided herein are compositions and related methods useful for free radical scavenging, with particular selectivity for mitochondria. The compounds comprise a nitroxide-containing group attached to a mitochondria-targeting group. The compounds can be cross-linked into dimers without loss of activity. Also provided herein are methods, for preventing, mitigating and treating damage caused by radiation. The method comprises delivering a compound, as described herein, to a patient in an amount and dosage regimen effective to prevent, mitigate or treat damage caused by radiation.

Provided herein are lipidoid compounds of Formulae (I) and (II), and pharmaceutically acceptable salts, co-crystals, tautomers, stereoisomers, solvates, hydrates, polymorphs, isotopically labeled derivatives, prodrugs, and compositions thereof. Also provided are methods and kits involving the inventive lipidoid compounds, compositions, or formulations for treating and/or preventing diseases (e.g., genetic disease, proliferative disease, hematological disease, neurological disease, painful condition, psychiatric disorder, metabolic disorder, long-term medical condition, inflammatory disease, autoinflammatory disease, liver disease, lung disease, spleen disease, familial amyloid neuropathy, cardiovascular disease, viral infection, infectious disease, fibrotic condition, or autoimmune disease) in a subject, methods for synthesizing the compounds described herein, and compounds described herein synthesized by the synthetic methods described herein. The compounds are effective carriers for the delivery of an agent such as a polynucleotide (e.g., RNA) to a cell.

##STR00001##

##STR00002##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention formula (I) provides lipids having the following structure XXXIII wherein: R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; and E is C(O)O or OC(O). ##STR00001##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention formula (I) provides lipids having the following structure XXXIII wherein: R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; and E is C(O)O or OC(O). ##STR00001##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention formula (I) provides lipids having the following structure XXXIII wherein: R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; and E is C(O)O or OC(O).

##STR00001##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention formula (I) provides lipids having the following structure XXXIII wherein: R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; and E is C(O)O or OC(O).

##STR00001##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention provides lipids having the following structure (I) wherein R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; E is O, S, N(Q), C(O), N(Q)C(O), C(O)N(Q), (Q)N(CO)O, O(CO)N(Q), S(O), NS(O)2N(Q), S(O)2, N(Q)S(O)2, SS, O═N, aryl, heteroaryl, cyclic or heterocycle; and, Q is H, alkyl, ω-aminoalkyl, ω-(substituted)aminoalky, ω-phosphoalkyl or ω-thiophosphoalkyl.

##STR00001##

The present invention provides lipids that are advantageously used in lipid particles for the in vivo delivery of therapeutic agents to cells. In particular, the invention provides lipids having the following structure (I) wherein R.sub.1 and R.sub.2 are each independently for each occurrence optionally substituted C.sub.10-C.sub.30 alkyl, optionally substituted C.sub.10-C.sub.30 alkenyl, optionally substituted C.sub.10-C.sub.30 alkynyl, optionally substituted C.sub.10-C.sub.30 acyl, or -linker-ligand; R.sub.3 is H, optionally substituted C.sub.1-C.sub.10 alkyl, optionally substituted C.sub.2-C.sub.10 alkenyl, optionally substituted C.sub.2-C.sub.10 alkynyl, alkylhetrocycle, alkylphosphate, alkylphosphorothioate, alkylphosphorodithioate, alkylphosphonates, alkylamines, hydroxyalkyls, ω-aminoalkyls, ω-(substituted)aminoalkyls, ω-phosphoalkyls, ω-thiophosphoalkyls, optionally substituted polyethylene glycol (PEG, mw 100-40K), optionally substituted mPEG (mw 120-40K), heteroaryl, heterocycle, or linker-ligand; E is O, S, N(Q), C(O), N(Q)C(O), C(O)N(Q), (Q)N(CO)O, O(CO)N(Q), S(O), NS(O)2N(Q), S(O)2, N(Q)S(O)2, SS, O═N, aryl, heteroaryl, cyclic or heterocycle; and, Q is H, alkyl, ω-aminoalkyl, ω-(substituted)aminoalky, ω-phosphoalkyl or ω-thiophosphoalkyl.

##STR00001##

Provided herein are lipidoid compounds of Formulae (I) and (II), and pharmaceutically acceptable salts, co-crystals, tautomers, stereoisomers, solvates, hydrates, polymorphs, isotopically labeled derivatives, prodrugs, and compositions thereof. Also provided are methods and kits involving the inventive lipidoid compounds, compositions, or formulations for treating and/or preventing diseases (e.g., genetic disease, proliferative disease, hematological disease, neurological disease, painful condition, psychiatric disorder, metabolic disorder, long-term medical condition, inflammatory disease, autoinflammatory disease, liver disease, lung disease, spleen disease, familial amyloid neuropathy, cardiovascular disease, viral infection, infectious disease, fibrotic condition, or autoimmune disease) in a subject, methods for synthesizing the compounds described herein, and compounds described herein synthesized by the synthetic methods described herein. The compounds are effective carriers for the delivery of an agent such as a polynucleotide (e.g., RNA) to a cell. ##STR00001##