WO2012054365A2 - Novel low molecular weight cationic lipids for oligonucleotide delivery - Google Patents

Novel low molecular weight cationic lipids for oligonucleotide delivery Download PDF

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WO2012054365A2
WO2012054365A2 PCT/US2011/056502 US2011056502W WO2012054365A2 WO 2012054365 A2 WO2012054365 A2 WO 2012054365A2 US 2011056502 W US2011056502 W US 2011056502W WO 2012054365 A2 WO2012054365 A2 WO 2012054365A2
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Prior art keywords
alkyl
lipid
sirna
cationic lipids
alkenyl
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PCT/US2011/056502
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French (fr)
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WO2012054365A3 (en
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Steven L. Colletti
Matthew G. Stanton
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Merck Sharp & Dohme Corp.
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Priority to EP18204838.9A priority Critical patent/EP3485913A1/en
Application filed by Merck Sharp & Dohme Corp. filed Critical Merck Sharp & Dohme Corp.
Priority to AU2011318289A priority patent/AU2011318289A1/en
Priority to CA2813024A priority patent/CA2813024A1/en
Priority to EP11834914.1A priority patent/EP2629802B1/en
Priority to US13/880,254 priority patent/US9029590B2/en
Priority to KR1020137009957A priority patent/KR20130124308A/en
Priority to JP2013534981A priority patent/JP2013545727A/en
Priority to CN2011800500153A priority patent/CN103153347A/en
Publication of WO2012054365A2 publication Critical patent/WO2012054365A2/en
Publication of WO2012054365A3 publication Critical patent/WO2012054365A3/en
Priority to US14/682,494 priority patent/US9458090B2/en
Priority to US15/282,294 priority patent/US9981907B2/en
Priority to US15/926,936 priority patent/US20180208545A1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C229/00—Compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C229/02—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton
    • C07C229/04—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated
    • C07C229/06—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having only one amino and one carboxyl group bound to the carbon skeleton
    • C07C229/10—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having only one amino and one carboxyl group bound to the carbon skeleton the nitrogen atom of the amino group being further bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings
    • C07C229/12—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having only one amino and one carboxyl group bound to the carbon skeleton the nitrogen atom of the amino group being further bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings to carbon atoms of acyclic carbon skeletons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
    • A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
    • A61K31/22—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin
    • A61K31/221—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin with compounds having an amino group, e.g. acetylcholine, acetylcarnitine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/44—Oils, fats or waxes according to two or more groups of A61K47/02-A61K47/42; Natural or modified natural oils, fats or waxes, e.g. castor oil, polyethoxylated castor oil, montan wax, lignite, shellac, rosin, beeswax or lanolin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
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    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/87—Introduction of foreign genetic material using processes not otherwise provided for, e.g. co-transformation
    • C12N15/88—Introduction of foreign genetic material using processes not otherwise provided for, e.g. co-transformation using microencapsulation, e.g. using amphiphile liposome vesicle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy

Abstract

The instant invention provides for novel cationic lipids that can be used in combination with other lipid components such as cholesterol and PEG-lipids to form lipid nanoparticles with oligonucleotides. It is an object of the instant invention to provide a cationic lipid scaffold that demonstrates enhanced efficacy along with lower liver toxicity as a result of lower lipid levels in the liver. The present invention employs low molecular weight cationic lipids comprising at least one short lipid chain to enhance the efficiency and tolerability of in vivo delivery of siRNA.

Description

TITLE OF THE INVENTION
NOVEL LOW MOLECULAR WEIGHT CATIONIC LIPIDS FOR OLIGONUCLEOTIDE DELIVERY BACKGROUND OF THE INVENTION
The present invention relates to novel cationic lipids that can be used in combination with other lipid components such as cholesterol and PEG-lipids to form lipid nanoparticles with oligonucleotides, to facilitate the cellular uptake and endosomal escape, and to knockdown target mRNA both in vitro and in vivo.
Cationic lipids and the use of cationic lipids in lipid nanoparticles for the delivery of oligonucleotides, in particular siRNA and miRNA, have been previously disclosed. Lipid nanoparticles and use of lipid nanoparticles for the delivery of oligonucleotides, in particular siRNA and miRNA, has been previously disclosed. Oligonucleotides (including siRNA and miRNA) and the synthesis of oligonucleotides has been previously disclosed. (See US patent applications: US 2006/0083780, US 2006/0240554, US 2008/0020058, US
2009/0263407 and US 2009/0285881 and PCT patent applications: WO 2009/086558, WO2009/127060, WO2009/132131, WO2010/042877, WO2010/054384, WO2010/054401, WO2010/054405, WO2010/054406 and WO2010/105209). See also Semple S. C. et al., Rational design of cationic lipids for siRNA delivery, Nature Biotechnology, published online 17 January 2010; doi:10.1038/nbt.l602.
Other cationic lipids are disclosed in US patent applications: US 2009/0263407, US 2009/0285881, US 2010/0055168, US 2010/0055169, US 2010/0063135, US
2010/0076055, US 2010/0099738 and US 2010/0104629.
Further, the cationic lipid DLin-M-C3-DMA (i.e., (6Z,9Z,28Z,31Z>- heptatriaconta-6,9,28,31-tetraen-19yl 4-(dimethylamino)butanoate) is disclosed in
WO2010/105209.
Traditional cationic lipids such as CLinDMA and DLinDMA have been employed for siRNA delivery to liver but suffer from non-optimal delivery efficiency along with liver toxicity at higher doses. It is an object of the instant invention to provide a cationic lipid scaffold that demonstrates enhanced efficacy along with lower liver toxicity as a result of lower lipid levels in the liver. The present invention employs low molecular weight cationic lipids comprising at least one short lipid chain to enhance the efficiency and tolerability of in vivo delivery of siRNA.
SUMMARY OF THE INVENTION
The instant invention provides for novel cationic lipids that can be used in combination with other lipid components such as cholesterol and PEG-lipids to form lipid nanoparticles with oligonucleotides. It is an object of the instant invention to provide a cationic lipid scaffold that demonstrates enhanced efficacy along with lower liver toxicity as a result of lower lipid levels in the liver. The present invention employs low molecular weight cationic lipids with one short lipid chain to enhance the efficiency and tolerability of in vivo delivery of siRNA.
BRIEF DESCRIPTION OF THE FIGURES FIGURE 1 : LNP (Compound 1) efficacy in mice.
FIGURE 2: LNP (Compound 2) efficacy in rats.
FIGURE 3: Lipid (Compound 2) levels in rat liver.
DETAILED DESCRIPTION OF THE INVENTION
The various aspects and embodiments of the invention are directed to the utility of novel cationic lipids useful in lipid nanoparticles to deliver oligonucleotides, in particular, siRNA and miRNA, to any target gene. (See US patent applications: US 2006/0083780, US 2006/0240554, US 2008/0020058, US 2009/0263407 and US 2009/0285881 and PCT patent applications: WO 2009/086558, WO2009/127060, WO2009/132131, WO2010/042877, WO2010/054384, WO2010/054401, WO2010/054405, WO2010/054406 and
WO2010/105209). See also Semple S. C. et al., Rational design of cationic lipids for siRNA delivery, Nature Biotechnology, published online 17 January 2010; doi:10.1038/nbt.l602.
The cationic lipids of the instant invention are useful components in a lipid nanoparticle for the delivery of oligonucleotides, specifically siRNA and miRNA.
In a first embodiment of this invention, the cationic lipids are illustrated by the
Formula A:
Figure imgf000004_0001
wherein:
R1 and R2 are independently selected from H, (C1-C6)alkyl, heterocyclyl, and polyamine, wherein said alkyl, heterocyclyl and polyamine are optionally substituted with one to three substituents selected from R', or R1 and R2 can be taken together with the nitrogen to which they are attached to form a monocyclic heterocycle with 4-7 members optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said monocyclic heterocycle is optionally substituted with one to three substituents selected from R'; R3 is selected from H and (C1-C6)alkyl, said alkyl optionally substituted with one to three substituents selected from R';
R' is independently selected from halogen, R", OR", SR", CN, CO2R" and
CON(R")2;
R" is independently selected from H and (C1-C6)alkyl, wherein said alkyl is optionally substituted with halogen and OH;
n is O, 1, 2, 3, 4 or 5;
X is selected from O, NR", (C=O)O, NR"(C=O), O(C=O)O, NR"(C=O)NR",
O(C=O)NR", and NR" (C=O)O;
L1 is selected from C4-C24 alkyl and C4-C24 alkenyl, said alkyl and alkenyl are optionally substituted with one or more substituents selected from R'; and
L2 is selected from C3-C9 alkyl and C3-C9 alkenyl, said alkyl and alkenyl are optionally substituted with one or more substituents selected from R';
or any pharmaceutically acceptable salt or stereoisomer thereof.
In a second embodiment, the invention features a compound having Formula A, wherein:
R1 and R2 are each methyl;
R3 is H;
n is 3;
X is (C=O)O;
L1 is selected from C4-C24 alkyl and C4-C24 alkenyl; and
L2 is selected from C3-C9 alkyl and C3-C9 alkenyl;
or any pharmaceutically acceptable salt or stereoisomer thereof.
Specific cationic lipids are:
(20Z,23Z)-nonacosa-20,23-dien-10-yl 4-(dime1hylamino)butanoate (Compound 1); and (18Z)-heptacos- 18-en-10-yl 4-(dimethylamino)butanoate (Compound 2);
or any pharmaceutically acceptable salt or stereoisomer thereof.
In another embodiment, the cationic lipids disclosed are useful in the preparation of lipid nanoparticles.
In another embodiment, the cationic lipids disclosed are useful components in a lipid nanoparticle for the delivery of oligonucleotides.
In another embodiment, the cationic lipids disclosed are useful components in a lipid nanoparticle for the delivery of siRNA and miRNA.
In another embodiment, the cationic lipids disclosed are useful components in a lipid nanoparticle for the delivery of siRNA.
The cationic lipids of the present invention may have asymmetric centers, chiral axes, and chiral planes (as described in: E.L. Eliel and S.H. Wilen, Stereochemistry of Carbon Compounds, John Wiley & Sons, New York, 1994, pages 1119-1190), and occur as racemates, racemic mixtures, and as individual diastereomers, with all possible isomers and mixtures thereof, including optical isomers, being included in the present invention. In addition, the cationic lipids disclosed herein may exist as tautomers and both tautomeric forms are intended to be encompassed by the scope of the invention, even though only one tautomeric structure is depicted.
It is understood that substituents and substitution patterns on the cationic lipids of the instant invention can be selected by one of ordinary skill in the art to provide cationic lipids that are chemically stable and that can be readily synthesized by techniques known in the art, as well as those methods set forth below, from readily available starting materials. If a substituent is itself substituted with more than one group, it is understood that these multiple groups may be on the same carbon or on different carbons, so long as a stable structure results.
It is understood that one or more Si atoms can be incorporated into the cationic lipids of the instant invention by one of ordinary skill in the art to provide cationic lipids that are chemically stable and that can be readily synthesized by techniques known in the art from readily available starting materials.
In the compounds of Formula A, the atoms may exhibit their natural isotopic abundances, or one or more of the atoms may be artificially enriched in a particular isotope having the same atomic number, but an atomic mass or mass number different from the atomic mass or mass number predominantly found in nature. The present invention is meant to include all suitable isotopic variations of the compounds of Formula A. For example, different isotopic forms of hydrogen (H) include protium (lH) and deuterium (2H). Protium is the predominant hydrogen isotope found in nature. Enriching for deuterium may afford certain therapeutic advantages, such as increasing in vivo half-life or reducing dosage requirements, or may provide a compound useful as a standard for characterization of biological samples. Isotopically- enriched compounds within Formula A can be prepared without undue experimentation by conventional techniques well known to those skilled in the art or by processes analogous to those described in the Scheme and Examples herein using appropriate isotopically-enriched reagents and/or intermediates.
As used herein, "alkyl" means a straight chain, cyclic or branched saturated aliphatic hydrocarbon having the specified number of carbon atoms.
As used herein, "alkenyl" means a straight chain, cyclic or branched unsaturated aliphatic hydrocarbon having the specified number of carbon atoms including but not limited to diene, triene and tetraene unsaturated aliphatic hydrocarbons.
Examples of a cyclic "alkyl" or "alkenyl are:
Figure imgf000007_0001
As used herein, "heterocyclyl" or "heterocycle" means a 4- to 10-membered aromatic or nonaromatic heterocycle containing from 1 to 4 heteroatoms selected from the group consisting of O, N and S, and includes bicyclic groups. "Heterocyclyl" therefore includes, the following: benzoimidazolyl, benzofuranyl, berizofurazanyl, benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzoxazolyl, carbazolyl, carbolinyl, cinnolinyl, furanyl, imidazolyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuranyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxazoline, isoxazoline, oxetanyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridopyridinyl, pyridazinyl, pyridyl, pyrimidyl, pyrrolyl, quinazolinyl, quinolyl, quinoxalinyl, tetrahydropyranyl, tetrazolyl, tetrazolopyridyl, tbiadiazolyl, thiazolyl, thienyl, triazolyl, azetidinyl, 1,4-dioxanyl,
hexahydroazepinyl, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl, thiomorpholinyl, dihydrobenzoirmdazolyl, dihydrobenzofuranyl, dihydrobenzothiophenyl, dihydrobenzoxazolyl, dihydrofuranyl, dihydroimidazolyl, dihydroindolyl, dihydroisooxazolyl, dihydroisothiazolyl, dihydrooxadiazolyl, dihydrooxazolyl, dihydropyrazinyl, dihydropyrazolyl, dihydropyridinyl, dihydropyrimidinyl, dihydropyrrolyl, dihydroquinolinyl, dihydrotetrazolyl, dihydrothiadiazolyl, dihydrothiazolyl, dihydrothienyl, dihydrotriazolyl, dihydroazetidinyl, methylenedioxybenzoyl, tetrahydrofuranyl , and tetrahydrothienyl, and N -oxides thereof all of which are optionally substituted with one to three substituents selected from R".
As used herein, "polyamine" means compounds having two or more amino groups. Examples include putrescine, cadaverine, spermidine, and spermine.
As used herein, "halogen" means Br, CI, F and I.
In an embodiment of Formula A, R1 and R2 are independently selected from H and (C1-C6)alkyl, wherein said alkyl is optionally substituted with one to three substituents selected from R1, or R1 and R2 can be taken together with the nitrogen to which they are attached to form a monocyclic heterocycle with 4-7 members optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said monocyclic heterocycle is optionally substituted with one to three substituents selected from R'.
In an embodiment of Formula A, R1 and R2 are independently selected from H, methyl, ethyl and propyl, wherein said methyl, ethyl and propyl are optionally substituted with one to three substituents selected from R', or R1 and R2 can be taken together with the nitrogen to which they are attached to form a monocyclic heterocycle with 4-7 members optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said monocyclic heterocycle is optionally substituted with one to three substituents selected from R'. In an embodiment of Formula A, R1 and R2 are independently selected from H, methyl, ethyl and propyl.
In an embodiment of Formula A, R1 and R2 are each methyl.
In an embodiment of Formula A, R3 is independently selected from: H and methyl.
In an embodiment of Formula A, R3 is H.
In an embodiment of Formula A, R' is R".
In an embodiment of Formula A, R" is independently selected from H, methyl, ethyl and propyl, wherein said methyl, ethyl and propyl are optionally substituted with one or more halogen and OH.
In an embodiment of Formula A, R" is independently selected from H, methyl, ethyl and propyl.
In an embodiment of Formula A, n is 0, 1, 2, 3 or 4.
In an embodiment of Formula A, n is 2, 3 or 4.
In an embodiment of Formula A, n is 3.
In an embodiment of Formula A, X is O, NR", (C=O)O, NR"(C=O), O(C=O)O, NR"(C=O)NR", O(C=O)NR", or NR"(C=O)O.
In an embodiment of Formula A, X is (C=O)O.
In an embodiment of Formula A, Li is selected from C4-C24 alkyl and C4-C24 alkenyl, which are optionally substituted with halogen and OH.
In an embodiment of Formula A, L1 is selected from C4-C24 alkyl and C4-C24 alkenyl.
In an embodiment of Formula A, L1 is selected from C4-C24 alkenyl.
In an embodiment of Formula A, L1 is selected from C12-C24 alkenyl.
In an embodiment of Formula A, L1 is C 19 alkenyl.
In an embodiment of Formula A, L1 is:
Figure imgf000008_0001
In an embodiment of Formula A, L1 is:
Figure imgf000008_0002
In an embodiment of Formula A, L2 is selected from C3-C9 alkyl and C3-C9 alkenyl, which are optionally substituted with halogen and OH.
In an embodiment of Formula A, L2 is selected from C5-C9 alkyl and C5-C9 alkenyl, which are optionally substituted with halogen and OH. In an embodiment of Formula A, L2 is selected from C7-C9 alkyl and C7-C9 alkenyl, which are optionally substituted with halogen and OH.
In an embodiment of Formula A, L2 is selected from C3-C9 alkyl and C3-C9 alkenyl.
embodiment of Formula A, selected from C5-C9 alkyl and C5-C9 alkenyl.
In an embodiment of Formula A, selected from C7-C9 alkyl and C7-C9 alkenyl.
In an embodiment of Formula A, L2 is C3-C9 alkyl.
In an embodiment of Formula A, L2 is C5-C9 alkyl.
In an embodiment of Formula A, L2 is C7-C9 alkyl.
In an embodiment of Formula A, L2 is C9 alkyl.
In an embodiment of Formula A, "heterocyclyl" is pyrolidine, piperidine, morpholine, imidazole or piperazine.
In an embodiment of Formula A, "monocyclic heterocyclyl" is pyrolidine, piperidine, morpholine, imidazole or piperazine.
In an embodiment of Formula A, "polyamine" is putrescine, cadaverine, spermidine or spermine.
In an embodiment, "alkyl" is a straight chain saturated aliphatic hydrocarbon having the specified number of carbon atoms.
In an embodiment, "alkenyl" is a straight chain unsaturated aliphatic
hydrocarbon having the specified number of carbon atoms.
Included in the instant invention is the free form of cationic lipids of Formula A, as well as the pharmaceutically acceptable salts and stereoisomers thereof. Some of the isolated specific cationic lipids exemplified herein are the protonated salts of amine cationic lipids. The term "free form" refers to the amine cationic lipids in non-salt form. The encompassed pharmaceutically acceptable salts not only include the isolated salts exemplified for the specific cationic lipids described herein, but also all the typical pharmaceutically acceptable salts of the free form of cationic lipids of Formula A. The free form of the specific salt cationic lipids described may be isolated using techniques known in the art. For example, the free form may be regenerated by treating the salt with a suitable dilute aqueous base solution such as dilute aqueous NaOH, potassium carbonate, ammonia and sodium bicarbonate. The free forms may differ from their respective salt forms somewhat in certain physical properties, such as solubility in polar solvents, but the acid and base salts are otherwise pharmaceutically equivalent to their respective free forms for purposes of the invention.
The pharmaceutically acceptable salts of the instant cationic lipids can be synthesized from the cationic lipids of this invention which contain a basic or acidic moiety by conventional chemical methods. Generally, the salts of the basic cationic lipids are prepared either by ion exchange chromatography or by reacting the free base with stoichiometric amounts or with an excess of the desired salt-forming inorganic or organic acid in a suitable solvent or various combinations of solvents. Similarly, the salts of the acidic compounds are formed by reactions with the appropriate inorganic or organic base.
Thus, pharmaceutically acceptable salts of the cationic lipids of this invention include the conventional non-toxic salts of the cationic lipids of this invention as formed by reacting a basic instant cationic lipids with an inorganic or organic acid. For example, conventional non-toxic salts include those derived from inorganic acids such as hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric, nitric and the like, as well as salts prepared from organic acids such as acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, maleic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, sulfanilic, 2-acetoxy-benzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, isethionic, trifluoroacetic (TFA) and the like.
When the cationic lipids of the present invention are acidic, suitable
"pharmaceutically acceptable salts" refers to salts prepared form pharmaceutically acceptable non-toxic bases including inorganic bases and organic bases. Salts derived from inorganic bases include aluminum, ammonium, calcium, copper, ferric, ferrous, lithium, magnesium, manganic salts, manganous, potassium, sodium, zinc and the like. Particularly preferred are the ammonium, calcium, magnesium, potassium and sodium salts. Salts derived from
pharmaceutically acceptable organic non-toxic bases include salts of primary, secondary and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as arginine, betaine caffeine, choline, Ν,Ν1- dibenzylethylenediamine, diethylamin, 2-diethylaminoethanol, 2-dimethylaminoethanol, ethanolamine, ethylenedi amine, N-ethylmorpholine, N-ethylpiperidine, glucamine,
glucosamine, histidine, hydrabamine, isopropylamine, lysine, methylglucamine, morpholine, piperazine, piperidine, polyamine resins, procaine, purines, theobromine, triethylamine, trimethylamine tripropylamine, tromethamine and the like.
The preparation of the pharmaceutically acceptable salts described above and other typical pharmaceutically acceptable salts is more fully described by Berg et al. ,
"Pharmaceutical Salts," J. Pharm. Set, 1977:66:1-19.
It will also be noted that the cationic lipids of the present invention are potentially internal salts or zwitterions, since under physiological conditions a deprotonated acidic moiety in the compound, such as a carboxyl group, may be anionic, and this electronic charge might then be balanced off internally against the cationic charge of a protonated or alkylated basic moiety, such as a quaternary nitrogen atom.
EXAMPLES Examples provided are intended to assist in a further understanding of the invention. Particular materials employed, species and conditions are intended to be further illustrative of the invention and not limitative of the reasonable scope thereof. The reagents utilized in synthesizing the cationic lipids are either commercially available or are readily prepared by one of ordinary skill in the art.
Synthesis of the novel cationic lipids is a linear process starting from lipid acid (i). Coupling to Ν,Ο-dimethyl hydroxylamine gives the Weinreb amide ii. Grignard addition generates ketone iii. Reduction of the ketone generates alcohol iv. Esterification via EDC coupling gives esters of type v.
GENERAL SCHEME 1
Figure imgf000011_0001
(20Z.23ZVnonacosa-20,23-dien-10-yl 4-(dimethylamino)butanoate (Compound 1)
Figure imgf000011_0002
11,14-Eicosadienoic acid, (11Z,14Z)- (50 g, 162 mmol), N.O-Dimethylhydroxylamine hydrochloride (31.6 g, 324 mmol), HOAt (44.1 g, 324 mmol), Et3N (45.2 mL, 324 mmol), and EDC (62.1 g, 324 mmol) were mixed in DCM (810 mL) and stirred overnight at ambient temperature. Reaction was then washed 5 x 700 mL water, then washed 1 x 600 mL 1 M NaOH, dried with sodium sulfate, filtered through celite and evaporated to obtain 53.06 g (93%) 11,14-eicosadienamide, N-methoxy-iV-methyl-, (11Z,14Z) as a clear golden oil. !H NMR (400 MHz, CDC13) δ 5.35 (m, 4H), 3.68 (s, 3H), 3.18 (s, 3H), 2.77 (m, 2H), 2.41 (t, J= 7 Hz, 2H), 2.05 (m, 4H), 1.63 (m, 2H), 1.40-1.26 (m, 18H), 0.89 (t, J= 7 Hz, 3H).
Figure imgf000012_0003
11,14-eicosadienamide, N-methoxy-N-methyl-, (11Z.14Z)- 1 (4 g, 11.38 mmol) was dissolved in dry THF (50.0 ml) in a 250 mL flask then 1 M nonylmagnesium bromide (22.76 ml, 22.76 mmol) was added under nitrogen at ambient temperature. After 10 min, the reaction was slowly quenched with excess sat. aq NH4Cl. The reaction was washed into a separatory funnel with hexane and water, shaken, the lower aqueous layer discarded, the upper layer dried with sodium sulfate, filtered, and evaporated to give crude ketone as a golden oil. The ketone was carried directly into the next reaction crude.
Figure imgf000012_0001
Ketone (6.32 g, 15.1 mmol, 1 equiv) was dissolved in EtOH (75 mL) and NaBH4 (2.86 g, 75 mmol, 5 equiv) added. After 15 min of stirring at rt, the reaction was evaporated to a residue, taken up in hexane (200 mL) and water (200 mL), organic layer separated and dried with sodium sulfate, filtered, and evaporated to 20,23 -nonacosadien- 10-ol, (20Z,23Z)- (iv) obtained as a white solid which was used without further purification. 1H NMR (500 MHz, CDCI3) δ 5.35 (m, 4H), 3.58 (m, 1H), 2.77 (m, 2H), 2.05 (m, 4H), 1.48 -1.22 (m, 39H), 0.89 (m, 6H).
Figure imgf000012_0002
4-(dimethylamino)butyric acid hydrochloride (3.03 g, 18.05 mmol, 1.2 equiv), 20,23- nonacosadien-10-ol, (20Z,23Z)- (iv) (6.33 g, 15.04 mmol, 1 equiv), EDC (3.46 g, 18.05 mmol, 1.2 equiv), DMAP (0.368 g, 3.01 mmol, 0.2 equiv), and DIEA (7.88 mL, 45,1 mmol, 3 equiv) were combined in DCM (100 mL) and stirred at ambient temperature for 16 hours.The reaction was then washed 1 x 250 mL sat NaHCO3, and then the lower organic layer directly injected onto a 330 g silica column and purified eluting 0-15% MeOH/DCM over 30 min. Collected butanoic acid, 4-(dimethylamino)-, (1 lZ,14Z)-1-nonyl-l 1,14-eicosadien-1-yl ester (l)as a yellow oil.'H NMR (500 MHz, CDC13) δ 5.35 (m, 4H), 4.87 (m, 1H), 2.77 (m, 2H), 2.34-2.26 (m, 4H), 2.22 (s, 6H), 2.05 (m, 4H), 1.79 (m, 2H), 1.51 (m, 4H), 1.38-1.22 (m, 34H), 0.88 (m, 6H).
(18Z)-heptacos-18-en-10-vl 4-(dimethylamino)butanoate (Compound 2)
Figure imgf000013_0001
Compound 2 was prepared in a manner analogous to that described for
Compound 1 above. HRMS (M+H) calc'd 508.5088, found 508.5091.
Compound 3 is MC3 as described in WO 2010/054401, and WO 2010/144740
Al.
Figure imgf000013_0002
Compound 4 is DLinKC2DMA as described in Nature Biotechnology, 2010, 28, 172-176, WO 2010/042877 Al, WO 2010/048536 A2, WO 2010/088537 A2, and
WO 2009/127060 Al.
Figure imgf000013_0003
LNP COMPOSITIONS
The following lipid nanoparticle compositions (LNPs) of the instant invention are useful for the delivery of oligonucleotides, specifically siRNA and miRNA:
Cationic Lipid / Cholesterol / PEG-DMG 56.6/38/5.4;
Cationic Lipid / Cholesterol / PEG-DMG 60/38/2;
Cationic Lipid/ Cholesterol / PEG-DMG 67.3/29/3.7;
Cationic Lipid / Cholesterol / PEG-DMG 49.3/47/3.7;
Cationic Lipid / Cholesterol / PEG-DMG 50.3/44.3/5.4;
Cationic Lipid / Cholesterol / PEG-C-DMA / DSPC 40/48/2/10;
Cationic Lipid / Cholesterol / PEG-DMG / DSPC 40/48/2/10; and
Cationic Lipid / Cholesterol / PEG-DMG / DSPC 58/30/2/10.
LNP process description: The Lipid Nano-Particles (LNP) are prepared by an impinging jet process. The particles are formed by mixing lipids dissolved in alcohol with siRNA dissolved in a citrate buffer. The mixing ratio of lipids to siRNA are targeted at 45-55% lipid and 65-45% siRNA. The lipid solution contains a novel cationic lipid of the instant invention, a helper lipid
(cholesterol) , PEG (e.g. PEG-C-DMA, PEG-DMG) lipid, and DSPC at a concentration of 5-15 mg/mL with a target of 9-12 mg/mL in an alcohol (for example ethanol). The ratio of the lipids has a mole percent range of 25-98 for the cationic lipid with a target of 35-65, the helper lipid has a mole percent range from 0-75 with a target of 30-50, the PEG lipid has a mole percent range from 1-15 with a target of 1 -6, and the DSPC has a mole precent range of 0-15 with a target of 0-12. The siRNA solution contains one or more siRNA sequences at a concentration range from 0.3 to 1 .0 mg/mL with a target of 0.3 -0.9 mg/mL in a sodium citrate buffered salt solution with pH in the range of 3.5-5. The two liquids are heated to a temperature in the range of 15-40°C, targeting 30-40°C, and then mixed in an impinging jet mixer instantly forming the LNP. The teelD has a range from 0.25 to 1.0 mm and a total flow rate from 10 -600 mlVmin. The combination of flow rate and tubing ID has effect of controlling the particle size of the LNPs between 30 and 200 nm. The solution is then mixed with a buffered solution at a higher pH with a mixing ratio in the range of 1 : 1 to 1 :3 vol:vol but targeting 1 :2 vol: vol. This buffered solution is at a temperature in the range of 15-40°C, targeting 30-40°C. The mixed LNPs are held from 30 minutes to 2 hrs prior to an anion exchange filtration step. The temperature during incubating is in the range of 15-40°C, targeting 30-40°C. After incubating the solution is filtered through a 0.8 urn filter containing an anion exchange separation step. This process uses tubing IDs ranging from 1 mm ID to 5 mm ID and a flow rate from 10 to 2000 mL/min. The LNPs are concentrated and diafiltered via an ultrafiltration process where the alcohol is removed and the citrate buffer is exchanged for the final buffer solution such as phosphate buffered saline. The ultrafiltration process uses a tangential flow filtration fonnat (TFF). This process uses a membrane nominal molecular weight cutoff range from 30 -500 KD. The membrane format can be hollow fiber or flat sheet cassette. The TFF processes with the proper molecular weight cutoff retains the LNP in the retentate and the filtrate or permeate contains the alcohol; citrate buffer, final buffer wastes. The TFF process is a multiple step process with an initial concentration to a siRNA concentration of 1 -3 mg/mL. Following concentration, the LNPs solution is diafiltered against the final buffer for 10 -20 volumes to remove the alcohol and perform buffer exchange. The material is then concentrated an additional 1-3 fold. The final steps of the LNP process are to sterile filter the concentrated LNP solution and vial the product.
Analytical Procedure:
1) siRNA concentration The siR A duplex concentrations are determined by Strong Anion-Exchange High-Performance Liquid Chromatography (SAX-HPLC) using Waters 2695 Alliance system (Water Corporation, Milford MA) with a 2996 PDA detector. The LNPs, otherwise referred to as RNAi Delivery Vehicles (RDVs), are treated with 0.5% Triton X-100 to free total siRNA and analyzed by SAX separation using a Dionex BioLC DNAPac PA 200 (4 x 250 mm) column with UV detection at 254 nm. Mobile phase is composed of A: 25 mM NaClO4, 10 mM Tris, 20% EtOH, pH 7.0 and B: 250 mM NaClO4, 10 mM Tris, 20% EtOH, pH 7.0 with liner gradient from 0-15 min and flow rate of 1 ml/min. The siRNA amount is determined by comparing to the siRNA standard curve.
2 Encapsulation rate
Fluorescence reagent SYBR Gold is employed for RNA quantitation to monitor the encapsulation rate of RDVs. RDVs with or without Triton X-100 are used to determine the free siRNA and total siRNA amount. The assay is performed using a SpectraMax M5e microplate spectrophotometer from Molecular Devices (Sunnyvale, CA). Samples are excited at 485 nm and fluorescence emission was measured at 530 nm. The siRNA amount is determined by comparing to the siRNA standard curve.
Encapsulation rate = (1- free siRNA/total siRNA) x100% 31 Particle size and polvdispersitv
RDVs containing 1 ug siRNA are diluted to a final volume of 3 ml with 1 * PBS. The particle size and polydispersity of the samples is measured by a dynamic light scattering method using ZetaPALS instrument (Brookhaven Instruments Corporation,
Holtsville, NY). The scattered intensity is measured with He-Ne laser at 25°C with a scattering angle of 90°.
4 Zeta Potential analysis
RDVs containing 1 ug siRNA are diluted to a final volume of 2 ml with 1 mM
Tris buffer (pH 7.4). Electrophoretic mobility of samples is determined using ZetaPALS instrument (Brookhaven Instruments Corporation, Holtsville, NY) with electrode and He-Ne laser as a light source. The Smoluchowski limit is assumed in the calculation of zeta potentials. 51 Lipid analysis
Individual lipid concentrations are determined by Reverse Phase High-
Performance Liquid Chromatography (RP-HPLC) using Waters 2695 Alliance system (Water Corporation, Milford MA) with a Corona charged aerosol detector (CAD) (ESA Biosciences, Inc, Chelmsford, MA). Individual lipids in RDVs are analyzed using an Agilent Zorbax SB-C18 (50 x 4.6 mm, 1.8 μm particle size) column with CAD at 60 °C. The mobile phase is composed of A: 0.1 % TFA in H2O and B: 0.1 % TFA in EPA. The gradient changes from 60% mobile phase A and 40% mobile phase B from time 0 to 40% mobile phase A and 60% mobile phase B at 1.00 min; 40% mobile phase A and 60% mobile phase B from 1.00 to 5.00 min; 40% mobile phase A and 60% mobile phase B from 5.00 min to 25% mobile phase A and 75% mobile phase B at 10.00 min; 25% mobile phase A and 75% mobile phase B from 10.00 min to 5% mobile phase A and 95% mobile phase B at 15.00 min; and 5% mobile phase A and 95% mobile phase B from 15.00 to 60% mobile phase A and 40% mobile phase B at 20.00 min with flow rate of 1 rmVmin. The individual lipid concentration is determined by comparing to the standard curve with all the lipid components in the RDVs with a quadratic curve fit. The molar percentage of each lipid is calculated based on its molecular weight
Utilizing the above described LNP process, specific LNPs with the following ratios were identified:
Nominal composition:
Cationic Lipid / Cholesterol / PEG-DMG 60/38/2; and
Cationic Lipid / Cholesterol / PEG-DMG / DSPC 58/30/2/10.
Oligonucleotide synthesis is well known in the art (See US patent applications: US 2006/0083780, US 2006/0240554, US 2008/0020058, US 2009/0263407 and US
2009/0285881 and PCT patent applications: WO 2009/086558, WO2009/ 127060,
WO2009/132131, WO2010/042877, WO2010/054384, WO2010/054401, WO2010/054405 and WO2010/054406). The Luc and ApoB siRNA incorporated in the LNPs disclosed and utilized in the Examples were synthesized via standard solid phase procedures.
Luc siRNA
5'-iB-AUAAGGCUAUGAAGAGAUATT-iB 3' (SEQ.ID.NO.:l)
3'-UUUAUUCCGAUACUUCUCUAU-5' (SEQ.ID.NO.:2)
AUGC - Ribose
iB - Inverted deoxy abasic
UC- 2' Fluoro
AGT - 2' Deoxy
AGU - 2' OCH3
Nominal composition
Cationic Lipid /Cholesterol/PEG-DMG 60/38/2
Cationic Lipid / Cholesterol / PEG-DMG / DSPC 40/48/2/10
Cationic Lipid / Cholesterol / PEG-DMG / DSPC 58/30/2/10
ApoB siRNA
5'-iB-CUUUAACAAUUCCUGAAAUTsT-iB-3' (SEQ ID NO.:3) S'-UsUGAAAUUGUUAAGGACUsUsUsA-5' (SEQ ID NO.:4)
AUGC - Ribose
iB - Inverted deoxy abasic
UC-2' Fluoro AGT - 2' Deoxy
AGU - 2' OCH3
UsA - phophorothioate linkage EXAMPLE 1
Mouse In Vivo Evaluation of Efficacy
LNPs utilizing Compound 1, in the nominal compositions described immediately above, were evaluated for in vivo efficacy. The siRNA targets the mRNA transcript for the firefly (Photinus pyralis) luciferase gene (Accession # Ml 5077). The primary sequence and chemical modification pattern of the luciferase siRNA is displayed above. The in vivo luciferase model employs a transgenic mouse in which the firefly luciferase coding sequence is present in all cells. ROSA26- LoxP-Stop-LoxP-Luc (LSL-Luc) transgenic mice licensed from the Dana Farber Cancer Institute are induced to express the Luciferase gene by first removing the LSL sequence with a recombinant Ad-Cre virus (Vector Biolabs). Due to the organo-tropic nature of the virus, expression is limited to the liver when delivered via tail vein injection.
Luciferase expression levels in liver are quantitated by measuring light output, using an IVIS imager (Xenogen) following administration of the luciferin substrate (Caliper Life Sciences). Pre-dose luminescence levels are measured prior to administration of the RDVs. Luciferin in PBS (15mg/mL) is intraperitoneally (IP) injected in a volume of 150 uL. After a four minute incubation period mice are anesthetized with isoflurane and placed in the IVIS imager. The RDVs (containing siRNA) in PBS vehicle were tail vein injected n a volume of 0.2 mL. Final dose levels ranged from 0.1 to 0.5 mg/kg siRNA. PBS vehicle alone was dosed as a control. Mice were imaged 48 hours post dose using the method described above. Changes in luciferin light output directly correlate with luciferase mRNA levels and represent an indirect measure of luciferase siRNA activity. In vivo efficacy results are expressed as % inhibition of
luminescence relative to pre-dose luminescence levels. Systemic administration of the luciferase siRNA RDVs decreased luciferase expression in a dose dependant manner. Greater efficacy was observed in mice dosed with Compound 1 containing RDVs than with the RDV containing the octyl-CLinDMA (OCD) cationic lipid (Figure 1). OCD is known and described in
WO2010/021865.
EXAMPLE 2
Rat In Vivo Evaluation of Efficacy and Toxicity
LNPs utilizing compounds in the nominal compositions described above, were evaluated for in vivo efficacy and increases in alanine amino transferase and aspartate amino transferase in Sprague-Dawley (Crl:CD(SD) female rats (Charles River Labs). The siRNA targets the mRNA transcript for the ApoB gene (Accession # NM 019287). The primary sequence and chemical modification pattern of the ApoB siRNA is displayed above. The RDVs (containing siRNA) in PBS vehicle were tail vein injected in a volume of 1 to 1.5 mL. Infusion rate is approximately 3 ml/min. Five rats were used in each dosing group. After LNP
administration, rats are placed in cages with normal diet and water present. Six hours post dose, food is removed from the cages. Animal necropsy is performed 24 hours after LNP dosing. Rats are anesthetized under isoflurane for 5 minutes, then maintained under anesthesia by placing them in nose cones continuing the delivery of isoflurane until ex-sanguination is completed. Blood is collected from the vena cava using a 23 gauge butterfly venipuncture set and aliquoted to serum separator vacutainers for serum chemistry analysis. Punches of the excised caudate liver lobe are taken and placed in RNALater (Ambion) for mRNA analysis. Preserved liver tissue was homogenized and total RNA isolated using a Qiagen bead mill and the Qiagen miRNA-Easy RNA isolation kit following the manufacturer's instructions. Liver ApoB mRNA levels were determined by quantitative RT-PCR. Message was amplified from purified RNA utilizing a rat ApoB commercial probe set (Applied Biosysterns Cat # RN01499054_ml). The PCR reaction was performed on an ABI 7500 instrument with a 96-well Fast Block. The ApoB mRNA level is normalized to the housekeeping PPIB (NM 011149) mRNA. PPIB mRNA levels were determined by RT-PCR using a commercial probe set (Applied Biosytems Cat No. Mm00478295_ml). Results are expressed as a ratio of ApoB mRNA/ PPIB mRNA. All mRNA data is expressed relative to the PBS control dose. Serum ALT and AST analysis were performed on the Siemens Advia 1800 Clinical Chemistry Analyzer utilizing the Siemens alanine aminotransferase (Cat# 03039631) and aspartate aminotransferase (Cat# 03039631) reagents. Similar efficacy was observed in rats dosed with Compound 2 containing RDV than with the RDV containing the cationic lipid DLinKC2DMA (Compound 4) or MC3 (Compound 3, Figure 2). Additionally, 3 out of 4 rats treated with 3 mg/kg DLinKC2DMA (Compound 4) failed to survive 48 hours and 2 out of 4 rats treated with 3 mg/kg MC3 (Compound 3) failed to survive 48 hours. 3 out of 4 rats treated with 6 mg/kg Compound 2 survived at 48 hours post dose. EXAMPLE 3
Determination of Cationic Lipid Levels in Rat Liver
Liver tissue was weighed into 20-ml vials and homogenized in 9 v/w of water using a GenoGrinder 2000 (OPS Diagnostics, 1600 strokes/min, 5min). A 50 uL aliquot of each tissue homogenate was mixed with 300 uL of extraction/protein precipitating solvent (50/50 acetonitrile/methanol containing 500 nM internal standard) and the plate was centrifuged to sediment precipitated protein. A volume of 200 μL of each supernatant was then transferred to separate wells of a 96-well plate and 10 μΐ samples were directly analyzed by LC/MS-MS.
Standards were prepared by spiking known amounts of a methanol stock solution of ompound into untreated rat liver homogenate (9 vol water/weight liver). Aliquots (50 uL) each standard/liver homogenate was mixed with 300 μL of extraction/protein precipitating solvent (50/50 acetonitrile/methanol containing 500 nM internal standard) and the plate was centrifuged to sediment precipitated protein. A volume of 200 uL of each supernatant was transferred to separate wells of a 96-well plate and 10 μL of each standard was directly analyzed by LC/MS-MS.
Absolute quantification versus standards prepared and extracted from liver homogenate was performed using an Aria LX-2 HPLC system (Thermo Scientific) coupled to an API 4000 triple quadrupole mass spectrometer (Applied Biosystems). For each run, a total of 10 μΐ, sample was injected onto a BDS Hypersil C8 HPLC column (Thermo, 50 x 2mm, 3 μm) at ambient temperature.
Mobile Phase A: 95% H20/5% methanol/10 mM ammonium
formate/0.1%formic acid Mobile Phase B: 40% methanol/60% n-propanol/10 mM ammonium formate/0.1%forrnic acid The flow rate was 0.5 mL/min and gradient elution profile was as follows: hold at 80% A for 0.25 min, linear ramp to 100% B over 1.6 min, hold at 100% B for 2.5 min, then return and hold at 80% A for 1.75 min. Total run time was 5.8 min. API 4000 source parameters were CAD: 4, CUR: 15, GS1 : 65, GS2: 35, IS: 4000, TEM: 550, CXP: 15, DP: 60, EP: 10. In rats dosed with Compound 2 containing RDV liver levels were lower than with the RDV containing the cationic lipid DLinKC2DMA (Compound 4) or MC3 (Compound 3, Figure 3).

Claims

WHAT IS CLAIMED IS:
1. A cationic lipid of Formula A:
Figure imgf000020_0001
wherein: R1 and R2 are independently selected from H, ( C1-C6)alkyl, heterocyclyl, and polyamine, wherein said alkyl, heterocyclyl and polyamine are optionally substituted with one to three substituents selected from R', or R1 and R2 can be taken together with the nitrogen to which they are attached to form a monocyclic heterocycle with 4-7 members optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said monocyclic heterocycle is optionally substituted with one to three substituents selected from R'; R3 is selected from H and (C1-C6)alkyl, said alkyl optionally substituted with one to three substituents selected from R';
R' is independently selected from halogen, R", OR", SR", CN, CO2R" or CON(R")2;
R" is independently selected from H and (C1-C6)alkyl, wherein said alkyl is optionally substituted with halogen and OH; n is 0, 1, 2, 3, 4 or 5;
X is selected from O, NR", (C=O)O, NR"(C=O), O(C=O)O, NR"(C=O)NR", O(C=O)NR", and NR"(C=O)O;
L1 is selected from C4-C24 alkyl and C4-C24 alkenyl, said alkyl and alkenyl are optionally substituted with one or more substituents selected from R'; and
L2 is selected from C3-C9 alkyl and C3-C9 alkenyl, said alkyl and alkenyl are optionally substituted with one or more substituents selected from R'; or any pharmaceutically acceptable salt or stereoisomer thereof.
2. A cationic lipid of Formula A according to Claim 1 ,
wherein: R1 and R2 are each methyl; R3 is H; n is 3; X is (C=O)O;
L1 is selected from C4-C24 alkyl and C4-C24 alkenyl; and
L2 is selected from C3-C9 alkyl and C3-C9 alkenyl; or any pharmaceutically acceptable salt or stereoisomer thereof.
3. A cationic lipid which is: (20Z,23Z)-nonacosa-20,23-dien-10-yl 4-(dimethylamino)butanoate (Compound 1); and ( 18Z)-heptacos- 18-en- 10-yl 4-(dimethylamino)butanoate (Compound 2);
or any pharmaceutically acceptable salt or stereoisomer thereof.
4. The use of a cationic lipid according to Claim 1 for the preparation of lipid nanoparticles.
5. The use of a cationic lipid according to Claim 1 as a component in a lipid nanoparticle for the delivery of oligonucleotides.
6. The use according to Claim 5 wherein the oligonucleotides are siRNA or miRNA.
7. The use according to Claim 5 wherein the oligonucleotides are siRNA.
PCT/US2011/056502 2010-10-21 2011-10-17 Novel low molecular weight cationic lipids for oligonucleotide delivery WO2012054365A2 (en)

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