EP4499652A1 - Glycérophospholipides synthétiques comprenant au moins une fonction réactive, leur procédé de préparation et leurs utilisations dans différentes applications - Google Patents
Glycérophospholipides synthétiques comprenant au moins une fonction réactive, leur procédé de préparation et leurs utilisations dans différentes applicationsInfo
- Publication number
- EP4499652A1 EP4499652A1 EP23712920.0A EP23712920A EP4499652A1 EP 4499652 A1 EP4499652 A1 EP 4499652A1 EP 23712920 A EP23712920 A EP 23712920A EP 4499652 A1 EP4499652 A1 EP 4499652A1
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- European Patent Office
- Prior art keywords
- formula
- group
- glycerophospholipid
- residue
- azide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/09—Esters of phosphoric acids
- C07F9/10—Phosphatides, e.g. lecithin
- C07F9/106—Adducts, complexes, salts of phosphatides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6558—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing at least two different or differently substituted hetero rings neither condensed among themselves nor condensed with a common carbocyclic ring or ring system
- C07F9/65586—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing at least two different or differently substituted hetero rings neither condensed among themselves nor condensed with a common carbocyclic ring or ring system at least one of the hetero rings does not contain nitrogen as ring hetero atom
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/09—Esters of phosphoric acids
- C07F9/091—Esters of phosphoric acids with hydroxyalkyl compounds with further substituents on alkyl
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/09—Esters of phosphoric acids
- C07F9/117—Esters of phosphoric acids with cycloaliphatic alcohols
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6561—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing systems of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring or ring system, with or without other non-condensed hetero rings
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/531—Production of immunochemical test materials
- G01N33/532—Production of labelled immunochemicals
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/655—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having oxygen atoms, with or without sulfur, selenium, or tellurium atoms, as the only ring hetero atoms
- C07F9/65515—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having oxygen atoms, with or without sulfur, selenium, or tellurium atoms, as the only ring hetero atoms the oxygen atom being part of a five-membered ring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
Definitions
- Synthetic glycerophospholipids comprising at least one reactive function, their preparation process and their uses in different applications.
- the present invention applies to the field of glycerophospholipids (GPL) which can be used for biological studies.
- the invention relates to new GPL compounds comprising at least one reactive function which does not interfere with biological processes, to their preparation process, and to their uses in different applications.
- Glycerophospholipids (GPL) represent the most abundant class of cellular lipids. They are also the main constituents of membrane bilayers and are involved in numerous cellular processes such as mobility, energy production, and intracellular trafficking. In particular, they are directly involved in numerous intracellular signaling pathways.
- LPGs are amphiphilic lipids, that is to say they have a hydrophilic part (polar head) and a hydrophobic part (non-polar tail).
- LPGs are built around a glycerol molecule, where two hydroxyl groups are esterified with different fatty acids and the third hydroxyl group is replaced by phosphoric acid.
- the polar phosphate head in the sn-3 position giving its generic name to GPL and some of its biological properties.
- GPL phosphatidylcholine
- PC phosphatidylcholine
- Other GPLs are also naturally present such as phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylinositol (PI), phosphatidic acid (PA), and phosphatidylglycerol (PG).
- PE phosphatidylethanolamine
- PS phosphatidylserine
- PI phosphatidylinositol
- PA phosphatidic acid
- PG phosphatidylglycerol
- a cell can contain several thousand different phospholipids.
- the fluorophore is positioned at the level of the phosphate polar head via the S1-S2 connecting spacer arm.
- One of the examples has the following structure: .
- the aforementioned probes have the disadvantage of being too distant in terms of structures from the molecules whose subcellular distribution they are supposed to illustrate. Indeed, the polar heads of glycerophospholipids ensure the specificity of the interaction with certain proteins, and the nature of the fatty acid chains also plays an important role in the functions of GPL, and in interactions with proteins. Consequently, all modifications in these areas (polar head or fatty acids) clearly jeopardize the recognition of GPLs by their mobilizing proteins, potentially modifying their biological functions, and therefore bias or make impossible interpretations of the experiments carried out with these probes.
- the aim of the present invention is to overcome the drawbacks of the aforementioned prior art and to provide synthetic glycerophospholipids whose main characteristics of natural glycerophospholipids are retained while guaranteeing their use as molecular tools in the field of biology.
- Another aim of the present invention is to provide a process for preparing such synthetic glycerophospholipids that is simple, convergent, economical, and allows access to glycerophospholipids of varied structures.
- the aim of the invention is achieved by the compounds and the process which will be described below.
- the present invention thus has as its first object a synthetic glycerophospholipid corresponding to the following formula (I): in which: * the OR 1 group is chosen from a hydroxyl group, a choline residue, an ethanolamine residue, a glycerol residue, a serine residue, an inositol residue, an inositol monophosphate residue, a residue of inositol bisphosphate, a residue of inositol trisphosphate, a residue of glycerophosphate, a residue of glucose, a residue of inositolglycan, and a residue of any hydroxy compound capable of forming a phosphodiester group in the sn-3 position belonging to a subclass of natural LPG, * R 2 represents an unsaturated, mono- or polyunsaturated aliphatic chain, comprising at least 14 carbon atoms, and * R 3 represents a saturated aliphatic chain comprising at least 10 carbon atoms.
- the GPLs of formula (I) of the invention respect the nature of the lipid chains (ie a saturated fatty acid chain in the sn-1 position and an unsaturated fatty acid chain in the sn-2 position) and the polar head phosphate in the sn-3 position, which provides access to molecular tools with better reliability. Furthermore, they carry a discrete azide function of small size in the so-called “sn-0” position which does not significantly modify their properties and can serve as an attachment point for a marker or any biological probe, in particular by chemistry click. This discrete azide function thus makes it possible to provide adequate molecular tools for a detailed exploration of the localization and different roles in vitro, in vivo or in cellulo of GPL.
- this discrete azide function can then be used once the GPL of formula (I) is introduced in vitro, in cellulo or in vivo to graft different chemical tools (fluorophore, photoactivatable crosslinking agent, radiolabel, etc. ...) allowing biological studies without having to restart a specific synthesis of the glycerophospholipid skeleton.
- the term "remainder" of a hydroxyl compound means this same hydroxyl compound in which the hydrogen atom has been removed from the hydroxyl function of said hydroxyl compound to form the OR 1 group of the phosphodiester.
- the compound of formula (I) comprises two chiral centers, the first in position sn-2 whose configuration is fixed so as to correspond to that of natural LPGs, and the second in position sn-1 which has two possible configurations.
- Said compound of formula (I) can thus be chosen from a compound of formula (I)-C1, a compound of formula (I)-C2, and a mixture of compounds of formula (I)-C1 and of formula (I) -C2, said formulas (I)-C1 and (I)-C2 being as defined below: .
- the compound (I) is a compound (I)-C1.
- R 1 The OR 1 group is preferably chosen from a hydroxyl group, a choline residue, an ethanolamine residue, a glycerol residue, a serine residue, and an inositol residue.
- R 2 represents an unsaturated, mono- or polyunsaturated aliphatic chain, comprising at least 14 carbon atoms. It preferably comprises from 16 to 24 carbon atoms, and particularly preferably from 16 to 20 carbon atoms.
- the unsaturated aliphatic chain can comprise from 1 to 6 unsaturations, and preferably from 1 to 3 unsaturations. Each of the unsaturations can be of Z or E configuration.
- the unsaturated aliphatic chain is preferably an unsubstituted unsaturated aliphatic chain.
- the unsaturated aliphatic chain is preferably a linear (ie unbranched) unsaturated aliphatic chain.
- R 3 represents a saturated aliphatic chain comprising at least 10 carbon atoms. It preferably comprises from 14 to 30 carbon atoms, and particularly preferably from 14 to 24 carbon atoms.
- the saturated aliphatic chain is preferably an unsubstituted saturated aliphatic chain.
- the saturated aliphatic chain is preferably a linear (ie unbranched) saturated aliphatic chain.
- the glycerophospholipid (GPL) is chosen from the compounds of formulas (Ia) to (Ie) presented in the following table:
- the second object of the invention is a process for preparing an LPG of formula (I) as defined in the first object of the invention, characterized in that it comprises at least the following steps: i) a step of preparation of a phosphotriester of formula (IV) comprising a diacetal function implementing the functionalization of a diacetal derivative of (2S,3S)-butane-1,2,3,4-tetrol corresponding to formula (III) with a dialkyl halogenophosphate of formula (IV) in a basic medium, according to the following diagram: , in which R 4 represents a C1-C5 alkyl group or a benzyl group, and R 5 represents a C1-C5 alkyl group, ii) a step of deprotection in an acid medium of the diacetal function of the phosphotriester of formula (IV) to form a diol of formula (V) comprising a primary alcohol, according to the following diagram: , in which R 4 is as defined in the invention,
- the process of the invention allows easy access to LPGs of formula (I) according to a convergent synthesis route using a synthesis intermediate of formula (VII) common to all LPGs of formula (I). Consequently, the regio- and stereo-selective introduction of the saturated and unsaturated fatty acid chains is carried out as late as possible, ie during the two penultimate stages. This is all the more important for the introduction of the unsaturated fatty acid chain since the unsaturations can be sensitive to certain reaction conditions and/or oxidize easily.
- the paramethoxybenzyl group (PMB) makes it possible in particular to protect the alcohol function in the sn-2 position throughout the process of the invention until the introduction of the unsaturated fatty acid chain.
- Step i) is a step of preparing a phosphotriester of formula (IV) comprising a diacetal function implementing the functionalization of a diacetal derivative of (2S,3S)-butane-1,2,3 ,4-tetrol corresponding to formula (III) with a dialkyl halogenophosphate of formula (IV) in a basic medium.
- the diacetal derivative of (2S,3S)-butane-1,2,3,4-tetrol corresponding to formula (III) which is used in step i) already has the good stereochemistry on the sn-2 position to access LPG of formula (I). This stereochemistry is preserved throughout the process of the invention.
- Step i) makes it possible to introduce a protected phosphate function in the sn-3 position of the diacetal derivative (III).
- This step i) is carried out in a basic medium, for example in the presence of a base chosen from potassium tertbutanolate (tBuOK), NaH, NaNH2, and KH.
- Step i) is preferably carried out at a temperature ranging from -20°C to 50°C.
- Step i) can be carried out in a solvent such as dichloromethane, tetrahydrofuran (THF) or toluene.
- the dialkyl halogenophosphate of formula (IV) is preferably chosen from dialkyl chlorophosphates such as dimethylchlorophosphate.
- R 4 preferably represents a methyl group.
- R 5 preferably represents a methyl group.
- Step ii) is a step of deprotection in an acid medium of the diacetal function of the phosphotriester of formula (IV) to form a diol of formula (V) comprising a primary alcohol function.
- two alcohol functions are obtained including a primary alcohol function in position sn-0.
- This step ii) can be carried out in a solvent chosen from lower alcohols (ie C1-C4), such as methanol, ethanol, or isopropanol.
- Step ii) is carried out in the presence of an acid chosen from hydrochloric acid (HCl), and any other suitable acid.
- step ii) is carried out by acid methanolysis, in the presence of HCl.
- Step ii) is preferably carried out at room temperature (ie 18-25°C).
- Step iii) Step iii) is a step of selective protection of the primary alcohol function of the diol of formula (V) to form a monoalcohol of formula (VI) comprising a primary alcohol function protected by an R 6 group.
- Step iii) is preferably carried out in the presence of a compound R 6 Y, Y being a halogen atom chosen from a chlorine, bromine and iodine atom.
- Step iii) is preferably carried out in the presence of a base, and possibly a catalyst.
- the base can be chosen from diisopropylethylamine (DIPEA), triethylamine (TEA), potassium carbonate (K2CO3), sodium hydroxide (NaOH), and potash (KOH).
- the catalyst can be chosen from tin-based catalysts such as Bu2SnO.
- the R 6 group is preferably a tosyl group.
- Y is preferably a chlorine atom.
- step iii) is carried out in the presence of tosylate chloride, a base, and a tin-based catalyst.
- Step iii) can be carried out in an aprotic solvent such as toluene.
- Step iii) is preferably carried out at room temperature (ie 18-25°C).
- Step iv) is a step of nucleophilic substitution of the primary alcohol function protected by an R 6 group of the monoalcohol of formula (VI) to form an azide of formula (VII) comprising an alcohol function. This step iv) allows the introduction of the azide function thanks to the displacement of the -OR 6 group by nucleophilic substitution.
- Step iv) is preferably carried out in the presence of an azide compound chosen from sodium azide, potassium azide, tetrabutylammonium iodide, diphenylphosphoryl azide, and trimethylsilyl azide.
- Step iv) is preferably carried out at a temperature ranging from 0°C to 100°C.
- Step iv) is generally carried out in a polar solvent, preferably capable of solubilizing azide salts, such as dimethylformamide (DMF).
- This azide of formula (VII) is a key intermediate compound in the synthesis of synthetic LPGs of formula (I). Thanks to this, GPL carrying various fatty acid chains in sn-1 and sn-2 positions can be obtained in just three steps.
- the reaction crude may comprise the azide of formula (VII) mixed with the following azide of formula (VII'): , in which the phosphate triester has been partly deprotected (deprotection of an R 4 group).
- the yield of this step iv) can be improved by treatment of the reaction crude obtained at the end of step iv) with a diazomethane derivative such as trimethylsilyldiazomethane, 1-(mesitylene-2-sulfonyl)-3- nitro-1H-1,2,4-triazole, SiO2Cl, CsF/MeI, or trimethylorthoformate; and an alcohol R 4 OH, R 4 being as defined in the invention, in order to produce the azide of formula (VII).
- a diazomethane derivative such as trimethylsilyldiazomethane, 1-(mesitylene-2-sulfonyl)-3- nitro-1H-1,2,4-triazole, SiO2Cl, CsF/MeI, or trimethylorthoformate
- R 4 OH, R 4 being as defined in the invention, in order to produce the azide of formula (VII).
- Step v) is a step of esterification of the alcohol function of the azide of formula (VII) with a saturated fatty acid of formula (VIII) to form an azide of formula (IX) comprising a fatty acid chain saturated with formula and an alcohol function protected by a paramethoxybenzyl group (PMB).
- PMB paramethoxybenzyl group
- This step v) can use a coupling agent, in particular chosen from carbodiimides such as N,N'-dicyclohexylcarbodiimide (DCC), N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDCl), N -cyclohexyl-N'-isopropylcarbodiimide (CIC), or N,N'-diisopropylcarbodiimide (DIC); and optionally a catalyst such as dimethylamidopyridine (DMAP), or pyridine.
- Step v) is generally carried out in a non-nucleophilic solvent such as dichloromethane or chloroform.
- Step v) is preferably carried out at room temperature (ie 18-25°C).
- the fatty acid of formula (VIII) can be chosen from stearic acid, caproic acid, lauric acid, myristic acid, palmitic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, and melissic acid.
- Step vi) comprises a sub-step vi-1) of deprotection of the paramethoxybenzyl group of the azide of formula (IX) to form an azide of formula (X) comprising an alcohol function, followed by a sub-step -step vi-2) of esterification of the alcohol function of the azide of formula (X) with an unsaturated fatty acid of formula (XI), to form an azide of formula (XII) comprising a saturated fatty acid chain , an unsaturated fatty acid chain, and a phosphotriester function.
- Substep vi-1) can be carried out in the presence of a deprotection agent chosen from 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), ammonium nitrate and cerium (CAN), aluminum trichloride (AlCl3) in the presence of ethane thiol (EtSH), tin tetrachloride (SnCl4) in the presence of phenyl thiol (PhSH), or cerium trichloride (CeCl3) in the presence sodium iodide (NaI).
- a deprotection agent chosen from 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), ammonium nitrate and cerium (CAN), aluminum trichloride (AlCl3) in the presence of ethane thiol (EtSH), tin tetrachloride (SnCl4) in the presence of
- Substep vi-1) is preferably carried out at a temperature ranging from -20°C to 50°C.
- substep vi-1) is carried out in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, and at a temperature ranging from -20°C to 50 °C.
- the alcohol of formula (X) obtained is directly used in substep vi-2), in particular without a purification step and immediately. This helps prevent its degradation.
- Substep vi-2) can use a coupling agent, in particular chosen from carbodiimides such as N,N'-dicyclohexylcarbodiimide (DCC), N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDCl ), N-cyclohexyl-N'-isopropylcarbodiimide (CIC), or N,N'-diisopropylcarbodiimide (DIC); and optionally a catalyst such as dimethylamidopyridine (DMAP), or pyridine.
- DCC N,N'-dicyclohexylcarbodiimide
- EDCl N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide
- CIC N-cyclohexyl-N'-isopropylcarbodiimide
- DIC N,N'-diisopropylcarbodiimide
- Substep vi-2) is preferably carried out at a temperature ranging from -25°C to 0°C.
- the fatty acid of formula (XI) may be chosen from oleic acid, linoleic acid, lauroleic acid, myristoleic acid, palmitoleic acid, vaccenic acid, gadoleic acid, ketoleic acid, erucic acid, selacholeic acid, linolenic acid, eleostearic acid, arachidonic acid, cuplanodonic acid, elaidic acid, and petroselinic acid.
- sub-steps vi-1) and vi-2) make it possible to promote the deprotection of the PMB group while avoiding the reaction of the ester carried by the azide of formula (X) on itself by an intramolecular transesterification mechanism which would then induce a loss of regioselectivity in the localization of the fatty acid chains which can be followed by phosphorus NMR.
- the deprotection of the R 4 groups can be carried out in the presence of a reagent chosen from bromotrimethylsilane, butylamine, ammonia, trimethylamine, triethylamine, boron tribromide (BBr3), pyridine, l sodium iodide (NaI), and lithium cyanide (LiCN).
- Step vii) is preferably carried out in a solvent such as chloroform, DMF, or toluene.
- Step vii) is preferably carried out at room temperature (ie 18-25°C).
- the diacetal derivative of (2S,3S)-butane-1,2,3,4-tetrol corresponding to formula (III) as used in step i) can be prepared from a dialkyl-L- tartrate of formula (XIII) following: in which R 7 is a C1-C5 alkyl group, and preferably a methyl group.
- the diacetal derivative (III) can be obtained using a method similar to that described by Namysio et al., J. Prakt. Chem., 1999, 341, 6, 557-561.
- the diacetal derivative (III) is obtained according to the steps described in the following diagram:
- This method includes in particular the protection of dimethyl-L-tartrate in the form of a diacetal followed by two successive reductions of the esters and the opening of the acetal to form a triol whose two adjacent alcohol functions are then protected by a dialkylketal .
- the diacetal derivative (III) can also be obtained according to the steps described in the following diagram:
- the third object of the invention is a modified glycerophospholipid corresponding to the following formula (XIV): in which: * OR' 1 represents an OR 1 group as defined in the invention or a photoactivatable group, * R 2 and R 3 are as defined in the first subject of the invention, and * R 8 and R 9 , independently of each other, are chosen from a fluorophore group, a photocrosslinkable group, a radiolabel group , and a hydrogen atom; or the groups R 8 and R 9 together form a group chosen from a fluorophore group, a photocrosslinkable group, and a radiolabel group.
- Modified LPGs of formula (XIV) retain the structure and stereochemistry of natural LPGs.
- the fluorophore group can be chosen from fluorophores based on nitrobenzooxadiazole (NBD), fluorophores with xanthene motif, carborhodamines, cyanines, coumarins, and polycyclic aromatic hydrocarbons such as pyrenes or porphyrins.
- NBD nitrobenzooxadiazole
- fluorophores fluorophores with xanthene motif
- carborhodamines cyanines
- coumarins and polycyclic aromatic hydrocarbons
- Coumarins, nitrobenzooxadiazole (NBD) fluorophores, and carborhodamines are preferred.
- fluorophore groups which can be used according to the invention, mention may be made of the fluorophores from the Alexa Fluor range marketed by the company Molecular Probes.
- the photocrosslinkable group as R 8 and/or R 9 may comprise (or consist of) an aryl azide group, a diazirine group, a diazo group, a benzophenone group, a benzophenone derivative group, a tetrazole group, or a quinoxalinone group.
- the radiolabel group may comprise (or consist of) fluorine 18, carbon 11, iodine 123, iodine 124, or a complex of gallium 67, indium 111m, technetium 99m or thallium 201
- R 8 is a hydrogen atom and R 9 is a fluorophore group
- R 9 is a hydrogen atom and R 8 is a fluorophore group
- the groups R 8 and R 9 together form a fluorophore group.
- the photoactivatable group as OR' 1 may comprise an aromatic group containing one or more nitro -NO2 functions such as a group orthonitrobenzyl or orthonitroindoline, a coumarin group such as a coumarin-4-yl group, or a quinoline group.
- the fourth object of the invention is a process for preparing a modified glycerophospholipid of formula (XIV) as defined in the third object of the invention, characterized in that it comprises at least one step A) of preparing contact of a synthetic glycerophospholipid of formula (I) as defined in the first subject of the invention or obtained according to a process as defined in the second subject of the invention, with an alkyne corresponding to the following formula (XV) : in which R 8 and R 9 are as defined in the invention.
- Step A) can be carried out by Huisgen cycloaddition, by Huisgen cycloaddition catalyzed by copper salts (CuAAC), or by Huisgen cycloaddition using a strained alkyne (SPAAC).
- Huisgen cycloaddition using a constrained alkyne (SPAAC) is preferred. This synthesis route makes it possible to overcome the cytotoxicity of copper.
- the alkyne of formula (XV) is preferably a strained alkyne, in particular comprising a cyclooctyne group such as a difluorocyclooctyne group (DIFO), a difluorobenzocyclooctyne group (DIFBO), a dibenzocyclooctyne group (DIBO), a biarylazacyclooctynone group (BARAC ), or a bicyclo[6.1.0]nonyne (BCN) group.
- a cyclooctyne group such as a difluorocyclooctyne group (DIFO), a difluorobenzocyclooctyne group (DIFBO), a dibenzocyclooctyne group (DIBO), a biarylazacyclooctynone group (BARAC ), or a bicyclo[6.1.0]nonyn
- Step A) can be carried out before or after bringing the synthetic LPG (I) into contact with a biological medium, and preferably after bringing the synthetic LPG (I) into contact with a biological medium.
- step A) is carried out after bringing the synthetic LPG (I) into contact with a biological medium.
- the method then further comprises, before step A), a step a) of bringing the synthetic LPG (I) into contact with a biological medium, in particular in vitro, in vivo, ex vivo or in cellulo, and preferably in vitro or ex vivo. Consequently, it is possible to address the synthetic GPL (I) in a cell, then to incorporate on the glycerol skeleton according to step A) different functional groups, which will in particular depend on the envisaged application. When R' 1 is a photoactivatable group, said group can be introduced before or after step A).
- the process makes it possible to guarantee the conservation of the structure and stereochemistry of natural GPLs, of the unmodified polar head, possibly caged by a photolabile group to avoid their metabolization before the biological study, and of the fatty acid chains intact and correctly positioned.
- a single synthetic LPG (I) allows access to several types of modified LPG (XIV) and thus access to varied applications for a single synthetic LPG (I) prepared. This thus makes it possible to obtain modified GPLs (XIV) having greater structural proximity compared to natural GPLs and to have great flexibility and diversity in the choice of tools for biological studies.
- the fifth object of the invention is the use of a synthetic glycerophospholipid of formula (I) as defined in the first object of the invention or obtained according to a process as defined in the second object of the invention; or a modified glycerophospholipid (XIV) as defined in the third object of the invention or obtained according to a process as defined in the fourth object of the invention, as a molecular tool, in particular in the field of biology, or as a biological probe, especially for biological studies.
- These synthetic glycerophospholipids of formula (I) and modified glycerophospholipids of formula (XIV) cannot, for example, be used to understand the cellular processes and/or the biological functions of natural GPLs depending on the types of polar head and/or fatty acid chains.
- GPL GPL
- synthetic GPLs of formula (I) can interact, just like natural GPLs, with mobilizing proteins such as Spo20p-GFP which fluoresces in green (see example 3 of the application below), or chromogranin A (or CgA).
- modified GPLs of formula (XIV) can interact, like natural GPLs, with mobilizing proteins such as chromogranin A (or CgA).
- GPL (I) and (XIV) can be used in the form of a kit for dosing and/or localizing biomolecules, such as proteins.
- the sixth object of the invention is the use of a synthetic glycerophospholipid of formula (I) as defined in the first object of the invention or obtained according to a process as defined in the second object of the invention; or a modified glycerophospholipid of formula (XIV) as defined in the third object of the invention or obtained according to a process as defined in the fourth object of the invention, as a diagnostic tool, and preferably in as an in vitro or ex vivo diagnostic tool.
- In vitro diagnosis is carried out outside the human body in a biological medium.
- Ex vivo diagnosis is carried out outside the human body on a biological medium that has undergone prior treatment before use.
- the invention relates to a process implementing the contacting of a synthetic glycerophospholipid of formula (I) as defined in the first subject of the invention or obtained according to a process as defined in the second object of the invention; or a modified glycerophospholipid of formula (XIV) as defined in the third subject of the invention or obtained according to a process as defined in the fourth subject of the invention, with a biological medium for diagnosis, and in particular to locate and/or identify the different proteins that interact with it.
- the seventh object of the invention is a synthetic glycerophospholipid of formula (I) as defined in the first object of the invention or obtained according to a process as defined in the second object of the invention; or a modified glycerophospholipid of formula (XIV) as defined in the third object of the invention or obtained according to a process as defined in the fourth object of the invention, for its medical use.
- the invention relates to the use of a synthetic glycerophospholipid of formula (I) as defined in the first subject of the invention or obtained according to a process as defined in the second subject of the invention ; or a modified glycerophospholipid of formula (XIV) as defined in the third object of the invention or obtained according to a process as defined in the fourth object of the invention, for obtaining or preparing a medicament intended for therapeutic use (ie for obtaining or preparation of a medicine for therapeutic treatment).
- the invention also relates to a treatment method comprising the administration of a synthetic glycerophospholipid of formula (I) as defined in the first subject of the invention or obtained according to a process as defined in the second subject of the invention ; or a modified glycerophospholipid of formula (XIV) as defined in the third subject of the invention or obtained according to a process as defined in the fourth subject of the invention, in particular in therapeutic quantity, to a patient.
- a treatment method comprising the administration of a synthetic glycerophospholipid of formula (I) as defined in the first subject of the invention or obtained according to a process as defined in the second subject of the invention ; or a modified glycerophospholipid of formula (XIV) as defined in the third subject of the invention or obtained according to a process as defined in the fourth subject of the invention, in particular in therapeutic quantity, to a patient.
- GPL (I) and (XIV) comprising three successive unsaturations on the unsaturated fatty acid chain can be used to improve the secretion of neurotransmitters by neurosecretory cells and/or treat diseases of the nervous system, in particular related normal or pathological aging, or linked to mental retardation (Fragile X, Coffin Lowry Syndrome).
- Figure 1 represents confocal microscopy images of media comprising different GPLs incubated with PC12 cells expressing Spo20p-GFP.
- Figure 2 represents the percentage of colocalization of the Spo20p-GFP protein and different GPLs at the plasma membrane.
- Figure 3 represents light microscopy images of liposomes containing different GPLs.
- Figure 4 shows confocal microscopy images of liposomes containing different GPLs.
- Figure 5 shows confocal microscopy images of liposomes containing different GPLs incubated with a GgA-AF633 protein.
- the reagents are from commercial sources (Sigma-Aldrich, Acros, Alfa-Aesar) as well as the solvents (Sigma-Aldrich, Acros) and were used as received from the manufacturers without specific treatment unless otherwise indicated.
- NMR nuclear magnetic resonance
- Electrospray ionization mass spectrometry (ESI-MS) data were acquired using a spectrometer sold under the trade name LCT Premier XE by Waters Acquity. Exact mass measurements (HRMS) were carried out with a Synapt G2 HDMS system and an electrospray source equipped with a lockspray® system. The experiments were carried out with a positively charged C18 column of Waters Acquity BEH reference having the following specificities: 1.7 ⁇ m; 2.1-50mm.
- the gradient used is as follows: 98%/2% H 2 O/ACN to 100% ACN in 4 min and 1.3 min to 100% ACN with a flow rate of 0.25 ml.min ⁇ 1 . 0.5 ml are injected, and the source temperature is set at 120°C and the desolvation temperature at 300°C, with voltages of 2200 V for the detector and 3000 V for the capillary.
- the ultra-high performance liquid chromatography (UHPLC) analyzes were recorded on a device sold under the trade name Ultimate 3000 by Thermo Fisher. The experiences have been carried out on a Hypersil GOLD reference C18 column having the following specifications: 3 ⁇ m; 2.1 - 50mm.
- the gradient used is as follows: 95%/5% ACN/H2O to 100% H2O in 6 min with a flow rate of 0.6 ml.min ⁇ 1 and a pressure of 450 Bar. 10 ⁇ L are injected and an oven temperature is set at 25 °C. The products were analyzed with a UV detector at 254 nm and 270 nm. Elemental analyzes were recorded on a device sold under the trade name Flash 2000 by Thermo Fisher - EAGER 300. Determination of the general formula of an organic compound by the mass percentage of each of the elements (C, H, N, S ) present in said compound is obtained by integrating the chromatography peaks of each of the elements.
- the surfaces thus integrated are pointed on a calibration line in order to determine the concentration of each of the elements. Results are provided with an absolute accuracy of 0.4%.
- Each sample is weighed precisely in a tin basket.
- the standard used for the calibration range is 2.5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene (BBOT) with the following composition: %C: 72.53; %H: 6.09; %N: 6.51; %S: 7.44.
- Infrared spectra were produced with a spectrophotometer sold under the trade name Perkin Elmer 100 FTIR (attenuated total reflectance technique or ATR using a diamond as crystal). The products are analyzed directly on the diamond.
- Example 1 synthesis of compound Ia Preparation of the GPL precursor (S)-2-[(S)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-(4-methoxybenzyloxy)ethan-1 -ol (S)-2-[(S)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-(4-methoxybenzyloxy)ethan-1-ol was prepared according to the 5 steps illustrated in the following diagram: First step: The first step is a reaction to convert the aldehyde into a diacetal.
- Second step is a step of protection of dimethyl L-tartrate in acetal form.
- the crude mixture is cooled to room temperature and 250 ml of dichloromethane (CH2Cl2 or DCM) is added, then the reaction is stopped with excess K2CO3.
- the crude mixture is stirred for an additional hour to obtain a yellow colored mixture.
- the crude mixture is filtered and the solvents are evaporated under reduced pressure to obtain a light yellow solid which is purified by chromatography with silica gel (eluent: petroleum ether + 0.1% triethylamine (Et 3 N)/acetate ethyl (AcOEt) ). This purification step can be replaced by washing the light yellow solid with cyclohexane.
- the third step is a step of reduction of ester functions into alcohol functions. 46 g (160 mmol) of the diester as prepared in the previous step are dissolved in 750 ml of methanol under an inert atmosphere. The resulting mixture is stirred at 0°C and 18.2 g (480 mmol, 3 equiv.) of NaBH4 is added in portions.
- the fourth step is a step of opening the acetal to form a triol whose sn-1 position is released while the sn-2 position is still protected. 30 g (125 mmol) of the diol prepared in the previous step are dissolved in 750 ml of dry tetrahydrofuran (THF) under an inert atmosphere.
- the resulting mixture is cooled to 0°C and 83.1 ml (291.2 mmol, 7 equiv.) of BH3 ⁇ Me2S is added dropwise at 0°C.
- the resulting mixture is stirred for 30 min at room temperature then for 3 h at 75°C.
- the resulting mixture is cooled to 0°C and the excess borane is gently hydrolyzed with methanol.
- the mixture obtained is stirred for 30 min at room temperature and the solvents are evaporated under reduced pressure.
- the residue is treated twice again with 250 ml of methanol and evaporated under reduced pressure.
- the crude solid obtained is extracted twice with CH2Cl2 and the insoluble white solid containing the boron salts is filtered.
- the fifth step is a protection reaction of the two alcohol functions in the form of a dimethylacetal. 14 g of triol as prepared in the previous step (58.6 mmol) are dissolved in dry acetone (145 ml) under an inert atmosphere.
- the first step is a functionalization of the alcohol function in the sn-3 position of the diacetal (IIIa) to form a phosphotriester (IVa).
- the third step is a step of selective functionalization of the primary alcohol function.
- a yellow aqueous phase appears.
- a 1M HCl solution is added with vigorous stirring until the pH of the aqueous phase is approximately 1-2.
- the organic phase is separated and the aqueous phase is extracted twice with 40 ml of DCM.
- the organic phases are combined, dried over magnesium sulfate and the solvent is evaporated.
- a crude oil is obtained and purified by chromatography on silica gel (eluent: EtOAc/MeOH).
- the fourth step is a nucleophilic substitution step to replace the tosylate with the azide.
- a first quantity of dimethylated phosphate (VIIa) is obtained.
- the aqueous phase obtained during the extraction of dimethyl phosphate with chloroform includes monomethyl phosphate (VII'a). 100 ml of chloroform are added to the aqueous phase which is then cold acidified with HCl (1M) until a pH equal to 1 is reached. The monomethylated phosphate is then extracted from the aqueous phase with chloroform (5*100 ml. The organic phases are combined and dried over MgSO4 then the solvents are evaporated.
- the monomethyl phosphate is then remethylated by diluting it in methanol and using TMSCHN2 (0.6 M or 2 M in hexane) which is added until the mixture remains yellow and stirred for 30 min.
- the product obtained (VIIa) does not require purification and represents a second quantity of dimethylated phosphate (VIIa).
- the first and second quantities of product (VIIa) are combined and correspond to (2S,3S)-4-azido-3-hydroxy-2-((4-methoxybenzyl)oxy)butyl dimethyl phosphate in the form of a yellow oil clear translucent with a total yield of 53%.
- Formula: C14H22N3O7P, Molar mass 375.31 g. mol ⁇ 1 .
- the fifth step is a step of esterification of the free alcohol function in the sn-1 position with a saturated fatty acid.
- the sixth step is a step of deprotection of the paramethoxybenzyl group (PMB) followed by a step of esterification of the free alcohol function in the sn-2 position with an unsaturated fatty acid.
- PMB paramethoxybenzyl group
- the resulting mixture turns dark green.
- the aqueous phase is extracted twice with 20 ml of cold DCM, and the organic phases are combined and washed with 20 ml of a saturated NaHCO3 solution, dried over MgSO4 and the solvents are evaporated under reduced pressure.
- the alcohol obtained (Xa) is in the form of an orange-yellow oil. 162 mg (0.65 mmol, 1.5 equiv.) of oleic acid (XIa) are dissolved in 7 ml of dry DCM under an inert atmosphere at 0°C.
- phosphate diester (XIIa) as prepared in the previous step 50 mg (0.64 ⁇ mole) of phosphate diester (XIIa) as prepared in the previous step are dissolved in 3 ml of CDCl3 previously neutralized with K2CO3 and the resulting solution is stored on a molecular sieve under an inert atmosphere. Then, 21 ⁇ L (160 ⁇ mole, 2.5 equiv.) of bromotrimethylsilane (TMSBr) are added and the resulting mixture is stirred for 5 h at room temperature under a neutral atmosphere. 1 ml of water (H2O) is added and the solvents are evaporated. The crude product is purified by chromatography on silica gel (water/methanol, C18AQ column sold by Interchim).
- aqueous phosphate-buffered saline PBS
- pH 7.2 aqueous phosphate-buffered saline
- DDQ aqueous phosphate-buffered saline
- the reaction medium is diluted with 10 ml of cold DCM and 10 ml of a cold saturated NaHCO3 solution.
- the resulting mixture turns dark green.
- the aqueous phase is extracted twice with 40 ml of cold DCM, and the organic phases are combined and washed with 40 ml of cold saturated NaHCO3 solution, dried over MgSO4, and the solvents are evaporated under reduced pressure.
- the alcohol obtained is in the form of a yellow-orange oil.
- 283 mg (1.02 mmol, 2 equiv.) of linoleic acid are dissolved in 5 ml of dry DCM under an inert atmosphere at 0°C.
- 159 mg (0.78 mmol, 1.5 equiv.) of DCC and 63 mg (0.52 mmol, 1 equiv.) of DMAP are added and the resulting mixture is stirred for 5 min at room temperature under an inert atmosphere. .
- LPG (Ia) LPG (Ia)
- GPL C1 a natural LPG PA 18:1-18:0
- C1 Cellular medium without GPL is used as a control (hereinafter referred to as C1).
- Spo20p-GFP is mainly found in the nucleus and cytoplasm of cells.
- LPG (Ib) LPG (Ib)
- GPL C2 a natural LPG PA 18:2-18:0
- Avanti Polar Lipids are incubated for 5 min at a concentration of 100 ⁇ M, with PC12 cells expressing Spo20p-GFP.
- Cellular medium without GPL is used as a control (hereinafter referred to as C2).
- Figure 1 shows confocal microscopy images obtained using a device sold under the trade name SP5II by the company Leica, of the two control media C1 and C2 ( Figures 1 a and 1 d respectively), of the medium after incubation with the comparative GPL C1 (figure 1 b), of the medium after incubation with the GPL (Ia) of the invention (figure 1 c), of the medium after incubation with the comparative GPL C2 (figure 1 e), and of the medium after incubation with the GPL (Ib) of the invention ( Figure 1 f).
- the GPLs (Ia) and (Ib) of the invention cause recruitment of the Spo20p-GFP protein to the plasma membrane of PC12 cells in the same way as the corresponding natural GPLs do.
- a marker hereinafter called Membright is incubated for 5 minutes on the cells in the media as prepared above to specifically mark the plasma membrane of the cells.
- Figure 2 shows the percentage of colocalization of the Spo20p-GFP protein and different GPLs in the plasma membrane, said percentage being determined using Image J software. Therefore, thanks to the synthetic GPL(I)s of the invention , it is possible to locate and identify the different proteins that interact with them.
- Example 5 use of GPL (XIVa) as a molecular tool In this example the interaction is highlighted between GPL (XIVa) which fluoresces in the green (thanks to the fluorophore based on nitrobenzoadiazole) and a protein mobilizing phosphatidic acids (PA), the CgA-AF633 protein which fluoresces in red.
- GPL (XIVa) which fluoresces in the green
- PA protein mobilizing phosphatidic acids
- giant liposomes composed of 96% by mass of dioleoylphosphatidylcholine (DOPC) and 4% by mass of GPL (XIVa), and for comparison, giant liposomes composed of 96% by mass of dioleoylphosphatidylcholine (DOPC) and 4% by mass of a natural LPG modified with a fluorophore based on nitrobenzoadiazole: PA 18:1–6:0 NBD sold under the reference 810175C by Avanti Polar Lipids, at a concentration of 1mM, are prepared using the method of assisted swelling with polyvinyl alcohol (well known as “PVA assisted swelling method” as described in Carmon et al., FASEB J., 2020, 34:6769–6790).
- Figure 3 shows light microscopy images of liposomes containing the commercial GPL PA 18:1–6:0 NBD ( Figure 3 a) and liposomes containing the GPL (XIVa) of the invention ( Figure 3 b).
- Figure 4 shows images obtained using a confocal microscope sold under the trade name SP5 by the company Leica, of a liposome containing the commercial GPL PA 18:1–6:0 NBD (figure 4 a) and liposomes containing the GPL (XIVa) of the invention ( Figure 4 b), thus indicating that the GPL (XIVa) of the invention participates in the formation of giant liposomes.
- FIG. 5 shows images obtained using the confocal microscope of the liposomes containing the commercial GPL PA 18:1–6:0 NBD incubated with the CgA-AF633 protein ( Figures 5 a, 5 b, 5 c) and liposomes containing the GPL (XIVa) of the invention incubated with the CgA-AF633 protein ( Figures 5 d, 5 e, 5 f).
- the excitation wavelength is 463 nm and that of detection is 539 nm to allow visualization of the GPLs which fluoresce in the green; in Figures 5 b and 5 e, the excitation wavelength is 633 nm and that of detection 648 nm to allow visualization of the CgA-AF633 protein which fluoresces in the red; Figures 5 c and 5 f result from the superposition of Figures 5a and 5b then Figures 5 d and 5 e, respectively, in order to visualize both the GPL which fluoresces in the green and the CgA-AF633 protein which fluoresces in the red.
- Example 6 synthesis of a GPL fluorescent probe (XIVa') from GPL (Ia) . 50 mg (66 ⁇ mole) of compound (Ia) as prepared in Example 1 were dissolved in 330 ⁇ l of freshly distilled pyridine. 50.5 mg (330 ⁇ mole, 5 equivalents) of o-nitrobenzyl alcohol and 330 ⁇ l (3.29 mmol, 50 equivalents) of trichloroacetonitrile were added. The reaction was sealed with a Teflon septum and irradiated for 60 min at 90°C (power of 120W maximum).
- This compound comprises, in relation to compound (XIVa), a photoactivatable group OR' 1 as defined in the invention on the polar head.
- Example 7 synthesis of a GPL fluorescent probe (XIVa-2) from GPL (Ia) The carboxylic acid “ATTO 746N” (5.00 mg, 6.70 ⁇ mole) was dissolved in dichloromethane (150 ⁇ l).
- N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide (2.50 mg, 16.1 ⁇ mole) and the amine ADIBO C6 (4.70 mg, 14.7 ⁇ mole) were added and the mixture was was stirred at room temperature. during 2 hours.
- 2-(1H-Benzotriazole-1-yl)-1,1,3,3-tetramethylaminium tetrafluoroborate or TBTU (3.23 mg, 10.1 ⁇ mole) and N,N-diisopropylethylamine (DIPEA, 1 .75 ⁇ l, 10.1 umole) were added. After 1 hour, the reaction was complete. The solvent was removed under reduced pressure.
- This crude product of formula (XVa-2) was carried out in the following step without purification.
- the crude product (XVa-2) (6.33 mg, 6.7 ⁇ mole) and the GPL Ia as prepared in Example 1 (7.99 mg, 10.6 ⁇ mole) were solubilized in CHCl3. After 1 day, the solvent was removed under reduced pressure.
- the crude product is purified by chromatography on silica gel (eluent: gradient of 5% methanol up to 20% in CH2Cl2, column “Viridis Silica 5 ⁇ , 150 x 4.60 mm) to give a blue solid (XIVa- 2) (5 mg, yield of 38% after 2 steps).
- Example 8 synthesis of a GPL fluorescent probe (XIVa-3) from GPL (Ia) .
- the compound (XIIa) as prepared in Example 1 (83 mg, 106 mmol, 1 equivalent) and 7-(prop-2-yn-1-yloxy)-2H-chromen-2-one (52.8 mg, 264 ⁇ mole, 2.5 equivalents) were solubilized in tetrahydrofuran (THF) (4 ml).
- Example 9 synthesis of a GPL fluorescent probe (XIVa-4) from GPL (Ia)
- the compound of formula (XIVa-3) as prepared in Example 8 (95 mg, 99.5 ⁇ mole, 1 equivalent) was solubilized in pyridine (450 ⁇ l), then N-trityléhanolmine (151 mg, 497 ⁇ mole, 5 equivalents) and trichloroacetonitrile (450 ⁇ l) were added.
- the reaction mixture was heated to 90°C for 1 hour in microwave.
- the crude product obtained was purified by chromatography on silica gel with liquid deposition (dichloromethane) and an eluent (gradient from 100% ethyl acetate to 100% isopropanol) to obtain the intermediate compound in the form of a brown solid with a yield of 92% (114 mg).
- the reaction turned yellow when the acid was added, and was stirred for 3 hours. at room temperature.
- the reaction was monitored by UPLC (“Phenomenex Kinetex” 2.6 ⁇ PFP 100 ⁇ 150 x 4.60 mm) with a UV detector (at 254 nm) to follow the appearance of the free trityl group at 8.72 min) and a fluorescent detector (at 320 nm) to follow the transition from the intermediate compound at 12.4 min to the product (XIVa-5) at 12.2 min.
- Molar mass 999.6193 g mol ⁇ 1 .
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2202640A FR3133855B1 (fr) | 2022-03-24 | 2022-03-24 | glycérophospholipides synthétiques comprenant au moins une fonction réactive, leur procédé de préparation et leurs utilisations dans différentes applications |
| PCT/EP2023/057500 WO2023180457A1 (fr) | 2022-03-24 | 2023-03-23 | Glycérophospholipides synthétiques comprenant au moins une fonction réactive, leur procédé de préparation et leurs utilisations dans différentes applications |
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| EP4499652A1 true EP4499652A1 (fr) | 2025-02-05 |
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| US (1) | US20250215028A1 (fr) |
| EP (1) | EP4499652A1 (fr) |
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| NZ577912A (en) | 2006-09-06 | 2011-03-31 | Kode Biotech Ltd | Fluorescent cell markers |
| FR3021660B1 (fr) * | 2014-05-28 | 2018-02-16 | Laboratoire Francais Du Fractionnement Et Des Biotechnologies | Copolymeres de formule (i) et utilisations |
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- 2022-03-24 FR FR2202640A patent/FR3133855B1/fr active Active
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2023
- 2023-03-23 EP EP23712920.0A patent/EP4499652A1/fr not_active Withdrawn
- 2023-03-23 WO PCT/EP2023/057500 patent/WO2023180457A1/fr not_active Ceased
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| US20250215028A1 (en) | 2025-07-03 |
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| FR3133855A1 (fr) | 2023-09-29 |
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