Patent Application
20090253609
The present invention relates to novel hybrid structures containing at least one silicone entity -Sil- (for example polymeric: e.g. polyorganosiloxane—POS) and at least one entity B which can be of varied nature: hydrocarbon or inorganic—for example oligomeric or polymeric, in particular polyol (Po). The bond or bonds between this entity Sil and this entity B are obtained according to the chemical mechanism designated by the name “click chemistry”, in which an azide (or nitride) reactive unit reacts with a reactive unit of the alkynyl or nitrile type, to form a linking hinge (Ro) of the triazole or tetrazole type.
The invention also relates to the process for obtaining these hybrid structures as well as their applications as amphiphilic compounds, for example.
Finally, the invention also relates to the synthons, i.e. the intermediate products bearing functional groups of the azide and/or alkynyl and/or nitrile type and involved in the preparation of these hybrid structures.
The silicones of the entity Sil are in particular POS polymers. The latter constitute a class of polymers of major interest in many industrial sectors. The most common group is linear poly(dimethylsiloxane) or PDMS (MDM type POS). The second most important group of silicone materials is that of the silicone resins (MDTM or MQ type POS), formed by branched or cage form oligo or polysiloxanes. Besides the fact that the POS are a readily accessible starting material, they are also characterised by their hydrophobic properties. Silicones provide a great variety of materials. Their consistency ranges from liquid, through gel and rubber, to hard plastic. Silicones are present almost everywhere in everyday life, in the form of mastics, glues, seals, antifoam additives for washing powders, cosmetics, medical equipment, sheathing for electric cable, high performance greases, etc.
Throughout the present document, reference will be made to elements of standard nomenclature to designate the siloxy groups M, D, T, Q of the POS. As a reference work, NOLL “Chemistry and technology of silicones”, Chapter 1.1, page 1-9, Academic Press, 1968, 2nd Edition may be cited.
By extension, the Sil entity within the meaning of the invention can also contain inorganic matter based on silicon such as silica or (poly)silanes.
The entity B can in particular include polyols and more specifically, but not limitatively, oligosaccharides or polysaccharides (linear, branched or cyclic) at least in part made up of at least two, preferably at least three monosaccharide units, linked together by oside linkages.
Those specific polyol polymers which are polysaccharides are of some interest on account of their physicochemical properties (hydrophilic, hydrolysable, bioabsorbable, etc.), their chemical complexity offering multiple possibilities in terms of structure and properties, their high availability and their natural origin, inter alia. This natural origin can render them particularly attractive from an environmental and/or toxicological and/or commercial point of view. Thus, the uses of polysaccharides such as starch products and derivatives thereof or cellulose products and derivatives thereof are very numerous.
This led to the idea of creating hybrid structures based on polysaccharides and POS, so as to have available, for example, emulsifying compounds that can be used in particular in cosmetic compositions such as for example compositions for skin care, compositions for sun protection and treatment, shampoo compositions and deodorant and/or antiperspirant compositions, for example in “stick”, gel or lotion form, inter alia.
In these particular hybrid structures which are the polysaccharide-POS systems, the polysaccharide entity and the POS entity combine their respective advantages.
The polysaccharide entity, owing to the presence of its many hydroxyl groups, can enter into strong intra- or intermolecular interactions, both in a hydrophobic medium and in a hydrophilic medium. This molecular recognition type of behaviour makes it possible to obtain structures of the gel type and/or to promote interactions with polar surfaces such as textiles (i.e. cotton) or the hair.
The POS entity contributes two major advantages. The first is the flexibility which endows this POS entity with high reactivity and an ability to adapt its molecular conformation depending on the substrate or substrates present. The second advantage, among others, is due to the hydrophobic nature of this POS entity which contributes low surface energy properties.
As an example of a commercial product containing hybrid polysaccharide-POS structures, that distributed under the name “Wacker-Belsil® SPG 128 VP” may be cited. This is a cyclopentadimethylsiloxane one part of the siloxy D units whereof is substituted with a polyglucoside chain linked to the silicon by a linking hinge containing two oxygen bridges and another part of the D units whereof is substituted with an alkyl radical of the type —(CH2)w-CH3, w being a natural whole number.
It is known that the preparation of hybrid polysaccharide-POS systems can be carried out by grafting of polysaccharide entities onto a POS entity according to two main approaches: hydrosilylation or condensation.
By way of illustration of the hydrosilylation route, two prior patent references, namely EP-B-O 612 759 and WO-A-2005/087843, can for example be cited.
EP-B-O 612 759 describes organosilicon compounds containing a glycoside residue obtained by reacting an alkenylated mono or polysaccharide (1 to 10 monosaccharide units) with a POS, for example a disiloxane, bearing SiH groups. The alkenyl group is introduced directly onto the oligosaccharide or polysaccharide, unprotected, in the anomeric position, by means of alkyl oxyethanol, in the presence of a strong acid, at 100° C. The hydrosilylation is carried out by means of a Speier platinum catalyst in isopranol at 100° C. The hybrid compound obtained in the examples corresponds to the following formula:
H(C6H10O5)1.5—O—CH2CH2O—CH2—CH2—CH2—Si(CH3)2—O—Si(CH3)3
WO-A-2005/087843 describes a graft polymer containing a polyorganosiloxane skeleton and glycoside units (mono and/or polysaccharide). In particular, WO-A-2005/087843 describes the preparation of a polydimethylsiloxane grafted with a cellobiose functionalised with an allyl unit. In order to do this, the cellobiose is reacted with allylamine. After attachment of the allylamine unit to the anomeric carbon of the cellobiose, the amine group and some of the primary hydroxyls are protected by acetylation. As for the remaining hydroxyl groups, these are protected by substitution of their hydrogen with a trimethylsilyl unit. The hydrosilylation of the polydimethylsiloxane with dimethylhydrogensiloxy ends is then carried out in presence of Karstedt platinum at a temperature of 70° C. Deprotection of the POS grafted at its ends with the disaccharide cellobiose is then carried out by means of a tetrahydrofuran/methanol mixture in an acidic medium. The reaction scheme is as follows:
The protection/deprotection constraints of the saccharides are an appreciable drawback of these known polyorganosiloxane/glycoside graft polymers and the process for obtaining them.
Apart from grafting by hydrosilylation and condensation, the U.S. Pat. No. 5,428,142 which describes the grafting at C1 of an unprotected sugar, onto the terminal primary alcohol group, of polyoxyethylene grafts attached to a polysiloxane chain, by etherification in a strongly acidic medium at 100° C. can be mentioned anecdotally.
Also known is the mechanism for chemical linkage called “click chemistry” or the Huisgen reaction. Huisgen and Szeimies [(a) Huisgen, R.; Szeimies, G.; Moebius, L. Chem. Ber. 1967, 100, 2494. (b) Huisgen, R.; Knorr, R.; Moebius, L.; Szeimies, G. Chem. Ber. 1965, 98, 4014] were the first to carry out the 1,3-dipolar cycloaddition of an azido derivative to an alkyne derivative at high temperature. The reaction scheme for this cycloaddition is as follows:
The patent application WO-A-03/101972 describes the cycloaddition reaction (so-called “Huisgen” reaction), between azides and alkynes, in presence of a copper I catalyst. This reaction makes it possible to form, regiospecifically, essentially the 1,4-disubstituted 1,2,3-triazole. As shown in FIGS. 3A and 3B of WO-A-03/101972, this 1,3-dipolar cycloaddition makes it possible to obtain, for example, hybrid systems (cf. products 1 to 10) containing on the one hand phenyl nuclei and on the other hand inert or branched cyclic molecules, optionally unsaturated and optionally bearing hydroxyls, as well as a hybrid system (11) containing a triazole hinge linking on the one hand a propanediol residue and, on the other hand, a polycyclic dihydroxy compound. Furthermore, it follows from FIGS. 6 to 8 of WO-A-03/101972 that it is possible to functionalise biological amine molecules such as erythromycin (cf. FIG. 6), and also molecules containing polyazide or polyalkyl nuclei (cf. FIGS. 7 and 8).
WO-A-03/101972 does not mention hybrid compounds containing polyol entities linked by “click chemistry” cycloaddition to different polyol entities or to POS, polyalkylene glycol, polyamide, polyester, alkyl, alkenyl, alkynyl or aryl entities and combinations thereof, nor to inorganic substances such as silica.
The application WO-A-2005/118625 describes other applications of 1,3-dipolar cycloaddition “click chemistry” aiming to produce hybrid systems containing an entity A corresponding to a carbohydrate linked by a 5-membered cyclic 1,2,3-triazole hinge to an entity B consisting of an amino acid or an amino acid analogue or to an entity C representing a polypeptide or a polypeptide analogue. These hybrid systems are obtained by reacting the carbohydrate functionalised with an acetylene group or with an azide and an amino acid or a polypeptide functionalised with a corresponding amide or acetylene group. Within the meaning of WO-A-2005/118625, the term carbohydrate (cf. p. 7, 1.20 to p. 8, 1.2) designates both mono- and also polysaccharides, in which the hydroxy groups may be replaced by hydrogen, by an amine or thiol group, or by groups of heteroatoms.
The 1,3-dipolar cycloaddition is carried out by protecting the hydroxy groups of the saccharide with an acetyl group, and the amine group of the amino acid with a Boc group, and by using a copper-containing catalyst and diisopropyl-ethylamine, in a tetrahydrofuran solvent medium. The pseudo-glycoamino acids and glycopeptides obtained can be used for the treatment of bacterial diseases.
It should be noted that in the systems AB or AC according to WO-A-2005/118625, the substitution of the “carbohydrate” entity A with B or C takes place exclusively on the anomeric carbon of A. Furthermore, the 5-membered cyclic 1,2,3-triazole hinge is linked directly by a covalent bond to this anomeric carbon, with no spacer unit. Finally, the constraint of protection of the sensitive groups (OH, amine) of A, B and C which is necessary in the synthesis of the systems AB or AC according to WO-A-2005/118625 is extremely disadvantageous, in particular at the industrial level.
It must therefore be concluded that the preparation of hybrid systems by “click chemistry” or 1,3-dipolar cycloaddition of an azide derivative to an alkyne derivative in the presence of copper is limited to the combination of (poly)-saccharide polyols with amino acids or (poly)peptides.
One of the essential objectives of the present invention is to provide other hybrid compounds obtained by “click chemistry”.
Another essential objective of the invention is to provide novel hybrid compounds based on silicone entities Sil linked by at least one pentacyclic triazole or tetrazole hinge to at least one identical or different entity B (e.g. polyol), these hybrid compounds being capable of being used in many applications, both industrial (emulsifiers) and biological.
Another essential objective of the invention is to provide hybrid compounds containing one or more silicone entities Sil, linked by pentacyclic triazole or tetrazole hinges obtained par “click chemistry” to at least one entity B of polyol (polymer) type, for example polysaccharide and/or of POS, and/or polyalkylene glycol, and/or poly-amine(peptides), and/or polyester, and/or polystyrene, and/or alkyl, and/or alkenyl, and/or alkynyl, and/or aryl type, and/or inorganic type such as silica.
Another essential objective of the invention is to provide hybrid polysaccharide/POS compounds linked by at least one hinge derived from a 1,3-dipolar cycloaddition of an azide or nitrile derivative to an alkyne derivative, with copper catalysis by “click chemistry”.
Another essential objective of the invention is to provide hybrid compounds containing one or more (polymer)-polyol entities Po, for example polysaccharide, these compounds being capable of being prepared without laborious stages of protection/deprotection of the reactants, in particular of the saccharides.
Another essential objective of the invention is to provide a simple process for the preparation of hybrid compounds Sil/B without laborious stages of protection/deprotection of the reactants, in particular of the saccharides, in the case where these latter are present in B.
Another essential objective of the invention is to provide cosmetic compositions, shampoo compositions, and cleaning compositions containing hybrid compounds as defined in the above objectives.
These objectives, among others, are attained by the present invention which relates first of all to a hybrid compound Sil-Ro-B containing at least one silicone entity Sil in which at least one of the silicons of Sil is substituted with at least one group of the following general formula (I):
-Ro-B (I)
in which:
with Z representing a carbon or nitrogen atom;
Within the meaning of the invention, the term “hybrid” designates homogeneous (Sil is identical to B) or heterogeneous (Sil is different from B) Sil-Ro-B structures.
It should be noted that if Z represents a carbon atom, it is also linked to a hydrogen atom, not usually shown, so as to satisfy its valence.
According to one embodiment of the invention, the hybrid compound according to the invention is characterised in that the hinge Ro or at least one of the hinges Ro is linked to the entity Sil and/or to the entity B by a divalent linkage -L-. In other words, L is a spacer unit. Advantageously, L can for example be a hydrocarbon unit or an atom such as O or S. Within the meaning of the invention, the term “hydro(geno)carbon unit” designates a unit containing for example at least one carbon atom and/or at least one hydrogen. This includes in particular the “ester”, “amide”, “imine”, bonds . . . .
These novel hybrid compounds are easy to construct at an acceptable cost. They are therefore perfectly suitable for industrial use and they open the way to a large number of uses, in particular in the amphiphilic ingredients sector, being utilisable in particular in cosmetics or as detergents, for example: cosmetic care compositions, creams, lotions, gels, deodorant and antiperspirant compositions, soap compositions, shampoo compositions, washing compositions, etc.
The particular hybrid compounds which are POS and -Ro-polysaccharide or -Ro-alkyl combinations represent a novel group of structures which are particularly interesting in terms of compatibility with industrial requirements, in particular relating to cost and environmental impact and in terms of use.
The present invention also proposes a novel process for obtaining the aforementioned hybrid compounds. This process is characterised in that:
i. a synthon Sil-X containing at least one reactive unit X having at least one reactive end of formula (VII.1): —C≡E, with E=CH or N, is used and/or prepared;
ii. a synthon B-Y containing at least one reactive unit Y having at least one reactive end of formula (VII.2): —N3; the reactive end (VII.2) being capable of reacting with the reactive end (VII.1) is used and/or prepared;
iii. the synthon Sil-X is reacted with the synthon B-Y according to a cycloaddition mechanism, so as to obtain a hybrid compound Sil-Ro-B containing at least one entity Sil in which at least one of the silicons of Sil is substituted with at least one grouping of the following general formula (I′): -Ro-B, with Ro and B as defined above;
iv. optionally, Sil-Ro-B is separated from the reaction medium in such a manner as to recover it.
Such a process is particularly advantageous because of its simplicity, its economy, its ecocompatibiity and the multiplicity (variety) of products that it makes it possible to obtain.
It should be noted that, according to a variant, instead of or as well as the synthons Sil-X and the synthons B-Y, it is possible to use mixed synthons Sil-XY each containing at least one reactive unit X and at least one reactive unit Y and mixed synthons B-XY each containing at least one reactive unit X and at least one reactive unit Y, such that these synthons Sil-XY and B-XY are capable of reacting together or indeed with themselves.
The invention also relates to:
In the above formulae (VII.1.1), (VII.2.1), (VII.1.3) and (VII.2.4) of the synthons Sil-X, Sil-Y, B-Y and B-X, if a=0, then there is no linkage L1, L2, L3 or L4 (or spacer unit), but a direct valence bond (e.g. covalent bond).
These synthons are useful, novel and effective intermediate products for the implementation of the aforementioned process and for obtaining the hybrid compounds according to the invention.
Finally, the invention relates to the uses of these hybrid compounds and the compositions containing them.
The linking hinge Ro of formula (II.1) or (II.2) is at the heart of the hybrid compounds according to the invention.
This linking hinge is the result of a “click chemistry”, i.e. 1,3-dipolar cycloaddition, reaction on the one hand of an azide derivative the reactive end of which bears three nitrogen atoms, and on the other hand of an alkyne derivative (Z=C) or a nitrile derivative (Z=N).
This linking hinge Ro is a 5-membered, 1,4-disubstituted (cf. formula II.1) or 1,5-disubstituted (cf. formula II.2) triazole (Z=C) or tetrazole (Z=N) heterocycle.
Depending on whether the reactive functional groups of the azido type, on the one hand, and of the acetylenic or nitrile type on the other hand, are borne by the entity Sil or the entity B, this gives rise to hybrid compounds of different structures.
Thus, according to a first structure, the free valence bond of the nitrogen at the 1 position in the formulae (II.1) and (II.2) links the hinge Ro to Sil and the free valence bond of the carbon or of the atom Z at the 4 or 5 position in the formulae (II.1) and (II.2) links the hinge Ro to B.
According to a second structure, the free valence bond of the nitrogen at the 1 position in the formulae (II.1) and (II.2) links the hinge Ro to B and the free valence bond of the carbon or of the atom Z at the 4 or 5 position in the formulae (II.1) and (II.2) links the hinge Ro to Sil.
Naturally, the hybrid compounds according to the invention are not limited to compounds containing a single linking hinge Ro but also cover hybrid compounds each containing several mutually identical or different linking hinges Ro.
These structures with several mutually identical or different linking hinges Ro refer, for example, to branched multibridge structures, e.g. of the dendrimer type, in star or other shapes . . . .
In particular, in the embodiment according to which the hinge Ro or at least one of the hinges Ro is linked to the entity Sil and/or to the entity B by a divalent linkage -L-, the latter can in particular contain at least one of the linkages L1, L2, L3 and L4, as defined above in the formulae (VII.1.1), (VII.2.1), (VII.1.3) and (VII.2.4) of the synthons Sil-X, Sil-Y, B-X and B-Y. In other words, L is a spacer unit. Inter alia, the simplified general formulae of the corresponding hybrid compounds can be those belonging to the group comprising: Sil-L1-Ro-L2-Sil, Sil-L1-Ro-L4-B, Sil-L2-Ro-L3-B and B-L3-Ro-L4-B; L1, L2, L3 and L4 being spacer units, taken alone or together, being mutually identical or different.
According to a preferred embodiment of the invention, the entity Sil contains at least one POS bearing siloxy units M, D, T and/or Q, preferably at least one POS bearing siloxy units M and D, optionally T and/or Q, and, still more preferably at least one POS of the type M(D)dM, M(D)d(T)tM or MQ, with d and t rational numbers greater than or equal to 0.
d for example lies between 1 and 1,000,000, preferably from 1 to 10,000 and t for example lies between 0 and 50, preferably between 0 and 20.
In practice, these POS are for example linear polysiloxanes which are α,ω-functionalised or else functionalised within the chain. These POS can also be structures branched to a greater or lesser extent. In practice, these POS, for example, bear epoxy (e.g. glycidyl ether) and/or hydrogen and/or alkenyl (e.g. vinyl) and/or alkynyl group(s).
According to a variant, the entity Sil comprises silicone resins (MDTM or MQ type POS), formed by oligo or polysiloxanes which are branched or in cage form. The POS resins more specifically targeted are those containing siloxyl units M: (R3Si01/2), and optionally D: (R2Si02/2) and/or T: (RSiO3/2), the said resins moreover being functionalised, i.e. that they contain units M′: (YyR3-ySiO1/2) and optionally D′: (RYSiO2/2) and/or T′: (YSiO3/2), Y in these formulae representing a functional group, for example epoxy (e.g. glycidyl ether) and/or hydrogen and/or alkenyl (e.g. vinyl) and/or alkynyl, R a hydrocarbon group and y=1 or 2. These functional silicone resins MQ can be liquid or solid at ambient temperature. They have been known for a very long time and are currently used in many applications such as for example in electrically insulating varnishes, heat-resistant coatings, encapsulation materials for semi-conducting components, etc. The functional POS resins MQ (MM′Q) the preparation whereof is the subject of the present invention can also contain siloxyl units D and/or T, or indeed functionalised siloxyl units D′ and/or T′.
According to another modification, the entity Sil contains silicaceous inorganic material, such as silica.
According to another modification, the entity Sil contains (poly)silanes. The polysilanes can be linear, branched or cross-linked.
According to the invention, B is an inorganic or organic entity, optionally polymeric; and in case of the presence of a plurality of entities B per molecule of hybrid compound, the said entities B are mutually identical or different, the organic entity B then preferably being selected or preferably being derived from a compound selected from the group containing:
The synthetic polymers of the entity B can be synthetic polymers of average molecular mass greater than 1000 g/mol, preferably greater than 10000 g/mol.
In practice, B is selected or derived from a compound selected from the group comprising:
Concerning the polyol(s) that can be contained in the entity B, it/they is/are preferably selected from the saccharides in the broad sense and/or from non-saccharide polyols, for example synthetic polymeric non-saccharide polyols.
The synthetic polymeric non-saccharide polyols can in particular have an average molecular mass greater than 1000 g/mol, preferably greater than 10000 g/mol. These latter are for example polyhydroxyaldehydes H—[CHOH]n—CHO or polyhydroxyketones H—[CHOH]n—CO—[CHOH]m-H preferably containing at least 3 carbon atoms. The synthetic polymeric non-saccharide polyols preferably have at least 3, preferably at least 4, preferably at least 10, hydroxyl units. They preferably have at least 3, preferably at least 4, preferably at least 10, repeating units.
Concerning the “saccharides” (also called “carbohydrates”), it must be clearly stated that, in the context of the invention, the generic term “saccharide” includes, it will have been understood, monosaccharides, disaccharides, oligosaccharides and polysaccharides as well as all the derivatives of the saccharides.
The saccharides, their structures and formulae are known to the person skilled in the art. In particular, it is known that the saccharides have a non-reducing end and a reducing end. The latter involves the presence of an “anomeric carbon”, and is situated on the right according to the writing convention. It is also known that the saccharides have —OH groups.
According to the invention, when B contains a saccharide, the carbon of the saccharide more preferably contained in the bond(s) with the hinge(s) Ro is the “anomeric” carbon. This does not exclude the fact that all or some of the other saccharide carbons can be linked to a hinge Ro. This is all the more possible when the groups borne by the “non-anomeric” carbons do not require protection during the synthesis of the hybrid compound. The monosaccharides are molecules containing a single saccharide unit (for example C5: pentose or C6: hexose), with no glycosidic connection between several units of this type. The monosaccharides include inter alia the aldoses, dialdoses, aldoketoses, ketoses and diketoses, as well as the deoxysaccharides, aminosaccharides and derivatives thereof resulting from precursors at least potentially containing a carbonyl group.
As examples of monosaccharides, the following saccharides are cited:
D-glucose, fructose, sorbose, mannose, galactose, talose, allose, gulose, idose, glucosamine, mannosamine, galactosamine, glucuronic acid, rhamnose, arabinose, galacturonic acid, fucose, xylose, lyxose and ribose.
As examples of di- or oligo-saccharides, the following saccharides are cited:
The polysaccharides according to the invention can be linear or branched and can for example contain more than 20 monosaccharide residues or preferably more than 30 monosaccharide residues or still more particularly between 25 and 100 monosaccharide residues. These latter can be mutually identical or different.
The polysaccharides according to the invention can contain linear mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona- or decasaccharide, preferably mono-, di-, tri- or tetra-saccharide, units. The polysaccharides can contain at least two, or at least three or at least four, or at least ten, or markedly more in the case of polysaccharide polymers, of these linear units.
In certain variants, the polysaccharides according to the invention can contain recurring saccharide units of the N-acetyl-lactosamine type or acetylated saccharide units.
Also mentioned as examples of polysaccharides are:
According to a particular implementation mode, the entity B is different from a maltodextrin. According to a particular embodiment the entity B is different from a cyclodextrin.
The starchy or cellulosic polysaccharides capable of entering into the constitution of the entity B are preferably of natural origin, but could also be obtained by a synthetic route. As saccharide derivatives, the following can in particular be mentioned:
Derivatisation can be used to chemically modify derivatives of saccharides other than those mentioned above.
According to a particular implementation mode, polyols capable of entering into the constitution of the entity B are selected:
One of the major advantages of the invention is that of proposing hybrid compounds whose synthesis does not necessitate protection of sensitive groups, in particular those borne by the saccharides of the entity Sil or B.
Naturally, such protection is nonetheless possible, for example to improve the solubility.
The entity B can also include residues of the polyalkylene glycol type optionally having at least one alkyl ether, for example methyl ether, terminus.
As examples of polyalkylene glycols, polyoxyethylene glycols, polyoxyethylene glycol monoalkyl (e.g. methyl)ethers, polyoxypropylene glycols, polyoxy-propylene glycol monoalkyl (e.g. methyl)ethers, polyoxytetraethylene glycols, etc. can be mentioned.
Polyamides can be constituent elements of the entity B. As examples of polyamides, polyamides 6-6, polyamides 6, polyamides 6 monoamine, polyamines 6-10, polyamides 12-12, etc. can be mentioned.
Polyesters can be constituent elements of the entity B. As examples of polyesters, poly-ε-caprolactone, polylactic acid, polyethylene glycol adipate, polyhydroxyalkanoate, etc., can be mentioned.
Polystyrenes can be constituent elements of the entity B. As examples of polystyrenes, hydroxytelechelic or monofunctional polystyrene, etc. can be mentioned.
Polybutadienes can be constituent elements of the entity B. As examples of polybutadienes, hydroxytelechelic polybutadiene, etc. can be mentioned.
Amino acids and peptides can be constituent elements of the entity B. Within the meaning of the invention, the term “peptides” designates, inter alia, oligopeptides and polypeptides, or even proteins. Derivatives (or analogues) of amino acids (natural or synthetic) and of peptides are also targeted by the invention as the entity B.
All the (co)polymers capable of entering into the constitution of the entity B of the hybrid compound Sil-Ro-B can be linear or branched or cross-linked homopolymers, or else linear or branched, optionally cross-linked, block or random copolymers.
When B is a (co)polymer, it can be envisaged that the synthon B-X or B-Y used to prepare the hybrid compound, may contain a finished (co)polymer or an unfinished monomer, oligomer or polymer unit, destined to grow to form a finished polymer after reaction with Sil-Y or Sil-X.
The alkyl, alkenyl or alkynyl chains capable of being included in the entity B for example contain from 2 to 50 carbon atoms, preferably from 4 to 40, and more preferably from 4 to 30 carbon atoms. As examples, butyl, octyl, dodecyl, octadecyl, eicosene, etc. can be mentioned.
Silica is an example of an inorganic material capable of entering into the constitution of the entity B.
According to an advantageous implementation mode, the entity B contains polymers or copolymers selected from the group as mentioned above, or indeed also linear or branched, optionally cross-linked, chains. For example, the molar mass of this entity B is greater than or equal to 100, preferably greater than or equal to 100, and still more preferably lies between 100 and 50000.
According to a particular implementation sub-embodiment of the invention, the hybrid compound Sil-Ro-B corresponds to at least one of the following formulae:
in which:
Preferably,
The Process
According to another of its aspects, the invention relates to a process for obtaining hybrid compounds and in particular those according to the invention, such as described above.
This preparation process is that defined above. It comprises the four stages (i), (ii), (iii), (iv), which are described in detail below for non-limiting illustration.
Stages (i) and (ii): The Synthons Used
More precisely in the case of starting synthons Sil-X,
1. according to a 1st possibility, Sil can contain at least one residue functionalised with at least one functionalising group belonging to the group comprising the carboxylic, carboxylate, anhydride, thiol, isocyanate and epoxide functionalising groups with:
2. according to a 2nd possibility, Sil contains at least one residue (for example POS) functionalised with at least one functionalising group belonging to the group comprising hydrogen and units bearing at least one ethylenic unsaturation, with L1 containing at least one group (for example terminal) bearing at least one ethylenic unsaturation and/or at least one hydrogen, having reacted with the corresponding functionalising group or groups of Sil;
3. according to a 3rd possibility, the first two possibilities are combined.
Advantageously, this synthon Sil-X can be characterised in that Sil is a polymer comprising, for example, at least two, preferably at least 3, and, still more preferably at least 10 monomer (siloxy) units.
The preparation of the synthon Sil-X can advantageously include the following essential sub-stages:
According to one preferred characteristic, L1 corresponds to:
with a first precursor corresponding to:
and with a second precursor corresponding to:
and still more preferably to propargylamine:
According to one modification, the preparation of Sil-X can be carried out as described in Polymer 44 (2003) 6449-6455 Telechelic polydimethylsiloxane with terminal acetylenic groups prepared by phase transfer catalysis.
More precisely in the case of starting synthons B-X:
1. according to a 1st possibility, B comprises at least one saccharide with:
2. according to a 2nd possibility, B contains at least one residue (for example saccharide) functionalised with at least one functionalising group belonging to the group comprising the carboxylic, carboxylate, anhydride, thiol, isocyanate and epoxide functionalising groups, with:
3. according to a 3rd possibility, B contains at least one residue (for example POS) functionalised with at least one functionalising group belonging to the group comprising hydrogen and units bearing at least one ethylenic unsaturation, with L3 containing at least one group (for example terminal) bearing at least one ethylenic unsaturation and/or at least one hydrogen, having reacted with the corresponding functionalising group or groups of B;
4. according to a 4th possibility, the first three possibilities are combined.
Advantageously, if B contains a polyol, this synthon B-X can be characterised in that this polyol is a polymer comprising, for example, at least two, preferably at least 3, and, still more preferably at least 10 monomer units.
The preparation of the synthon B-X can advantageously include the following essential sub-stages:
According to one preferred characteristic, L3 corresponds to —NH—(CH2)q≧1, with a precursor corresponding to:
and still more preferably to propargylamine:
According to the variants of this preferred characteristic, the precursor of the linkage L3 could in particular be: acrylonitrile, propargyl alcohol or monopropargyl triethylene glycol. In the case where B comprises a POS, the preparation of B-X can be carried out as described in Polymer 44 (2003) 6449-6455 Telechelic polydimethylsiloxane with terminal acetylenic groups prepared by phase transfer catalysis.
More precisely in the case of starting synthons Sil-Y:
1. according to a 1st possibility, Sil can contain at least one residue functionalised with at least one functionalising group belonging to the group comprising the carboxylic, carboxylate, anhydride, thiol, isocyanate and epoxide functionalising groups with:
2. according to a 2nd possibility, Sil contains at least one residue (for example POS) functionalised with at least one functionalising group belonging to the group comprising hydrogen and units bearing at least one ethylenic unsaturation, with L2 containing at least one group (for example terminal) bearing at least one ethylenic unsaturation and/or at least one hydrogen, having reacted with the corresponding functionalising group or groups of Sil;
3. according to a 3rd possibility, the first two possibilities are combined.
Advantageously, this synthon Sil-Y can be characterised in that Po is a polymer comprising, for example, at least two, preferably at least 3, and, still more preferably at least 10 monomer units.
The preparation of the synthon Sil-Y can advantageously include the following essential sub-stages:
According to a preferred characteristic, L2 corresponds to:
with a first precursor corresponding to:
and with a second precursor corresponding to an amine suitable for reacting with the epoxy of the first precursor and bearing the group N3.
For example, the precursor of the linkage L2 could in particular be:
H2N(CH2CH2O)3(CH2)N3, H2NCH(COOH)(CH2)2N3 or HO(CH2)6N3. For more details, reference should be made to JACS 2005, 127, p 14942-14949 and JACS 2004, 126, 10598-10602.
More precisely in the case of starting synthons B-Y:
1. according to a 1st possibility, B comprises at least one saccharide with:
2. according to a 2nd possibility, B contains at least one residue (for example POS) functionalised with at least one functionalising group belonging to the group comprising the carboxylic, carboxylate, anhydride, thiol, isocyanate and epoxide functionalising groups, with:
3. according to a 3rd possibility, B contains at least one residue (for example POS) functionalised with at least one functionalising group belonging to the group comprising hydrogen and units bearing at least one ethylenic unsaturation, with L4 containing at least one group (for example terminal) bearing at least one ethylenic unsaturation having reacted with the functionalising group or groups of B;
4. according to a 4th possibility, the first three possibilities are combined.
Advantageously, if B comprises a polyol, this synthon B-Y can be characterised in that B is a polymer comprising, for example, at least two, preferably at least 3, and, still more preferably at least 10 monomer units.
The preparation of the synthon B-Y can advantageously include the following essential sub-stages:
According to one preferred characteristic, B-Y is obtained from an entity B bearing functionalising groups of the epoxide type which are reacted with the precursor NaN3.
Within the scope of this preferred characteristic, the precursor of the linkage L4 could for example in particular be: acrylonitrile, propargyl alcohol or monopropargyl triethylene glycol.
In the case where B comprises a POS, the preparation of B-X can be carried out as described in Polymer 44 (2003) 6449-6455 Telechelic polydimethylsiloxane with terminal acetylenic groups prepared by phase transfer catalysis.
More precisely in the case of starting synthons Sil-XY and B-XY, reference will be made to the descriptions of structures and preparation given above for Sil-X, Sil-Y, B-X and B-Y.
Stage (iii): Cycloaddition
The cycloaddition mechanism [stage (iii)] at the heart of the process according to the invention is a mechanism of 1,3-dipolar cycloaddition of a synthon Sil-X or B-Y with azido reactive units VII.2 and of a synthon B-Y or Sil-X with acetylenic or nitrile reactive units VII.1 (“click chemistry”) under copper I catalysis, preferably in an aqueous, aqueous organic or organic medium.
This mechanism is particularly attractive on account of its simplicity, its non-hazardous nature for the operators and the environment, and its low cost, inter alia.
It should be noted that, according to a variant, instead of or as well as the synthons Sil-X and the synthons B-Y, it is possible to use mixed synthons Sil-XY each containing at least one reactive unit X and at least one reactive unit Y and mixed synthons B-XY each containing at least one reactive unit X and at least one reactive unit Y, such that these synthons Sil-XY and B-XY are capable of reacting together.
Within the meaning of the invention as defined in the present document, the expression “of the order” signifies that the values concerned are given with an uncertainty of for example plus or minus 10%.
More precisely still, it is advisable that the cycloaddition stage (iii) be carried out in an aqueous, aqueous alcoholic or organic medium capable of solubilising and/or swelling the synthon Sil-X and/or the synthon B-Y, by means of at least one metallic catalyst in ionised form, preferably Cu++, in the presence of at least one reducing agent of Cu++ to Cu+, in situ, this reducing agent preferably being selected from the group comprising: ascorbate, quinone, hydroquinone, vitamin K1, glutathione, cysteine, Fe2+, Co2+, applied electric potential, metal of the group comprising Cu, Al, Be, Co, Cr, Fe, Mg, Mn, Ni, and Zn, and mixtures thereof.
In practice, the metallic catalyst in ionised form, preferably Cu++, Cu advantageously takes the form of salt(s) (ideally sulphate), still more preferably containing at least one activator comprising for example at least one salt of organic acid(s) (ideally ascorbic acid) and at least one alkali metal (ideally Na). Thus, the system CuSO4/sodium ascorbate is for example entirely suitable.
Moreover, the cycloaddition stage (iii) is preferably implemented in a reaction medium whose temperature lies between 20 and 100° C., preferably between 50 and 80° C., for 0.1 to 20 hours, preferably for 0.5 hour to 15 hours, and still more preferably for 1 to 8 hours. The heating of the reaction medium is carried out by any appropriate means. Microwave irradiation can for example constitute an advantageous means of heating.
Advantageously, the reaction medium of the cycloaddition stage (iii) is an aqueous, aqueous organic or organic medium preferably containing at least one solvent selected from:
Stage (iv): Separation
This being the possible separation stage (iv) of the hybrid compound Sil-Ro-B from the reaction medium, it can in particular consist of carrying out:
According to another of these aspects, the present invention relates to the synthons Sil-X, Sil-Y, B-X, B-Y, Sil-XY and B-XY according to the invention, taken as such and as defined above in the context of the description of the process according to the invention.
The present invention also relates to the use of a hybrid compound as described above as such or as a product obtained by the process itself also defined above, as an ingredient in compositions selected from the group containing:
The above compositions also constitute another subject of the invention.
In particular, these compositions can be an emulsion, preferably an oil-in-water emulsion containing a hybrid compound according to the invention.
The hybrid compounds according to the invention can in particular be presented in the form of oils. They can also be presented in dispersed or solubilised form in a vector, for example at a concentration of 10 to 90% by weight. The vector can advantageously be a solvent of the polymer, for example a silicone compound, optionally volatile, for example a linear or cyclic polydimethylorganosiloxane such as cyclopentasiloxane, disiloxane, linear dimethicones, or a trimethylsiloxyphenyl dimethicone, or a mixture.
The hybrid compounds according to the invention can in particular be used as an emulsifying or co-emulsifying agent for preparing or stabilising emulsions. They can for example be used in emulsions one phase of which is a silicone oil. Presented in the form of solutions in a polyorganosiloxane, for example in cyclopentasiloxane, they can be used as an emulsifier for water-in-oil or oil-in-silicone emulsions. They can also be used to compatibilise several compounds within a formulation. They can also be used an auxiliary agent for the deposition of another compound, or as a trigger of the deposition of another compound. They can also be used as dispersant or co-dispersant agents for preparing or stabilising dispersions of particles, for example of pigments.
They can in particular be used or contained in a cosmetic formulation, whether or not intended to be rinsed, for the care of the skin and/or of the hair and/or of the lips, for example in skin care creams or milks or oils, sun protection creams or milks or oils, shampoos, conditioners, shower gels, make-up compositions, lipsticks, or deodorants. In particular, the hybrid compounds according to the invention have the advantages in these applications of being of low irritancy, partially biodegradable or bioabsorbable, of producing a pleasant feel, and/or of producing an advantageous spreading behaviour.
The hybrid compounds can impart to the compositions into which they are introduced, in the presence of surfactants, foaming properties valued by the consumer, in particular compact-ness and/or a gloss valued by the consumer, with the foam having good stability over time.
Other details of the invention will appear more clearly in the light of the examples given below by way of illustration.
The hybrid compounds exemplified below are oligoorganosiloxanes or polyorganosiloxanes, more precisely polydimethylsiloxanes (PDMS) with trimethylsilyl ends (MD10M) modified with oligosaccharide groups (cf. structures A, B, C) according to a “click chemistry” mechanism.
Structure No. A: PDMS type [MD10modified cellobioseM]
Structure No. B: PDMS type [MD10modified oligoxyloglucanM]
Structure No. C: PDMS type [Mmodified oligoxyloglucanD10Mmodified oligoxyloglucan]
Experimental Section
This section describes the experimental stages which made it possible to obtain the structures A, B and C described. These stages comprise:
Preparation of Synthons
Stage (i): Synthesis of Terminal Alkyne Derivatives of the Sugars (Synthons B-X):
Structure A
15 g of cellobiose 1 (43.8 mmol) and 62.3 ml of propargylamine (908 mmol, 21 equivs.) are placed in a 250 ml flask.
The reaction medium is continuously stirred magnetically for 40 hours at ambient temperature. Initially, the solution is heterogeneous and at the end of 16 hours becomes homogeneous. The progress of the reaction is monitored by thin layer chromatography (CH3CN/H2O-7:3 v/v).
The reaction medium is evaporated to dryness and co-evaporated with a mixture of MeOH and toluene (1:1 v/v) to give a yellow solid.
The solid is selectively N-acetylated by addition of 300 mL of a solution of MeOH and Ac2O (5:1 v/v). The solution is continuously stirred magnetically for one night at ambient temperature. The solution became completely homogeneous. After evaporation to dryness and co-evaporation with the MeOH/toluene mixture (1:1 v/v), then lyophilisation, the compound 2 is obtained as a white solid (15.2 g, 36.1 mmol, 83%).
Mass Spectrometry (ESI): m/z=444.07 [M+Na]+
1H NMR (400 MHz, D2O, 298K)
δ (ppm)=2.28 (s, 0.8H, rotamer, CH3 (Ac)); 2.22 (s, 2.2H, rotamer, CH3 (Ac)); 3.14-4.18 (m, 14H, H-2, 3, 4, 5, 6a, 6bGlcI and GlcII and NCH2)); 4.41 (d, 1H, J1-2=7.91 Hz, H-1GlcII(β)); 5.04 (d, 1H, rotamer, J1-2=8.68 Hz, H-1GlcI(β)); 5.50 (d, 1H, rotamer, J1-2=8.86 Hz, H-1GlcI(β)).
13C NMR (100 MHz, D2O, 298K)
δ (ppm)=18.8, 19.3 (rotamers, CH3 (Ac)); 27.8, 30.5 (rotamers, NCH2); 57.6, 58.3 (C-6GlcI and GlcII); 67.2-79.4 (C-2, 3, 4, 5GlcI and GlcII); 84.1 (C-1GlcI); 100.2 (C-1GlcII); 172.3, 173.5 (rotamers, C═O (Ac)).
IR (KBr): 3391 (O—H), 1645 cm−1 (C═O).
Structures B, C
2 g of the mixture 3, 4 and 5 (1.58 mmol) (respective ratio of 0.15/0.35/0.50), 2 mL of propargylamine (31.2 mmol, 19.7 equivs.) and 3 mL of MeOH are placed in a 25 mL flask. The reaction medium is continuously stirred magnetically for 3 days at ambient temperature. The solution is quite viscous and orange in colour. The progress of the reaction is monitored by thin layer chromatography (CH3CN/H2O-7:3 v/v).
The solution is then diluted with 60 mL of a mixture of MeOH and CH2Cl2 in the proportion 1:2 v/v. A white precipitate appears spontaneously and the solution is kept stirred for 10 mins. The solution is filtered and the white solid is washed with 60 mL of the 1:2 v/v mixture of MeOH/CH2Cl2.
The solid is then subjected to N-acetylation by placing it in 400 mL of a solution of MeOH and Ac2O in the proportion 20:1 v/v. The reaction medium is continuously stirred magnetically for 1 day at ambient temperature and the solution remains slightly turbid. The migration on TLC(CH3CN/H2O-7:3 v/v) shows no significant difference compared to the non-N-acetylated products.
The compounds 6, 7 and 8 are concentrated and lyophilised and take the form of a fluffy white powder (2 g, 1.48 mmol, 94%).
Mass Spectrometry (MALDI-TOF): 6 m/z=1163.87 [M+Na]+
1H NMR (400 MHz, D2O, 298K)
δ (ppm)=2.17, 2.23 (s, CH3 (Ac)); 3.20-4.50 (m, H-2, 3, 4, 5, 6Glc, Gal and Xyl); 4.60-4.90 (d and m, H-1Glc and Gal); 5.18, 5.02 (d, H-1Xyl); 5.44 (d, J1-2=8.61, H-1Glc 1β).
IR (KBr): 3402 (O—H), 1645 cm−1 (C═O).
Stage (ii): Synthesis of the Terminal Azido Derivatives:
Structures A, B
The trisiloxane 9 (12 g, 35.7 mmol) is diluted in 60 mL of isopropyl alcohol (IPA) then 5 equiv. of sodium azide (11.5 g, 178.5 mmol), 40 mL of distilled water and 20 mL of glacial acetic acid are added to attain a pH of about 6.
The reaction medium is stirred at 50° C. for 4 hrs. The reaction is monitored by TLC (9:1 v/v toluene/EtOAc).
The reaction medium is diluted with diethyl ether (200 mL) and extracted successively with a sat. solution of NaHCO3 (2×100 mL) and water (100 mL). The organic phase is recovered, dried over Na2SO4, and filtered then evaporated to dryness to give the compound 10 (13.5 g, quantitative yield) in the form of a pale yellow oil which is sufficiently pure to be used for the next reaction.
Mass Spectrometry (ESI): m/z=380 [M+H]+
1H NMR (300 MHz, CDCl3, 298K)
δ (ppm)=−0.01 (s, 3H, SiCH3); 0.06 (m, 18H, 2×Si(CH3)3); 0.42 (m, 2H, SiCH2(α)); 1.57 (m, 2H, SiCH2CH2(β)); 2.57 (bs, 1H, OH); 3.40 (m, 6H, CH2OCH2 and CH2N3); 3.90 (m, 1H, CHOH).
13C NMR (75 MHz, CDCl3, 298K)
δ (ppm)=−0.2 (SiCH3); 2.0 (Si(CH3)3); 13.7 (SiCH2(α)); 23.4 (SiCH2CH2(β)); 53.8 (CH2N3); 69.9 (CHOH); 71.9, 74.4 (CH2OCH2).
IR (KBr): 3432 (O—H), 2957 and 2871 (C—H), 2102 (N3), 1258 (C—O), 1076 and 1053 cm−1 (Si—o).
Structure C
The polyorganosiloxane 11 of average DP equal to 10 (2 g, ca. 1.81 mmol) is diluted in 13 mL of isopropyl alcohol (IPA) then 5 equivs. of sodium azide (1.93 g, 9.07 mmol), 3.9 mL of distilled water and 3.3 mL of glacial acetic acid are added to reach a pH of about 6.
The reaction medium is stirred at 50° C. for 7 hrs. The reaction is followed by 1H NMR and stopped when the starting material has been practically totally consumed.
The reaction medium is diluted with diethyl ether (30 mL) and extracted with water (10 mL). The organic phase is recovered, dried over Na2SO4 and filtered then evaporated to dryness to give the compound 12 (1.95 g, 89%) in the form of a colourless oil sufficiently pure to be used for the next reaction.
1H NMR (300 MHz, CDCl3, 298K)
δ (ppm)=0.05 (m, 72H, 12×Si(CH3)2); 0.51 (m, 4H, 2×SiCH2(α)); 1.58 (m, 4H, 2×SiCH2CH2(β)); 3.33-3.43 (m, 12H, 2×CH2OCH2 and CH2N3); 3.91 (m, 2H, 2×CHOH).
13C NMR (75 MHz, CDCl3, 298K)
δ (ppm)=−0.3, 1.2, 1.4 (Si(CH3)2); 14.3 (SiCH2(α)); 23.5 (SiCH2CH2(β)); 53.7 (CH2N3); 69.9 (CHOH); 71.9, 74.5 (CH2OCH2).
IR (KBr): 3415 (O—H), 2962 and 2874 (C—H), 2104 (N3), 1261 (C—O), 1034 and 1070 cm−1 (Si—O).
Stages (iii) & (iv): Condensation Compounds by “Click Chemistry”
Sodium ascorbate (0.1 equivs., 4.7 mg, 24 μmol) and copper sulphate freshly dissolved in solution at 0.1M (0.01 equivs., 24 μL, 2.4 μmol) are added to a solution of the cellobiose derivative containing the terminal alkyne 2 (100 mg, 237 μmol) and the azido trisiloxane derivative 10 (1.1 equivs., 99 mg, 261 μmol) in 0.6 mL of water and 1 mL of iPrOH.
The solution is brought up to 50° C. in a sealed tube and agitated for 1 hour. The reaction is monitored by TLC(CH3CN/H2O-7:3 v/v).
The medium is next diluted in MeOH (5 mL) then evaporated to dryness in the presence of silica.
The residue is placed on a column of silica gel. After purification by rapid chromatography on silica gel (acetonitrile/water: 9-1 v/v), the compound 15 is obtained in a yield of 89% (168 mg, 210 μmol) and in the form of a white powder after lyophilisation.
Mass Spectrometry (ESI): m/z=823.46 [M+Na]+
1H NMR (400 MHz, CD3OD, 298K)
δ (ppm)=0.04 (s, 3H, SiCH3); 0.10 (m, 18H, 6×Si (CH3)3; 0.49 (m, 2H, SiCH2(α)); 1.61 (m, 2H, SiCH2CH2 (β)); 2.08, 2.22 (2×s, 3H, rotamers, CH3 (Ac)); 3.25-3.89 (m, 15H, H-2, 3, 4, 5, 6a, 6bGlcI and GlcII and CH2OCH2); 4.09 (m, 1H, CHOH); 4.40 (m, 1H, CH(OH)CH2N); 4.44 (d, 1H, J1-2=7.88 Hz, H-1GlcI(β)); 4.56 (m, 1H, CH(OH)CH2N); 4.62 (m, 2H, rotamers, CH2N(Ac)); 5.00 (d, 0.18H, rotamer, J1-2=8.21 Hz, H-1GlcI(β)); 5.66 (d, 0.82H, rotamer, J1-2=9.20 Hz, H-1GlcI(β)); 7.86, 8.02 (s, 1H, H-5triazole).
13C NMR (100 MHz, CD3OD, 298K)
δ (ppm)=0.0 (SiCH3); 2.1 (Si(CH3)3); 14.7 (SiCH2(α)); 22.1 (CH3 (Ac)); 24.6 (SiCH2CH2(β)); 37.5 (CH2N(Ac)); 54.7 (CH(OH)CH2SiN); 61.9, 62.6 (C-6GlcI and GlcII); 70.5, 71.5, 72.1, 73.3, 73.4, 75.0, 75.4, 76.6, 78.0, 78.3, 78.9, 80.0 (C2, 3, 4, 5GlcI and GlcII, CH2OCH2, CHOH); 88.9 (C-1GlcI); 104.7 (C-1GlcII); 126.1 (C-5triazole), 146.4 (C-1triazole), 174.5 (C═O (NAc)).
Sodium ascorbate (1 equiv., 1.6 g, 8.1 mmol) and copper sulphate freshly dissolved in 1M solution (0.5 equiv., 4.04 mL, 4.04 mmol) are added to a solution of the oligoxyloglucan derivatives containing the terminal alkyne 6(DP7), 7(DP8) and 8(DP9) (10.9 g, 8.1 mmol) and the azido trisiloxane derivative 10 (1.5 equiv., 8.4 g, 12.1 mmol) in 120 mL of water and 180 mL of iPrOH.
The solution is brought up to 50° C. in a 1 L flask and stirred for 1 hour. The reaction is monitored by TLC(CH3CN/H2O-7:3 v/v).
The medium is next diluted in MeOH (25 mL) then evaporated to dryness in the presence of silica. The residue is placed on a column of silica gel. After purification by rapid chromatography on silica gel (acetonitrile/water: 8-2 v/v), we observe a contamination by copper (II) of the fractions containing our compounds 16, 17 and 18, discerned by a bluish colour. These fractions are combined then concentrated and passed through a column filled with a chelating resin, Dowex M4195, previously treated with a 2M solution of NH4OH then washed with distilled water until a pH of 7 is reached. The compounds 16, 17 and 18 are recovered by passing water through the column and are perfectly decontaminated as is shown by the colourless appearance of the solution and by measurement of the conductivity.
The compounds 16, 17 and 18 are obtained in a yield of 87% (12 g, 7 mmol) and in the form of a white powder after lyophilisation.
Mass Spectrometry (MALDI-TOF): 6 m/z=1561.51 [M+Na, H2O]+
1H NMR (400 MHz, D2O, 298K)
δ (ppm)=−0.01 (m, 21H, SiCH3 and 6×Si(CH3)3); 0.35 (m, 2H, SiCH2(α)); 1.63 (m, 2H, SiCH2CH2(β)); 2.12, 2.28 (2×s, 3H, rotamers, CH3 (Ac)); 3.29-3.89 (m, H-2, 3, 4, 5, 6a, 6b H-2, 3, 4, 5, 6Glc, Gal and Xyl and CH2OCH2); 4.09 (m, 1H, CHOH); 4.40-4.88 (m, CH(OH)CH2N, CH(OH)CH2N, CH2N(Ac), H-1Glc and Gal); 5.09, 4.97 (d, H-1Xyl); 5.45 (m, H-1Glc 1β); 7.86, 7.94 (s, 1H, H-5triazole).
Sodium ascorbate (2 equivs., 73.4 mg, 370 μmol) and copper sulphate freshly dissolved in 1M solution (1 equiv., 185 μL, 185 μmol) are added to a solution of the oligoxyloglucan derivatives containing the terminal alkyne 6(DP7), 7(DP8) and 8(DP9) (2 equivs., 500 mg, 370 μmol) and the polyorganosiloxane derivative 12 of average DP 10 (220 mg, 185 μmol) in 3 mL of water and 5 mL of iPrOH.
The solution is brought up to 50° C. in a sealed tube and agitated for 1 hour. The reaction is monitored by TLC(CH3CN/H2O-7:3 v/v).
The medium is next diluted in MeOH (25 mL) then evaporated to dryness in the presence of silica. The residue is placed on a column of silica gel. After purification by rapid chromatography on silica gel (acetonitrile/water: 8-2 v/v), the compounds 19, consisting of a multitude of combinations of condensation products and impossible to determine, are obtained with a mass yield of 81% (583 mg) and in the form of a white powder after lyophilisation.
1H NMR (300 MHz, D2O, 298K)
δ (ppm)=−0.07 (m, 57H, ˜9.5×Si(CH3)2); 0.35 (m, 4H, 2×SiCH2(α)); 1.49 (m, 4H, 2×SiCH2CH2(β)); 2.03, 2.18 (2×s, rotamers, CH3 (Ac)); 3.05-4.88 (m, H-2, 3, 4, 5, 6Glc, GaI and Xyl and CH2OCH2Si, CHOHSi, CH(OH)CH2N, CH(OH)CH2N, CH2N(Ac), H-1Glc and Gal); 4.97-5.09 (m, H-1Xyl); 5.32 (m, H-1Glc 1β); 7.82, 7.93 (s, 1H, H-5triazole).
IR (KBr): 3383 (OH), 2961 (C—H), 1644 (C═O), 1261 (C—O), 1044 and 1090 cm−1 (Si—O).
1H NMR (400 MHz, D2O, 298K)
δ (ppm)=0.76 (m, 3H, CH3); 1.10-1.32 (m, 30H, 15×CH2); 1.63 (m, 2H, CH3CH2); 1.90, 2.08 (2×s, 3H, rotamers, CH3 (Ac)); 3.12-4.86 (m, H-2, 3, 4, 5, 6Glc, Gal and Xyl); 4.75 (m, H-1Glc and Gal); 5.08 (d, H-1Xyl); 7.77, 7.90 (s, 1H, H-5triazole).
IR (KBr): 3402 (OH), 2921, 2851 (C—H).
| Number | Date | Country | Kind |
|---|---|---|---|
| 06 51744 | May 2006 | EP | regional |
| 06 51745 | May 2006 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP07/54691 | 5/15/2007 | WO | 00 | 2/27/2009 |
