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• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C233/00—Carboxylic acid amides
  • C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
  • C07C233/02—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals
  • C07C233/04—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with carbon atoms of carboxamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
  • C07C233/05—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with carbon atoms of carboxamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
  • C07C311/15—Sulfonamides having sulfur atoms of sulfonamide groups bound to carbon atoms of six-membered aromatic rings
  • C07C311/16—Sulfonamides having sulfur atoms of sulfonamide groups bound to carbon atoms of six-membered aromatic rings having the nitrogen atom of at least one of the sulfonamide groups bound to hydrogen atoms or to an acyclic carbon atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing three or more hetero rings
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
  • C08G83/002—Dendritic macromolecules
  • C08G83/003—Dendrimers

Definitions

• the invention relates to dendrimers and to methods for making dendrimers. More particularly, the invention relates to the use of click chemistry for synthesizing triazole dendrimers.
• Dendrimers have many uses. For example, the recently discovered ability of polydentate 1 ,4-disubstituted 1 ,2,3-triazoles ligands to stabilize Cu(I) species even in aqueous aerobic conditions (T. R. Chan, et al. Org. Lett. Submitted), has already proven crucial in biological applications (Q. Wang, et al. J. Am. Chem. Soc. 2003, 125, 3192-3193; A. E. Speers, et al. J. Am. Chem. Soc. 2003, 725, 4686-4687; A. J. Link, D. A. Tirrell J. Am. Chem. Soc.
• Triazole dendrimers can be employed for this purpose.
• dendrimers are employable for making porous materials, i.e., the dendrimers are mixed with a matrix material, the matrix material is solidified, and the dendrimers are vaporized.
• dendrimers of uniform size must be employed. Unfortunately, prior to the present disclosure, it was not practical to make dendrimers having a precisely uniform size, i.e., substantially all dendrimers having the same size.
• a highly efficient route for the production of triazole-based dendrimers employs click chemistry. This route benefits from the unprecedented reliability of the Cu(l)-catalyzed ligation of terminal acetylenes and azides.
• the chemistry is highly regioselective, resulting in 1 ,4-disubstituted triazoles.
• a variety of functional groups are compatible with the process and the only major byproduct formed in the reaction is NaCI. All second generation and some third generation dendrons were directly isolated as pure solids (i.e. no chromatographic separations), meeting the requirements for large scale applications.
• One aspect of the invention is directed to a process for producing a product dendron having a single azide group.
• the process comprises a first step wherein "n" organic azide molecules are reacted with an AB n molecule.
• the AB n molecule has "n" terminal acetylene functionalities and one halomethyl group, where "n” is two or greater.
• the reaction occurs in the presence of sufficient copper catalyst to insure complete reaction for producing a product molecule having "n " triazoles and one halomethyl group.
• the product molecule of the first step is reacted with sufficient sodium azide in an organic/aqueous solvent mixture at a temperature high enough to give complete or nearly complete displacement of the chloride from the halomethyl group for producing the product dendron having a single azide group.
• the product dendron is a first generation dendron.
• Preferred organic azides are selected from the group represented by the following structures:
• n is two.
• Preferred AB n molecules are selected from the group represented by the following structures:
• the product dendron is a second generation dendron and each of the "n" organic azide molecules is a first generation dendron. In this instance, the first generation dendron may also be made by the process of the invention or not.
• the product dendron is a third generation dendron and each of the "n" organic azide molecules is a second generation dendron. In this instance, the second generation dendron may also be made by the process of the invention or not.
• the product dendron is a fourth generation dendron and each of the "n" organic azide molecules is a third generation dendron. In this instance, the third generation dendron may also be made by the process of the invention or not.
• Another aspect of the invention is directed to a process for producing a triazole containing dendrimer.
• the process comprises the step of reacting two or more dendrons, each dendron possessing a single azide functionality, with a polyacetylene core compound, the polyacetylene core compound containing two or more terminal acetylene groups, in a suitable solvent and in the presence of catalytic quantity of copper(l) species for catalyzing a triazole formation reaction for forming the dendrimer.
• the process may include the further step of washing the product of the first step with sufficient aqueous ammonium hydroxide/citrate solution to remove copper species that may be bound to triazole moieties of the dendrimer.
• the polyacetylene core is selected from the group represented by the following structures:
• This process may be employed for making a first, second, third, or fourth generation dendrimer wherein the dendron is first, second, third, or fourth generation dendron, respectively.
• Another aspect of the invention is directed to the first, second, third, and fourth dendrimers made according to the above processes.
• Another aspect of the invention is directed to a trifunctional reagent represented by the following formula:
• X is a diradical selected from the group consisting of -O- and -S-; R is a radical selected from the group consisting of -Cl and -Br; n is 1-10; and m is 1-10.
• a preferred embodiment of this aspect of the invention may be represented by the following formula:
• Another aspect of the invention is directed to a trifunctional reagent represented by the following formula:
• R is a radical selected from the group consisting of -Cl and -Br; n is 1-10; and m is 1-10.
• R is a radical selected from the group consisting of -Cl and -Br; n is 1-10; and m is 1-10.
• Another aspect of the invention is directed to a trifunctional reagent represented by the following formula:
• R is a radical selected from the group consisting of -Cl and -Br; n is 1-10; and m is 1-10.
• R is a radical selected from the group consisting of -Cl and -Br; n is 1-10; and m is 1-10.
• Another aspect of the invention is directed to a core molecule represented by the following formula:
• n 1-10.
• Figure 1 illustrates an example of a large dendrimer that can be prepared by the method outlined.
• Figure 2 illustrates the copper(l)-catalyzed synthesis of 1 ,4-disubstituted
• Figure 3 illustrates the reaction sequence by which the individual branches or dendrons, were constructed, starting from the "outside" of the molecule.
• Figure 4 illustrates three structures that were chosen for the AB 2 monomers.
• FIG. 5 illustrates the different monoazides which are used for the chain ends.
• Figure 6 illustrates an NMR spectrum of the product b/s-triazole.
• Figure 7 illustrates the GPC traces for the crude reaction products, MEE-B-[G-4]-N 3 (9d), MEE-B-[G-3]-N 3 (6d), and MEE-B-[G-2]-N 3 (4d), obtained by dendritic growth from the benzyl ether monomer 11 , and the azido di(ethylene glycol) derivative 19.
• Figure 8 illustrates the structures of the polyacetylene cores to which the dendrons were anchored.
• Figure 9 illustrates a representative example of a dendrimer that is obtained by coupling a third generation dendron to a triacetylene core.
• Figure 10 illustrates a MALDl-TOF mass spectrum of dendrimer 7a.
• the primary chlorides were converted to the corresponding azides by reaction with 1.5 equivalents of sodium azide in acetone/water mixture, which was equally facile and typically resulted in yields of more than 95% with the only byproduct being NaCI.
• the dendrons were then 'grown 1 via the reaction of the resulting azides with the original monomers 11, 12 or 13. All second generation dendrons were isolated as pure white solids by simple filtration or aqueous workup, producing the second generation azide dendrons in isolated yields exceeding 90%.
• amide monomer 12 with terf-butyl azide 17 at the periphery as well as the benzyl ether monomer 11 with azide 19 were propagated to the fourth generation.
• Monomer 12 with the azide 16 and 19 at the periphery was propagated to the third generation, respectively.
• slight modification of reaction conditions led to the same degree of efficiency and near quantitative yields.
• benzyl terminated dendrimers prepared from 14 and 11 were found to be insoluble in 1 :1 H 2 O/THF solutions at second generation, resulting in no reaction.
• conversion of the chloromethyl group to the azide group was unsuccessful with aqueous sodium azide.
• Figure 1 shows an example of a large dendrimer that can be prepared by the method outlined.
• the different R groups shown allow for different solubilities of the resultant dendrimer.
• Figure 2 shows the copper(l)-catalyzed synthesis of 1 ,4-disubstituted 1 ,2,3-triazoles.
• the copper(l) is obtained by in situ reduction of the copper(ll) species, here obtained from copper sulfate.
• the reaction is run at ambient temperature in a water/alcohol solvent mixture to give nearly quantitative yields of the 1 ,2,3-triazole product.
• Figures 3A and 3B show the reaction sequence by which the individual branches or dendrons, were constructed, starting from the "outside” of the molecule. These are then coupled to a multivalent centerpiece or “core” in the last step.
• the internal repeat units are "X” and the chain end groups are "R.”
• Figure 4 shows three structures that were chosen for the AB 2 monomers. These were based on terminal acetylenes and alkyl halide functionalities. The structural feature, in addition to the diacetylene, that was retained between the three structures 11, 12, and 13 was the chloromethyl group. The reaction of dendritic fragments containing one chloromethyl group with sodium azide would lead to the quantitative formation of the azidomethyl group which would then be coupled with 11 , 12 or 13 to give the next generation dendron.
• Figure 5 shows the different monoazides which are used for the chain ends.
• the non-reactive groups have an aryl, alkyl and methoxyethoxy ends and the reactive end groups have carboxylic acid, benzyl alcohol and protected primary amine functionalities.
• Figure 6 is an NMR spectrum of the product b/s-triazole.
• the spectrum shows the complete lack of any regioisomers in the product as would be expected from a thermal cycloaddition reaction.
• the ratio of integration for protons f and c is 2:1 which shows that only one regioisomer is formed in the cycloaddition.
• the presence of two signals for both f and c protons is due to the different magnetic environments in the amide bond rotomers.
• Figure 7 shows the GPC traces for the crude reaction products, MEE-B-
• Figure 8 shows the structures of the polyacetylene cores to which the dendrons were anchored.
• Figure 9 is a representative example of a dendrimer that is obtained by coupling a third generation dendron to a triacetylene core.
• Figure 10 is a MALDI-TOF mass spectrum of dendrimer 7a. This time- of-flight mass spectrum was part of the proof of purity of this product.
• Permeation Chromatography was performed in tetrahydrofuran (THF) on a Waters chromatograph equipped with four 5- ⁇ m Waters columns (300 mm x 7.7 mm) connected in series with increasing pore size (two mixed B, 10 3 A, 10 5 A).
• a Waters 410 differential refractometer and a 996 photodiode array detector were employed. The molecular weights of the polymers were calculated relative to linear polystyrene standards.
• the modulated differential scanning calorimetry (MDSC) measurements were performed with the TA Instruments DSC 2920 and a ramp rate of 4 degrees per minute.
• R-X-[G-n]-Y where R describes the functional groups at periphery, Bn for benzyl , Boc for ferf-butyl ethylcarbamate, tBu for te/f-butyl, MEE for (2-methoxyethoxy)ethane;
• X describes internal repeat units, B for 1 , 3 dioxybenzene, F for formamide, S for benzenesulfonamide;
• n is the number for generations;
• Y describes functional group at the focal point, either chloride, Cl, or azide, N 3 .
• the white cloudy suspension was diluted with 10 ml H 2 O and 1 ml concentrated NH 4 OH, stirred for 10 minutes, and then filtered. The resulting filtrate, a white powder, was washed 3 times with 10 ml H 2 O and dried to obtain the pure Bn-F-[G-I]-CI 1b. (737 mg, 96% yield).
• MALDI-TOF 1076 (MNa + ), PDI: 1.01.
• the reaction mixture is diluted with 5 ml H 2 O and 1 ml concentrated NH 4 OH/citrate buffer, stirred for 2 minutes and extracted 3 times with 30 ml portions of CHCI 3 .
• the organic layer is washed with brine, dried over NaSO 4 , and evaporated to yield a while solid, which is then purified by prep-HPLC (pump flow gradient settings- solvent CH 3 CN/H 2 O; flowing rate: 6.5 ml/min, 0 min, 29% CH 3 CN; 2 min, 58 % CH 3 CN, 30 min 80% CH 3 CN) to give pure dendrimer 7a 150mg, 90% yield.

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• 2005
  • 2005-06-30 CN CNA2005800284873A patent/CN101006119A/zh active Pending
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