- Evidence and exploitation of dicationic ammonium-nitrilium superelectrophiles: direct synthesis of unsaturated piperidinones
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Exploiting superacid activation, the reactivity of aminonitriles was enhanced through the transient formation of highly reactive ammonium-nitrilium superelectrophiles. Demonstrated by usingin situlow-temperature NMR experiments and confirmed by X-ray diffraction analysis, these dications can be intramolecularly trapped by non-activated alkenes to generate unsaturated piperidinones, including enantioenriched ones, in a straightforward way.
- Cantin, Thomas,Morgenstern, Yvonne,Mingot, Agnès,Kornath, Andreas,Thibaudeau, Sébastien
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p. 11110 - 11113
(2020/10/05)
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- Synthesis method of vildagliptin
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The invention discloses a synthesis method of vildagliptin. The method comprises the following steps: performing esterification reaction on L-glutamic acid and ethanol to obtain L-glutamic acid-gamma-ethyl ester; reducing the L-glutamic acid-gamma-ethyl ester under the action of potassium borohydride to obtain L-proline; mixing L-proline with ethyl chloroformate for reaction to obtain acid anhydride; further reacting the acid anhydride with amine to obtain amide; dehydrating the amide under the action of phosphorus pentoxide to obtain an intermediate 1; performing substitution reaction on theintermediate 1 and chloroacetyl chloride to obtain an intermediate 2; and further reacting the intermediate 2 with 3-amino-1-adamantanol to obtain vildagliptin. The method has the advantages that fewimpurities are generated in the vildagliptin preparation process, the yield of the prepared vildagliptin is high, and compared with the prior art, the process is simpler, and the vildagliptin preparation cost is greatly reduced.
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- Evaluation of Amino Nitriles and an Amino Imidate as Organo?-catalysts in Aldol Reactions
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The efficiency of l -valine and l -proline nitriles and a tert -butyl?- l -proline imidate as organocatalysts for the aldol reaction have been evaluated. l -Valine nitrile was found to be a syn -selective catalyst, while l -proline nitrile was found to be anti -selective, and gave products in modest to good enantioselectivities. tert -Butyl l -proline imidate was found to be a very efficient catalyst in terms of conversion of starting reagents to products, and gave good anti -selectivity. The enantioselectivity of the tert -butyl l -proline imidate was found to be good to excellent, with products being formed in up to 94percent enantiomeric excess.
- Brown, Alexander J.,Clarke, Paul A.,Vagkidis, Nikolaos
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p. 4106 - 4112
(2019/10/28)
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- Preparation method for vildagliptin
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The invention provides a preparation method for vildagliptin. Through the presence of imidazo thiazole as a chiral ligand and a palladium catalyst, a vildagliptin product with high yield and high purity can be obtained by taking diethyl fumarate and amino protected (S)-3-amino-cyano-ethyl propanoate as initial raw materials through steps such as cyclization, deprotection and coupling; and the preparation method is short in reaction route, high in yield and less in by-product, so that production costs can be reduced, and industrial production can be realized.
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- Preparation method of intermediate of medicine vildagliptin for treating type 2 diabetes
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The invention discloses a preparation method of an intermediate of a medicine vildagliptin for treating type 2 diabetes. The preparation method comprises the steps that 1, 2-carboxyl pyrrolidine and N-phthalimide are subjected to condensation to obtain a compound shown as the formula I which is shown in the description; 2, in the presence of tris(2-phenylpyridine)iridium, silver bromide and a compound shown as the formula II, the compound shown as the formula I and trimethylsilyl cyanide are subjected to heating reaction to obtain (S)-2-cyanopyrrolidine; 3, the (S)-2-cyanopyrrolidine is reacted with chloroacetyl chloride to obtain the vildagliptin intermediate (S)-1-(2-chloracetyl)-2-cyanopyrrolidine. According to the preparation method, the adopted raw materials are wider in resource, thereaction is high in selectivity and yield, the chiral target compound is obtained, the conditions are mild, and the method is easy to implement.
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- Corresponding amine nitrile and method of manufacturing thereof
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The invention relates to a manufacturing method of nitrile. Compared with the prior art, the manufacturing method has the characteristics of significantly reduced using amount of an ammonia source, low environmental pressure, low energy consumption, low production cost, high purity and yield of a nitrile product and the like, and nitrile with a more complex structure can be obtained. The invention also relates to a method for manufacturing corresponding amine from nitrile.
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- Preparation method for Vildagliptin
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The invention relates to a preparation method for Vildagliptin. The preparation method comprises the following steps: using L-prolinamide as a raw material, performing the dehydration reaction with cyanuric chloride, and generating (S)-2-cyanopyrrolidine; performing the salt forming reaction to the (S)-2-cyanopyrrolidine and hydrogen chloride, to obtain intermediate-1; enabling the intermediate-1 to react with chloroacetic acid under the conditions of using EDCI as a condensing agent, using HOBt as a catalyst, and using DIEA as an acid-binding agent, to obtain intermediate-2; enabling the intermediate-2 to react with 3-amino-1-adamantanol, to obtain the Vildagliptin, filtering, concentrating, crystallizing, and re-filtering to obtain a Vildagliptin crude product; and preparing the Vildagliptin finished product by the acetone refining. The preparation method is capable of providing a new method, and reducing the generation of by-products in each step. The content of the disubstitution product of the Vildagliptin by-product and the 3-amino-1-adamantanol are reduced to less than 0.1%, the yield and purity of the Vildagliptin are effectively improved, the raw materials are easily obtained, the conditions are moderate, and the preparation method is suitable for the industrial large-scale production.
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Paragraph 0044
(2017/08/29)
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- IMPROVED PROCESS FOR PREPARATION OF VILDAGLIPTIN INTERMEDIATE
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Provided is an improved process for preparation of Vildagliptin intermediate, 1-chloro acetyl (S)-2-cyano pyrrolidine.
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Page/Page column 9
(2014/02/16)
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- PROCESS FOR PREPARATION OF DPP-IV INHIBITORS
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Process for the preparation of DPP-IV inhibitors, such as 1-[[(3-hydroxy-1-adamantyl) amino] acetyl]-2-cyano-(S)-pyrrolidine are disclosed.
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Page/Page column 19
(2011/09/19)
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- DIPEPTIDYL PEPTIDASE-IV INHIBITORS
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The present invention relates generally to pyrrolidine and thiazolidine DPP-IV inhibitor compounds. The present invention also provides synthetic methods for preparation of such compounds, methods of inhibiting DPP-IV using such compounds and pharmaceutical formulations containing them for treatment of DPP-IV mediated diseases, in particular, Type-2 diabetes.
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Page/Page column 128
(2008/06/13)
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