147769-93-5Relevant articles and documents
Synthesis process of hypoglycemic drug repaglinide
-
Paragraph 0076-0078; 0087-0089, (2020/09/16)
The invention discloses a synthesis process of a hypoglycemic drug repaglinide. The process comprises the following steps: a) by using a compound II (S,S')-3-methyl-1-(2-piperidinophenyl)butylamine asa raw material, dissociating with an alkali, and directly condensing the obtained organic phase containing a compound III repigine with a compound IV 3-ethoxy-4-ethoxycarbonyl phenylacetic acid in the presence of an acylation reagent and an alkali without concentration; b) refining the compound V repaglinide ester crude product obtained after condensation by using an alkane solvent; and c) hydrolyzing in the presence of an alcohol solvent and an inorganic alkali, carrying out acidifying of post-treatment at a proper temperature, and purifying the obtained compound I repaglinide crude productby using an alcohol-water mixed solvent to obtain a repaglinide fine product. The synthesis process provided by the invention simplifies the synthesis steps, has the advantages of environmental protection, simple operation, high yield, low cost and the like, and is a repaglinide synthesis process suitable for industrial large-scale production.
Synthesis method of repaglinide
-
, (2019/07/16)
The invention discloses a synthesis method of repaglinide, and belongs to the technical field of medicine synthesis. The method comprises the following steps that ortho-halogenated benzaldehyde is taken as a raw material, a 2-piperidine-1-benzaldehyde compound 1 is obtained through piperidine substitution and reacts with (R)-methylpropane-2-sulfinamide to obtain an imine compound 2, then the iminecompound 2 reacts with a 2-methyl-1-propylene Grignard reagent lithium chloride, and through reduction, an S-(+)-1-(2-piperidine phenyl)-3-methyl n-butylamine compound 3 is obtained; then the S-(+)-1-(2-piperidine phenyl)-3-methyl n-butylamine compound 3 and 4-carboxyl methyl-2-ethoxy benzoate are condensed to obtain an S-(+)-2-oxethyl-4-[N-{1-(2-piperidine phenyl)-3-methyl-1-butyl}amine carbonylmethyl]benzoate compound 4; finally, the repaglinide 5 is obtained through hydrolysis. Compared with other technologies, the synthesis method has the advantages that operation is simple, the raw materials are easy to obtain, the yield is high, the cost is low, and the method is environmentally friendly; the product repaglinide has very high optical purity and is suitable for industrial production.
Preparation method for (S)-(+)-1-(2-piperidine phenyl)-3-methyl n-butylamine
-
Paragraph 0016, (2016/10/08)
The invention provides a preparation method for (S)-(+)-1-(2-piperidine phenyl)-3-methyl n-butylamine. The method comprises process steps as described in the specification. According to the invention, the (S)-(+)-1-(2-piperidine phenyl)-3-methyl n-butylamine is synthesized with 3-methyl-1-(2-piperidine phenyl)-1-butanone as a raw material by using a catalytic asymmetric synthetic method. The synthetic method provided by the invention has the advantages of easily-available raw materials, short synthetic route and high yield.
Reversal diastereoselectivity between the organomagnesium and organolithium reagents on Chiral N-tert-butylsulfinylaldimines for the preparation of chiral amines
Rajendiran, Chinnapillai,Nagarajan, Periyandi,Naidu,Dubey
, p. 2936 - 2942 (2014/11/08)
The asymmetric synthesis of both the enantiomer of chiral amines from the single chiral source of N-tert-butylsulfinylaldimines (3) by simply changing the organometallic reagents through diastereoselective addition. An efficient enantioselective synthesis of chiral amines including (S)-3-methyl-1-(2- piperidin-1-yl-phenyl)butyl amine (6a), a key intermediate to prepare antidiabetic drug repaglinide (1), is reported.
Studies on diastereofacial selectivity of a chiral tert-butanesulfinimines for the preparation of (S)-3-Methyl-1-(2-piperidin-1-yl-phenyl)butylamine for the synthesis of repaglinide
Nagarajan, Periyandi,Rajendiran, Chinnapillai,Naidu,Dubey
, p. 9345 - 9350 (2013/11/19)
A new method for the asymmetric synthesis of a series of chiral amines including (S)-3-methyl-1-(2-piperidin-1-yl-phenyl)butylamine (2a) a key intermediate to prepare antidiabetic drug repaglinide by using Ellman's reagent tert-butanesulfinamide. Diastereoselective addition of organometallic reagents to t-butanesulfinimines and followed by acidic and basic treatment. The obtained chiral amines were characterized by NMR, MS and other analytical data.
Repaglinide Substantially Free of Dimer Impurity
-
Page/Page column 13, (2010/08/08)
The present invention provides highly pure repaglinide substantially free of dimer impurity, and process for the preparation thereof. The present invention also relates to 2-ethoxy-N-[(1S)-3-methyl-1-[2-(1-piperidinyl)phenyl]butyl]-4-[2-[[(1S)-3-methyl-1-[2-(1-piperidinyl)phenyl]butyl]amino]-2-oxoethyl]benzamide, an impurity of repaglinide, and a process for preparing and isolating thereof. The present invention further relates to pharmaceutical compositions comprising solid particles of pure repaglinide substantially free of dimer impurity or pharmaceutically acceptable salts thereof, wherein 90 volume-percent of the particles (D90) have a size of less than about 400 microns. The present invention also provides an optical resolution method of racemic 3-methyl-1-(2-piperidino-phenyl)-1-butylamine and use thereof for the preparation of repaglinide.
Process for the preparation of substantially optically pure Repaglinide and precursors thereof
-
Page/Page column 13, (2010/05/13)
The invention relates to a process for preparing substantially optically pure Repaglinide and pharmaceutically acceptable salts, solvates and esters thereof, as well as precursors therefore.
Process for preparing (alphaS)-alpha-(2-methylpropyl)-2-(1-piperidinyl)benzenemethanamine
-
Page/Page column 7, (2009/02/10)
The present invention relates to a process for the preparation of (αS)-α-(2-methylpropyl)-2- (1-piperidinyl)benzenemethanamine of Formula I, which is a key intermediate for the synthesis of Repaglinide.
An improved process for repaglinide via an efficient and one pot process of (1S)-3-methyl-1-(2-piperidin-1-ylphenyl)butan-1-amine - A useful intermediate
Kolla, Naveenkumar,Elati, Chandrashekar R.,Vankawala, Pravinchandra J.,Gangula, Srinivas,Sajja, Eswaraiah,Anjaneyulu, Yerremilli,Bhattacharya, Apurba,Sundaram, Venkataraman,Mathad, Vijayavitthal T.
, p. 593 - 597 (2007/10/03)
The development of a large-scale synthesis for (1S)-3-methyl-1-(2- piperidin-1-ylphenyl)butan-1-amine (S-(+)-1), a key intermediate of repaglinide (2), is described. The process conditions for S-(+)-1 involving nucleophilic substitution, Grignard reaction, reduction and resolution were optimized and telescoped. The racemization of the undesired enantiomer R-(-)-1 offers a distinctive advantage in terms of cost and overall yield over the existing process. This communication also describes the control of a DCU byproduct obtained during the condensation of S-(+)-1 with phenyl acetic acid derivative 3 in the synthesis of 2. Schweizerische Chemische Gesellschaft.
Repaglinide and related hypoglycemic benzoic acid derivatives
Grell, Wolfgang,Hurnaus, Rudolf
, p. 5219 - 5246 (2007/10/03)
The structure-activity relationships in two series of hypoglycemic benzoic acid derivatives (5, 6) were investigated. Series 5 resulted from meglitinide (3) when the 2-methoxy was replaced by an alkyleneimino residue. Maximum activity was observed with the cis-3,5-dimethylpiperidino (5h) and the octamethyleneimino (5l) residues. Series 6 resulted from the meglitinide analogon 4 bearing an inversed amido function when the 2-methoxy, the 5- fluoro, and the α-methyl residue were replaced by a 2-piperidino, a 5- hydrogen, and a larger α-alkyl residue, respectively. An alkoxy residue ortho to the carboxy group further increased activity and duration of action in the rat. The most active racemic compound, 6al (R4 = isobutyl; R = ethoxy), turned out to be 12 times more active than the sulfonylurea (SU) glibenclamide (1). Activity was found to reside predominantly in the (S)- enantiomers. Compared with the SUs 1 and 2 (glimepiride), the most active enantiomer, (S)-6al (AG-EE 623 ZW; repaglinide; ED50 = 10 μg/kg po), is 25 and 18 times more active. Repaglinide turned out to be a useful therapeutic for type 2 diabetic patients; approval was granted recently by the FDA and the EMEA. From investigations on the pharmacophoric groups in compounds of type 5 and 6, it was concluded that in addition to the two already known - the acidic group (COOH; S02NH) and the amidic spacer (CONH; NHCO) - the ortho residue R1 (alkyleneimino; alkoxy; oxo) must be regarded as a third one. A general pharmacophore model suitable for hypoglycemic benzoic acid derivatives, SUs, and sulfonamides is proposed (Figure 6). Furthermore, from superpositions of low-energy conformations (LECs) of 1, 2, and (S)-6al, it was concluded that a common binding conformation (LEC II; Figure 10B) may exist and that differences in binding to the SU receptor and in the mechanism of insulin release between repaglinide and the two SUs may be due to specific hydrophobic differences.