128013-69-4Relevant articles and documents
A ring-closing metathesis approach for the synthesis of (±)-pregabalin
Bobade, Vivek D.,Mhaske, Pravin C.,Vadgaonkar, Kamlesh S.,Shelke, Shivaji H.
, p. 847 - 851 (2012)
Efficient utilization of a Mannich-type reaction and the ring-closing metathesis (RCM) approach that leads to a convenient synthesis of 3-(aminomethyl)-5-methylhexanoic acid (pregabalin) is described. Springer-Verlag 2011.
Synthesis of (±)-Pregabalin by Utilizing a Three-Step Sequential-Flow System with Heterogeneous Catalysts
Ishitani, Haruro,Kanai, Kan,Saito, Yuki,Tsubogo, Tetsu,Kobayashi, Shū
, p. 6491 - 6494 (2017)
(±)-Pregabalin, a γ-amino acid derivative, has been synthesized by utilizing flow methods. A three-step sequential-flow reaction starting from commercial isovaleraldehyde and methyl malonate proceeded smoothly with heterogeneous catalysts to afford the precursor of pregabalin in yields of 75–100 %, and a space-time yield of 52.2 g/L d was reached. In addition, a heterogeneous catalyst for the Knoevenagel reactions of aldehydes with malonates, which is the first step of the synthesis, has been developed. Pregabalin was finally obtained by acid-catalyzed hydrolysis of the precursor followed by neutralization.
Method for preparing 3-aminomethyl-5-methylcaproic acid
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Paragraph 0023; 0028-0029; 0031-0032; 0035-0036; 0039, (2020/07/13)
The invention relates to a method for preparing 3-aminomethyl-5-methylcaproic acid, belonging to the technical field of chemistry. According to the preparation method, 3-methyl formate-5-methylhexanoic acid is used as a raw material, and the target product 3-aminomethyl-5-methylcaproic acid can be prepared through two steps of reactions including ammonia ester exchange and reduction. The method has the beneficial effects of simple process route, high product purity of 99.0% or above, less three wastes, no toxic agent, mild reaction conditions and low cost, and is suitable for industrial production.
Synthesis of (+/-)-Pregabalin and its novel lipophilic β-alkyl-substituted analogues from fatty chains
D'Oca, Caroline Da Ros Montes,Mass, Eduardo Bustos,Ongaratto, Renata Fontes,De Andrade, Arthur Motta,D'Oca, Marcelo G. Montes,Russowsky, Dennis
, p. 13230 - 13239 (2020/08/28)
In this work, were synthesized for the first time a series of new lipophilic β-alkyl substituted GABA derivatives from fatty alkyl chains. The synthesis of these GABA analogues was investigated by two different bicomponent approaches as a key step. The results showed low yields in the path from aliphatic nitroolefins and Meldrum's acid, whereas the Knoevenagel condensation between aliphatic aldehydes and Meldrum's acid afforded fatty alkylidenes in good yields (75-97%). These compounds were subsequently subjected to a conjugate addition reaction with nitromethane, resulting in the fatty Michael adducts (in 87-97% yields) which were in turn submitted to a one pot domino hydrolysis-decarboxylation, leading to the isolation of β-alkyl-substituted γ-nitro acids in good yields (78-92%). Finally, the reduction of the fatty γ-nitro acids allowed for the access to new lipophilic β-alkyl substituted GABA analogues, which were isolated in high yields (90-98%). The new methodology was also applied to the synthesis of antiepileptic drug (+/-)-Pregabalin, which was obtained after four steps in high overall yield. This journal is
