133481-09-1Relevant articles and documents
Nitrilase-catalyzed selective hydrolysis of dinitriles and green access to the cyanocarboxylic acids of pharmaceutical importance
Zhu, Dunming,Mukherjee, Chandrani,Biehl, Edward R.,Hua, Ling
, p. 1667 - 1670 (2007)
To further explore its synthetic applications, the nitrilase bll6402 from Bradyrhizobium japonicum strain USDA110 has been examined toward the hydrolysis of various dinitriles. It has been found that nitrilase bll6402 effectively hydrolyzed α,ω-dinitriles to ω-cyanocarboxylic acids, and the selectivity was independent of the substrate chain length. This feature is distinct from all the known nitrilases of various sources. Nitrilase bll6402 was thus applied to the synthesis of 1-cyanocycloalkaneacetic acids, the useful precursors for the synthesis of gabapentin and its analogues.
Chemoenzymatic synthesis of gabapentin by combining nitrilase-mediated hydrolysis with hydrogenation over Raney-nickel
Xue, Ya-Ping,Wang, Ying-Peng,Xu, Zhe,Liu, Zhi-Qiang,Shu, Xin-Rui,Jia, Dong-Xu,Zheng, Yu-Guo,Shen, Yin-Chu
, p. 121 - 125 (2015)
An efficient chemoenzymatic process is devised for synthesizing high-purity gabapentin. 1-Cyanocyclohexaneacetic acid was first produced in 0.94 M from 1.0 M 1-cyanocycloalkaneacetonitrile by a greatly improved nitrilase from Acidovorax facilis ZJB09122, resulting in a commercially attractive bioprocess with an outstanding space-time yield of 461 g/L/day. The resulting aqueous 1-cyanocycloalkaneacetic acid was then directly converted to 2-azaspiro [4.5] decan-3-one without further purification in subsequent hydrogenation by Raney-nickel, followed by simple chemical steps to afford gabapentin in high purity and 77.3% overall yield from 1-cyanocyclohexylacetonitrile. The simplicity of the process makes this new pathway suitable for large-scale preparation.
PROCESS FOR PREPARING GABAPENTIN
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Page/Page column 17, (2008/06/13)
A process for preparing gabapentin of formula 1, which comprises Formula (I) converting 1-allyl-cyclohexanecarboxaldehyde into 1-allyl-cyclohexanecarbonitrile; ozonizing 1-allyl-cyclohexanecarbonitrile to obtain 1-cyano-cyclohexaneacetaldehyde; acetalizing 1-cyano-cyclohexaneacetaldehyde with a suitable acetalizing agent to give the corresponding acetal and converting the latter into gabapentin.
