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|Type:||Artigo de periódico|
|Title:||Synthesis Of Conformationally Restricted Acetylcholine Analogues. Comparing Lipase-mediated Resolution With Simulated Moving Bed Chromatography Of Arylated β-hydroxy-pyrrolidines|
|Abstract:||The enantiodivergent synthesis of new, conformationally restricted acetylcholine analogues was accomplished using arylated endocyclic enecarbamates as key intermediates. Stereoselective hydroboration of the aryl enecarbamates provided the corresponding aryl-β-hydroxy-pyrrolidines. Acetylation, deprotection, followed by N-bismethylation, led to the desired betaine products. The kinetic resolution of the intermediate alcohols was performed by lipase-mediated hydrolysis of its acetate derivatives, resulting in excellent enantioselectivities (E > 100). An enzymatic enantiopreference predicted by the Kazlauskas's model was confirmed following Riguera's protocol. Finally, chromatographic resolution of racemic alcohol 5a was evaluated by semi-preparative scale chiral simulated moving bed chromatography and its performance compared with biocatalysis. © 2007 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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