Candida antarctica lipase-catalyzed hydrolysis of 4-substituted bis(ethoxycarbonylmethyl) 1,4-dihydropyridine-3,5-dicarboxylates as the key step in the synthesis of optically active dihydropyridines
摘要:
Prochiral bis(ethoxycarbonylmethyl) substituted 4-aryl-1,4-dihydropyridine-3,5-dicarboxylates were hydrolyzed enantioselectively by Candida antarctica lipase B (Novozym 435). The enantiomeric excesses varied from 68 to 93%, depending on the substituent at position 4. In some cases, the e.e. could be significantly increased by changing the solvent system. (C) 2000 Elsevier Science Ltd. All rights reserved.
Candida antarctica lipase-catalyzed hydrolysis of 4-substituted bis(ethoxycarbonylmethyl) 1,4-dihydropyridine-3,5-dicarboxylates as the key step in the synthesis of optically active dihydropyridines
摘要:
Prochiral bis(ethoxycarbonylmethyl) substituted 4-aryl-1,4-dihydropyridine-3,5-dicarboxylates were hydrolyzed enantioselectively by Candida antarctica lipase B (Novozym 435). The enantiomeric excesses varied from 68 to 93%, depending on the substituent at position 4. In some cases, the e.e. could be significantly increased by changing the solvent system. (C) 2000 Elsevier Science Ltd. All rights reserved.
The first enantioselective protease-catalyzed hydrolyses of 1,4-dihydropyridine-3,5-dicarboxyric diesters were developed. The monoesters obtained had high optical purity and were useful chiral building blocks which could easily lead to opticallyactive Cablockers.
Carbamoylmethyl group as an activated group in protease- and base-catalyzed transesterification of 1,4-dihydropyridines: A novel asymmetric synthesis of valnidipine
The first protease-catalyzed enantioselective transesterification of 1,4-dihydropyridine-3,5-dicarboxylates in an aqueous solution was developed with high optical purity. Carbamoylmethyl ester group was enantioselectively transesterificated with (S)-N-benzyl-3-pyrroridinol by the protease and successive base-catalyzed transesterification proceeded smoothly to give the chiral drug, valnidipine, in a good yield.
Inversion of enantioselectivity in hydrolysis of 1,4-dihydropyridines by point mutation of lipase PS
Mutant of lipase PS replaced three amino acids by site-specific mutagenesis first showed the inversion of enantioselectivity and the solvent effect in hydrolysis of 1,4-dihydropyridines.