CAL-B (Novozym 435) plays a dual role in our approach to chiral polyamides. It is used to introduce the appropriate chirality in the synthesis of monomers (amino-esters and diamines) from racemic 12-methyldodecalactone and then to catalyze their polycondensation. The AB and AABB enzymatic polymerizations have been carried out under reduced pressure; they give rise to optically active polymers in good yield, with a good degree of polymerization, and a narrow polydispersity index. This approach demonstrates that the presence of a methyl group at the stereogenic center at the alpha-position relative to the nitrogen atom does not slow down the polymerization as compared with the polycondensation of a related achiral monomer. (c) 2012 Elsevier Ltd. All rights reserved.
CAL-B (Novozym 435) plays a dual role in our approach to chiral polyamides. It is used to introduce the appropriate chirality in the synthesis of monomers (amino-esters and diamines) from racemic 12-methyldodecalactone and then to catalyze their polycondensation. The AB and AABB enzymatic polymerizations have been carried out under reduced pressure; they give rise to optically active polymers in good yield, with a good degree of polymerization, and a narrow polydispersity index. This approach demonstrates that the presence of a methyl group at the stereogenic center at the alpha-position relative to the nitrogen atom does not slow down the polymerization as compared with the polycondensation of a related achiral monomer. (c) 2012 Elsevier Ltd. All rights reserved.
作者:Florent Poulhès、Dominique Mouysset、Gérard Gil、Michèle P. Bertrand、Stéphane Gastaldi
DOI:10.1016/j.tetasy.2012.05.021
日期:2012.6
CAL-B (Novozym 435) plays a dual role in our approach to chiral polyamides. It is used to introduce the appropriate chirality in the synthesis of monomers (amino-esters and diamines) from racemic 12-methyldodecalactone and then to catalyze their polycondensation. The AB and AABB enzymatic polymerizations have been carried out under reduced pressure; they give rise to optically active polymers in good yield, with a good degree of polymerization, and a narrow polydispersity index. This approach demonstrates that the presence of a methyl group at the stereogenic center at the alpha-position relative to the nitrogen atom does not slow down the polymerization as compared with the polycondensation of a related achiral monomer. (c) 2012 Elsevier Ltd. All rights reserved.