Enzymatic kinetic resolution of Morita-Baylis-Hillman acetates
摘要:
Racemic Morita-Baylis-Hillman adducts derived from the reaction of acrylonitrile with benzaldehyde, cinnamaldehyde and hydrocinnamaldehyde have been successfully resolved by means of enzymatic kinetic resolution. The (+)-alcohol products were isolated with 94-97% ee after lipase-mediated enantios-elective hydrolysis of the corresponding acetates. Mosher's double derivatisation protocol was applied to these isolated products and the absolute configuration of the alcohols was found to be (S) for all three substrates. (C) 2017 Elsevier Ltd. All rights reserved.
Morita-Baylis-Hillman adducts undergo smooth allylic nucleophilic substitution (SN2′) with allyltrimethylsilane in the presence of BF 3 ·OEt 2 under mild reaction conditions to afford 1,5-diene derivatives in good yields with high selectivity.
Preparation of Multifunctional Stereodefined Dienes
作者:Fanie R. van Heerden、Johan J. Huyser、Cedric W. Holzapfel
DOI:10.1080/00397919408010606
日期:1994.11
A number of multifunctional 1,3-dienes with defined stereochemistry were prepared by using the products obtained in DABCO-catalyzed condensation reactions of alpha,beta-unsaturated aldehydes with acrylonitrile or methyl acrylate, as substrates for nucleophilic substitution reactions.
van Heerden Fanie R., Huyser Johan J., Holzapfel Cedric W., Synth. Commun, 24 (1994) N 20, S 2863-2872
作者:van Heerden Fanie R., Huyser Johan J., Holzapfel Cedric W.