Novel chiral lipoxygenase substrates: design and synthesis. Part 2
摘要:
A series of novel lipoxygenase substrates carrying a spacing modifier with a non-ionic hydroxyl terminus have been synthesized in an enantioselective fashion. One of the methylene hydrogens (flanked by the cis,cis-pentadienyl moiety) is replaced by alkyl, aryl and hydroxyl groups. The key steps in the synthesis involved enzymatic transesterification of 1,3-propanediol derivatives and two consecutive cis-selective Wittig olefinations. (C) 2002 Elsevier Science Ltd. All rights reserved.
Enantioselective Desymmetrization of 2-Aryl-1,3-propanediols by Direct <i>O</i>-Alkylation with a Rationally Designed Chiral Hemiboronic Acid Catalyst That Mitigates Substrate Conformational Poisoning
作者:Carl D. Estrada、Hwee Ting Ang、Kim-Marie Vetter、Ashley A. Ponich、Dennis G. Hall
DOI:10.1021/jacs.1c00759
日期:2021.3.24
operationally simple, ambient conditions. Nucleophilic activation and discrimination of the enantiotopic hydroxy groups on the diol substrate occurs via a defined chairlike six-membered anionic complex with the hemiboronic heterocycle. The optimal binaphthyl-based catalyst 1g features a large aryloxytrityl group to effectively shield one of the two prochiral hydroxy groups on the diol complex, whereas
Novel chiral lipoxygenase substrates: design and synthesis. Part 2
作者:J.S. Yadav、S. Nanda
DOI:10.1016/s0957-4166(02)00009-5
日期:2001.12
A series of novel lipoxygenase substrates carrying a spacing modifier with a non-ionic hydroxyl terminus have been synthesized in an enantioselective fashion. One of the methylene hydrogens (flanked by the cis,cis-pentadienyl moiety) is replaced by alkyl, aryl and hydroxyl groups. The key steps in the synthesis involved enzymatic transesterification of 1,3-propanediol derivatives and two consecutive cis-selective Wittig olefinations. (C) 2002 Elsevier Science Ltd. All rights reserved.