Enzymatic Resolution of Aminocyclopentenols as Precursors to <scp>d</scp>- and <scp>l</scp>-Carbocyclic Nucleosides
作者:Mark J. Mulvihill、Jennifer L. Gage、Marvin J. Miller
DOI:10.1021/jo972265a
日期:1998.5.1
Racemic cis-4-aminocyclopent-2-en-1-ols were synthesized in three steps utilizing hetero Diels-Alder chemistry. Starting from suitably protected hydroxylamines, oxidization with sodium periodate and trapping with cyclopentadiene afforded cycloadducts (+/-)-5a-d. The N-O bond of the cycloadducts was reduced with Mo(CO)(6) to afford (+/-)-cis-4-aminocyclopent-2-en-1-ols (+/-)-6a-d. These compounds, or their corresponding acetates, were kinetically resolved by enzymatic acetylation or hydrolysis, respectively. Enzymatic acetylation of cis-N-(benzylcarbamoyl)-4-aminocyclopent-2-enol [(+/-)-6a] with Candida antarctica B lipase and Pseudomonas species lipase gave the corresponding acetate (-)-7a in 90% and 92% ee, respectively, after 40% conversion. Enzymatic hydrolysis of cis-N-acetyl-4-aminocyclopent-2-enol 1-O-acetate (+/-)-7d with electric eel acetylcholine esterase was successful in providing both cis-N-acetyl-4-aminocyclopent-2-enols (+)ed and (+)-7d in 92% ee (99% ee after a single recrystallization) after 40% conversion. Further synthetic transformations of these resolved synthetic building blocks and derivatives are also reported.
Enantioselective synthesis of (1 S ,4 R )- N -(benzylcarbamoyl)-4-aminocyclopent-2-en-1-ol by Candida antarctica lipase B
作者:Hui-Jiao Wen、Qing Chen、Guo-Jun Zheng
DOI:10.1016/j.cclet.2015.07.005
日期:2015.11
An efficient biocatalytic process has been developed to obtain optically pure (15,4R)-N-(benzylcarbamoy1)-4-aminocyclopent-2-en-1-ol which can be used as the key intermediate of ticagrelor. In this research, several N-(benzylcarbamoy1)-4-aminocyclopent-2-en-1-ol derivatives have been investigated in which Candida antarctica lipase B (CALB) was used to catalyze the asymmetric hydrolysis reaction. As expected, some of these substrates successfully gave (1S,4R)-N-(benzylcarbamoy1)-4-aminocyclopent2-en-1-ol in >98% enantiomeric excess (ee) with conversion yields up to 45%. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
An asymmetric synthesis of (1S,4R)-4-amino-2-cyclopentenol derivatives
作者:Masatoshi Asami、Megumi Ogawa、Seiichi Inoue
DOI:10.1016/s0040-4039(99)00002-7
日期:1999.2
A highly enantioselective deprotonation of cis-4-aminocyclopentene oxide derivatives 1 was achieved by using a chiral lithium amide, prepared from (2S,3aS,7aS)-2-(pyrrolidin-1-ylmethyl) octahydroindole, (1S,4R)-4-Amino-2-cyclopentenol derivative 2 was obtained in up to 90 % ee. (C) 1999 Elsevier Science Ltd. All rights reserved.
EP0865439A4
申请人:——
公开号:EP0865439A4
公开(公告)日:1998-11-11
COMBINATORIAL LIBRARIES HAVING AMINODIOL MONOMER SUBUNITS