在无溶剂和球磨条件下,在绿色有机介质中进行了南极假丝酵母脂肪酶 B 催化的碳环5-8 元顺式 β-氨基酯水解。根据在有机介质中观察到的高对映选择性因子 ( E > 200),β-氨基酯的制备级拆分是在 65 °C 的t BuOMe 中进行的。未反应的 β-氨基酯对映体 (1 R ,2 S ) 和产物 β-氨基酸对映体 (1 S , 2 R ) 的对映体过量 ( ee ) 值适中至极佳( ee s > 62% 和ee p> 96%) 和良好的化学收率 (>25%) 在一个或两个步骤中。对映异构体很容易通过有机溶剂/H 2 O 萃取分离。
在无溶剂和球磨条件下,在绿色有机介质中进行了南极假丝酵母脂肪酶 B 催化的碳环5-8 元顺式 β-氨基酯水解。根据在有机介质中观察到的高对映选择性因子 ( E > 200),β-氨基酯的制备级拆分是在 65 °C 的t BuOMe 中进行的。未反应的 β-氨基酯对映体 (1 R ,2 S ) 和产物 β-氨基酸对映体 (1 S , 2 R ) 的对映体过量 ( ee ) 值适中至极佳( ee s > 62% 和ee p> 96%) 和良好的化学收率 (>25%) 在一个或两个步骤中。对映异构体很容易通过有机溶剂/H 2 O 萃取分离。
Synthesis of mono- and dihydroxy-substituted 2-aminocyclooctanecarboxylic acid enantiomers
作者:Márta Palkó、Gabriella Benedek、Enikő Forró、Edit Wéber、Mikko Hänninen、Reijo Sillanpää、Ferenc Fülöp
DOI:10.1016/j.tetasy.2010.05.003
日期:2010.4
(1R,2S,6R)-2-Amino-6-hydroxycyclooctanecarboxylic acid (-)-10 was synthesized from (1R,2S)-2-aminocyclooct-5-enecarboxylic acid (+)-2 via an iodolactone intermediate, while (1R,2S,3R,4S)-2-amino-5,6-dihydroxycyclooctanecarboxylic acid (-)-12 was prepared by using the OsO4-catalysed oxidation of Boc-protected amino ester (-)-5. The stereochemistry and relative configurations of the synthesized compounds were determined by 1D and 2D NMR spectroscopy (based on 2D NOE cross-peaks and (3)J(H,H) coupling constants) and X-ray crystallography. (C) 2010 Elsevier Ltd. All rights reserved.
A de novo Stereocontrolled Synthetic Approach to a Functionalized Indolizidine Core
作者:Loránd Kiss、Melinda Nonn、Jorge Escorihuela
DOI:10.1055/s-0042-1751388
日期:2023.1
A convenient dominosynthetic approach for the construction of the indolizidine core in diastereoselective manner has been developed from inexpensive starting compounds, providing triple functionalization. The novel syntheticroute started from β-lactam derived from 1,5-cyclooctadiene including a ring-opening metathesis/cross-metathesis sequence as key steps with methyl acrylate followed by intramolecular
Novel stereocontrolled syntheses of tashiromine and epitashiromine
作者:Loránd Kiss、Enikő Forró、Ferenc Fülöp
DOI:10.3762/bjoc.11.66
日期:——
A novelstereocontrolledapproach has been developed for the syntheses of tashiromine and epitashiromine alkaloids from cyclooctene beta-amino acids. The synthetic concept is based on the azetidinone opening of a bicyclic beta-lactam, followed by oxidative ring opening through ring C-C double bond and reductive ring-closure reactions of the cis- or trans-cyclooctene beta-amino acids.