摘要Prozessintensivierung durch kontinuierliche Flussreaktionen hat die Produktionsraten von Feinchemikalien und Pharmazeutika deutlich erhöht。催化反应是一种非常规和特殊的方法,适用于 Hochleistungs-Flüssig/Flüssig-Gegenstrom 色谱系统。Produkte werden erheblich schneller 还属于 Herkömmlichen Batch-Reaktoren 或分段式 Durchflusssystemen gebildet,是一种立体选择性相转移催化反应演示器。强化生物催化反应的方法,以及倍半萜环化酶-催化剂合成的倍半萜烯合成方法工业区 倍半萜合成物中的产品是一种疏水性物质,其本质是倍半萜的限制,它
Asymmetric dearomative spirolactonization of naphthols using λ3-iodanes under chiral phase-transfer catalysis
作者:Kevin Antien、Guillaume Viault、Laurent Pouységu、Philippe A. Peixoto、Stéphane Quideau
DOI:10.1016/j.tet.2017.04.028
日期:2017.6
The asymmetric phase-transfer catalytic effect of chiral Cinchona alkaloid-derived quaternary ammonium salts was investigated in the context of the λ3-iodane-mediated dearomative spirolactonization of naphthols. The scope and limitations of this methodology were evaluated using various substrates, which were converted into spirolactones in good yields and with enantiomeric excesses up to 58%.
Stereocontrolled [<sup>11</sup>
C]Alkylation of N-Terminal Glycine Schiff Bases To Obtain Dipeptides
作者:Ulrike Filp、Aleksandra Pekošak、Alex J. Poot、Albert D. Windhorst
DOI:10.1002/ejoc.201701129
日期:2017.10.10
stereoselective radiochemical [11C]alkylation to obtain functionalized dipeptides. We herein report a broadly applicable procedure for the asymmetric [11C]alkylation of dipeptides to give labeled N-terminal peptides by using different [11C]alkyl halides. Contended stereoselectivities of the reactions were observed by using 11C-labeled alkyl halides, [11C]methyl iodide and [11C]benzyliodide, and diastereomeric
[reaction: see text]. A chiral phase-transfer catalyst has been applied to the asymmetricallylation of the tert-butyl glycinate-benzophenone Schiff base with various allylic acetates for the first time to give the allylated products in good yields and with comparable to higher enantioselectivity than for asymmetric alkylation at the same temperature (91-96% ee) without any chiral ligands for coordinating
A new class of asymmetric phase-transfer catalysts derived from Cinchona alkaloids — Application in the enantioselective synthesis of α-amino acids
作者:Barry Lygo、Philip G. Wainwright
DOI:10.1016/s0040-4039(97)10293-3
日期:1997.12
new class of Cinchona alkaloid-derived quaternary ammonium phase-transfercatalysts bearing a N-anthracenylmethyl function are presented. These catalysts show high stereocontrol in the asymmetric alkylation of a benzophenone-derived glycine-imine, and application of this process to the enantioselectivesynthesis of a range of α-aminoacid esters (e.e. 67–94%) is investigated.
Asymmetric phase-transfer mediated epoxidation of α,β-unsaturated ketones using catalysts derived from Cinchona alkaloids
作者:Barry Lygo、Philip G. Wainwright
DOI:10.1016/s0040-4039(97)10779-1
日期:1998.3
The enantioselective epoxidation of α,β-unsaturated ketones utilising Cinchona alkaloid-derived quaternary ammonium phase-transfer catalysts bearing an N-anthracenylmethyl function are presented. It has been found that the O-benzyl derivatives of these catalysts in conjunction with sodium hypochlorite give high stereocontrol and application of this process to the enantioselective synthesis of a range