Solvent and in situ catalyst preparation impacts upon Noyori reductions of aryl-chloromethyl ketones: application to syntheses of chiral 2-amino-1-aryl-ethanols
摘要:
As part of medicinal chemistry efforts we found it necessary to develop general syntheses of highly enantiomerically enriched 1-aryl-2-chloroethanols and 1-aryl-2-methylaminoethanols. A survey of literature methods suggested that a truly general approach had not yet been reported, encouraging us to undertake the development of such a methodology. This study describes the design, development, and reduction to practice of a general synthesis of chiral 1-aryl-2-chloroethanols and the transformation of these entities to highly enantiomerically enriched 1-aryl-2-methylaminoethanols. Of particular importance were observations of the impact of solvent and the method of catalyst preparation on the yield and enantiomerical excess of chlorohydrins prepared via Noyori transfer hydrogenations of aryl-chloromethyl ketones. (c) 2006 Elsevier Ltd. All rights reserved.
AZOLE DERIVATIVE, INTERMEDIATE COMPOUND, METHOD FOR PRODUCING AZOLE DERIVATIVE, AGRICULTURAL OR HORTICULTURAL CHEMICAL AGENT, AND PROTECTIVE AGENT FOR INDUSTRIAL MATERIAL
申请人:Kureha Corporation
公开号:US20200288714A1
公开(公告)日:2020-09-17
It is provided a plant disease controlling agent having low toxicity to human and animals and excellent handling safety, and showing excellent controlling effects on various plant diseases and high antibiotic action to plant disease germs.
A compound represented by the following the general formula (I), or an N-oxide or agrochemically acceptable salt thereof.
[EN] PROCESS TO PRODUCE ENANTIOMERICALLY ENRICHED 1-ARYL- AND 1-HETEROARYL-2-AMINOETHANOLS<br/>[FR] PROCEDE DE PREPARATION D'1-ARYL- ET D'1-HETEROARYL-2-AMINOETHANOLS ENRICHIS EN ENANTIOMERES
申请人:UPJOHN CO
公开号:WO2004085414A1
公开(公告)日:2004-10-07
The invention relates to a method of preparing enantiomerically enriched amino alcohols of Formula (I) wherein the variable R1, R2, and R3 are defined herein.
这项发明涉及一种制备式(I)的对映体富集氨基醇的方法,其中变量R1、R2和R3在此处被定义。
Antiviral agents
申请人:——
公开号:US20040138449A1
公开(公告)日:2004-07-15
The invention provides a compound of formula I:
1
wherein G, R
2
, and R
3
have any of the values defined in the specification, or a pharmaceutically acceptable salt thereof, as well as processes and intermediates useful for preparing such compounds or salts, and methods of treating a herpesvirus infection using such compounds or salts.
The present invention provides a compound of formula I
1
or a pharmaceutically acceptable salt thereof wherein R
1
, R
2
and R
3
are as defined in the specification. The compounds are useful for the treatment of viral infections.
A practical synthesis of optically active aromatic epoxides via asymmetric transfer hydrogenation of α-chlorinated ketones with chiral rhodium–diamine catalyst
A practical method for the synthesis of optically active aromatic epoxides has been developed via the formation of optically active α-chlorinated alcohols and intramolecular etherification. Optically active alcohols with up to 99% ee can be obtained from the asymmetric reduction of aromaticketones with a substrate/catalyst ratio of 1000–5000 using a formic acid/triethylamine mixture containing a well-defined