نتایج جستجو برای: chiral compounds

تعداد نتایج: 262114  

Journal: :Chemical communications 2009
Shilei Zhang Yinan Zhang Yafei Ji Hao Li Wei Wang

A new highly catalytic enantioselective Michael addition of fluorobis(phenylsulfonyl)methane to alpha,beta-unsaturated aldehydes has been developed for the preparation of chiral monofluoromethyl compounds under mild reaction conditions.

Journal: :Chemical communications 2011
Kana Tanaka Kenji Kukita Tomonori Ichibakase Shunsuke Kotani Makoto Nakajima

Chiral lithium binaphtholate effectively catalyzed the enantioselective alkynylation of ketones using lithium acetylide as an alkynylating agent. This is the first example of the catalytic enantioselective addition of lithium acetylide to carbonyl compounds without the aid of other metal sources.

Journal: :Chemical communications 2009
Francisco Sarabia Samy Chammaa Miguel García-Castro Francisca Martín-Gálvez

A new type of chiral sulfur ylides has been synthesized and their reactivities against carbonyl compounds tested, showing a high degree of stereoselectivity in the formation of trans epoxy amides under very mild reaction conditions.

Journal: :Chemical communications 2005
Manab Chakravarty Praveen Kommana K C Kumara Swamy

Non-stoichiometry and isostructurality in a set of chiral phosphorus compounds as a result of lone pair/oxygen exchange, substantiated by the combined use of 31P NMR spectroscopy and X-ray crystallography, is described.

Journal: :Organic & biomolecular chemistry 2008
Márcio W Paixão Martin Nielsen Christian Borch Jacobsen Karl Anker Jørgensen

The organocatalytic ring-opening of N-tosyl protected aziridines by beta-ketoesters under chiral PTC-conditions, leading to the formation of optically active aminoethyl functionalised compounds with up to 99% ee, has been developed.

2012
Chuanqi Zhao Jinsong Ren Janusz Gregoliński Jerzy Lisowski Xiaogang Qu

There is great interest in design and synthesis of small molecules which selectively target specific genes to inhibit biological functions in which particular DNA structures participate. Among these studies, chiral recognition has been received much attention because more evidences have shown that conversions of the chirality and diverse conformations of DNA are involved in a series of importan...

2016
Dolores Camacho-Muñoz Bruce Petrie Erika Castrignanò Barbara Kasprzyk-Hordern

The issue of drug chirality is attracting increasing attention among the scientific community. The phenomenon of chirality has been overlooked in environmental research (environmental occurrence, fate and toxicity) despite the great impact that chiral pharmacologically active compounds (cPACs) can provoke on ecosystems. The aim of this paper is to introduce the topic of chirality and its implic...

2013
Jan Labuta Shinsuke Ishihara Tomáš Šikorský Zdeněk Futera Atsuomi Shundo Lenka Hanyková Jaroslav V. Burda Katsuhiko Ariga Jonathan P. Hill

Enantiomeric excess of chiral compounds is a key parameter that determines their activity or therapeutic action. The current paradigm for rapid measurement of enantiomeric excess using NMR is based on the formation of diastereomeric complexes between the chiral analyte and a chiral resolving agent, leading to (at least) two species with no symmetry relationship. Here we report an effective meth...

Journal: :Nature chemistry 2011
Manuel Pérez Martín Fañanás-Mastral Pieter H Bos Alena Rudolph Syuzanna R Harutyunyan Ben L Feringa

Carbon-carbon bond formation is the basis for the biogenesis of nature's essential molecules. Consequently, it lies at the heart of the chemical sciences. Chiral catalysts have been developed for asymmetric C-C bond formation to yield single enantiomers from several organometallic reagents. Remarkably, for extremely reactive organolithium compounds, which are among the most broadly used reagent...

Journal: :Journal of Synthetic Organic Chemistry, Japan 1986

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