Linked Life Data

17441160

Source:http://linkedlifedata.com/resource/pubmed/id/17441160

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2007-4-18
pubmed:abstractText
The full details of the asymmetric epoxidation of alpha,beta-unsaturated esters catalyzed by yttrium complexes with biaryldiol ligands are described. An yttrium-biphenyldiol catalyst, generated from Y(OiPr)3-biphenyldiol ligand-triphenylarsine oxide (1:1:1), is suitable for the epoxidation of various alpha,beta-unsaturated esters. With this catalyst, beta-aryl alpha,beta-unsaturated esters gave high enantioselectivities and good yields (< or = 99% ee). The reactivity of this catalyst is good, and the catalyst loading could be decreased to as little as 0.5-2 mol % (the turnover number was up to 116), while high enantiomeric excesses were maintained. For beta-alkyl alpha,beta-unsaturated esters, an yttrium-binol catalyst, generated from Y(OiPr)3-binol ligand-triphenylphosphine oxide (1:1:2), gave the best enantioselectivities (< or = 97% ee). The utility of the epoxidation reaction was demonstrated in an efficient synthesis of (-)-ragaglitazar, a potential antidiabetes agent.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1861-471X
pubmed:author
pubmed:issnType
Electronic
pubmed:day
5
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
257-64
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Catalytic asymmetric epoxidation of alpha,beta-unsaturated esters with chiral yttrium-biaryldiol complexes.
pubmed:affiliation
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't