Enantiomeric Analysis of Homologous Series of Secondary Alcohols by Deuterium NMR Spectroscopy in a Chiral Nematic Liquid Crystal: Influence of Molecular Geometry on Chiral Discrimination
摘要:
NMR measurements of the differential ordering effect (DOE) are presented for homologous series of 22 chiral secondary aliphatic alcohols dissolved in a poly-(gamma-benzyl-L-glutamate) (PBLG)/dichloromethane liquid-crystalline solvent. The quadrupolar splittings of the solutes, which were deuterated at their chiral centres, were measured as a function of the PBLG concentration and temperature. The proton dipolar splittings of the dichloromethane in each sample were also measured and used as a reference. The results are analysed qualitatively in terms of the structures of the molecules and their asymmetric (or chiral) characteristics. Emphasis is put on comparative analysis of the chiral discrimination in members of each particular homologous series and on evaluating the Limits of the technique for molecules that have two very similar groups attached to their stereogenic centres.
The oxidation of gem-disilylalkanes, which can be derived from 1,1-disilylethene, alkyllithiums and alkyl halides, affords the corresponding ketones.
可以衍生自1,1-二甲硅烷基乙烯,烷基锂和卤代烷的宝石-二甲硅烷基烷烃的氧化得到相应的酮。
A Novel Synthesis of Internal Alkenyldialkylborane by the Reaction of 1-Halo-1-alkenyldialkylborane with Grignard Reagent
作者:Akira Arase、Masayuki Hoshi、Yuzuru Masuda
DOI:10.1246/bcsj.57.209
日期:1984.1
To synthesize internal alkenyldialkylboranes, coupling reactions were carried out by using 1-halo-l-alkenyldialkylboranes and Grignardreagents. Hydrogen peroxide oxidation and protonolysis with acetic acid of the reaction product revealed that internal (E)-alkenyldialkylborane was formed in 60–90% yield.
[EN] NEW AZASPIRODECANONE COMPOUNDS AS HSL INHIBITORS<br/>[FR] NOUVEAUX COMPOSÉS D'AZASPIRODÉCANONE EN TANT QU'INHIBITEURS DE LA HSL
申请人:HOFFMANN LA ROCHE
公开号:WO2012130679A1
公开(公告)日:2012-10-04
The invention provides novel compounds having the general formula (I) wherein R1, R2, R3, R4, R5 and A are as described herein, compositions including the compounds and methods of using the compounds.
[reaction: see text] Exposure of monocarbonyl iodonium ylides, generated by the ester exchange of (Z)-(2-acetoxyvinyl)-lambda(3)-iodanes with EtOLi, to organoboranes results in a 1,2-shift of a carbon ligand from boron to the ylide carbons, which probably generates hitherto uncharacterized alpha-boryl ketones.
[EN] SEC-HYDROXYCYCLOHEXYL DERIVATIVES AS HSL INHIBITORS FOR THE TREATMENT DIABETES<br/>[FR] DÉRIVÉS SEC-HYDROXYCYCLOHEXYLES EN TANT QU'INHIBITEUR DE HSL POUR LE TRAITEMENT DU DIABÈTE
申请人:HOFFMANN LA ROCHE
公开号:WO2012123432A1
公开(公告)日:2012-09-20
The invention provides novel compounds having the general formula (I) wherein R1, R2 and R3 are as described herein, and compositions including the compounds. The use of the compounds as inhibitors of hormone sensitive lipose (HSL) for the treatment of diseases such as diabetes and metabolic symdrome is also disclosed.