Molybdenum(VI)(oxo-diperoxo) complexes bearing bidentateligands with hydroxy and carbonyl functions show asymmetric induction in the stoichiometric epoxidation of simple prochiral olefins. The influence of the ligand and alkene structure on the enantiomeric excess of the oxiranes has been investigated. The addition of chiral diols to the molybdenum(VI)(oxo-diperoxo) reagents gives high enantiomeric
[EN] QUINAZOLINE DERIVATIVES AS ERBB RECEPTOR TYROSINE KINASES<br/>[FR] DERIVES DE QUINAZOLINE UTILISES COMME TYROSINE KINASES DU RECEPTEUR ERBB
申请人:ASTRAZENECA AB
公开号:WO2005118572A1
公开(公告)日:2005-12-15
The invention concerns quinazoline derivatives of the formula (I), wherein each of R1, R2, R3, R4, R5, R6, R7, X1, Q1, m and n have any of the meanings defined in the description; processes for their preparation, pharmaceutical compositions containing them and their use in the manufacture of a medicament for use as an antiproliferative agent in the prevention or treatment of tumours which are sensitive to inhibition of erbB receptor tyrosine kinases.
A Useful Preparation of<i>O</i>-Protected α-Hydroxyketones of Defined Enantiomeric Purity from 2-Hydroxyalkanoic Esters
作者:Marc Larchevêque、Yves Petit
DOI:10.1055/s-1986-31478
日期:——
α-Hydroxyketones (OH-protected) are prepared in high enantiomeric purity by reaction of chiral O-protected 2-hydroxyalkanoic esters with organolithium compounds in ether/pentane at - 100°C or by conversion of 2-hydroxyalkanoic esters into 2-hydroxy-N,N-dimethylalkanamides, O-protection of these amides, and reaction with organomagnesium bromides in tetrahydrofuran/ether at 5°C.
Trichloro- and methyldichlorogermyl monochelates and dibromo- and dichlorogermyl bischelates derived from N,N-disubstituted amides of 2-hydroxycarboxylic acids
作者:D. V. Airapetyan、T. P. Murasheva、S. Yu. Bylikin、A. A. Korlyukov、A. G. Shipov、S. V. Gruener、E. P. Kramarova、Vad. V. Negrebetskii、S. A. Pogozhikh、G. Ya. Zueva、M. Yu. Antipin、Yu. I. Baukov
DOI:10.1007/s11172-012-0093-7
日期:2012.3
The reactions of GeCl4, GeBr4, and MeGeCl3 with O-trimethylsilyl derivatives of N,N-disubstitutedamides of 2-hydroxycarboxylic acids afforded pentacoordinate and hexacoordinate neutral (O,O)-mono- and (O,O)-bischelates. The reactions of glycolic acid derivatives with GeX4 produced bischelates X2Ge[OCH2C(O)NR2R3]27a,c,d (X = Cl, R2 = R3 = Me (a), (CH2)5 (c), (CH2CH2)2O (d)) and 8a (X = Br). By contrast