[EN] SELECTIVE INHIBITORS OF CLINICALLY IMPORTANT MUTANTS OF THE EGFR TYROSINE KINASE [FR] INHIBITEURS SÉLECTIFS DE MUTANTS CLINIQUEMENT IMPORTANTS DE LA TYROSINE KINASE DE L'EGFR
Enantioselective synthesis of non-proteinogenic amino acids via metallated bis-lactim ethers of 2,5-diketopiperazines
作者:Ulrich Schöllkopf
DOI:10.1016/s0040-4020(01)91926-x
日期:1983.1
excess = asymmetric induction) of the adduct exceeds 95%. On hydrolysis the adducts are cleaved liberating the chiral auxiliary (used to build up the bis-lactim ether 1) and the target molecules, the opticallyactive amino acid methyl esters of type 8,19,25 or 36. The two amino acid esters are separable either by fractional distillation or (eventually after further hydrolysis to amino acids) by chromatography
Aldéhydes α-silylés: préparation et propriétés nouvelles
作者:L. Duhamel、J. Gralak、B. Ngono
DOI:10.1016/0022-328x(89)88060-x
日期:1989.3
(Z)-β-silylenoxysilane (2), prepared from (Z-1-bromo-2-(trimethylsiloxy)ethylene by reaction with t-butyllithium followed by condensation with t-butyldimethylsilyl triflate. The lithium enolate of aldehyde 3 is prepared direct by reaction with lithiumdiisopropylamide or lithium hexamethyldisilazane; its condensation with trimethylchlorosilane leads to the (E)-β-silylenoxysilane (2) and with aldehydes
Asymmetric syntheses via heterocyclic intermediates-XXII
作者:Ulrich Schöllkopf、Joachim Nozulak、Ulrich Groth
DOI:10.1016/s0040-4020(01)82426-1
日期:1984.1
Enantioselective syntheses of α-alkenyl glycines of type 10 and of type 23 are described that provide these uncommon amino acids with predictable configuration and with ee-values of >95%. Both approaches are based on the bislactim ether method developed by Schöllkopf . As for 10: The lithiated bis-lactim ether 6 of cyclo (L-val-gly) is reacted with 2-[(dimethyl t-butyl)silyl]alkanals 2 to give the
Efficient Synthesis of Branched Propargyl- and Allylsilanes
作者:Lutz F. Tietze、Thomas Neumann、Masahiro Kajino、Martina Pretor
DOI:10.1055/s-1995-4034
日期:1995.8
The transformation of α-silylated aldehydes 3a-h into the propargylsilanes 5a-k and the (Z)-allylsilane 6 is described. The readily available tert-butylimine 1 of acetaldehyde is silylated and alkylated in a one-pot procedure to obtain the α-silylated aldehydes 3a-h after hydrolysis of the imine moiety in 77-96% yield. C-1 homologation by the Corey-Fuchs method gave 1,1-dibromoallylsilanes 4a-h in 70-96% yields which can be transformed into the mono- and disubstituted propargylsilanes 5a-k in 33-95% yield. Hydrogenation of the propargylsilanes e.g. 5e with Ni(OAc)2/NaBH4 gives the (Z)-allylsilane 6a in 80% yield.