Addition reaction of arylboronic acids to aldehydes and α,β-unsaturated carbonyl compounds catalyzed by conventional palladium complexes in the presence of chloroform
作者:Tetsuya Yamamoto、Michiko Iizuka、Hiroto Takenaka、Tetsuo Ohta、Yoshihiko Ito
DOI:10.1016/j.jorganchem.2008.12.032
日期:2009.4
Arylboronic acids react with aldehydes and α,β-unsaturatedcarbonylcompounds in the presence of a base and a catalytic amount of a palladium(0) complex with chloroform, affording the corresponding addition products in good yields, and chiral benzhydrol was obtained with up to 43% e.e. using (S,S)-bppm as a ligand. General palladium complexes have no catalytic activity without chloroform. Because chloroform
CuX<sub>3</sub>Li<sub>2</sub>-catalysed conjugate addition of dialkylmagnesium reagents to α,β-unsaturated carbonyl compounds
作者:Manfred T. Reetz、Alois Kindler
DOI:10.1039/c39940002509
日期:——
Copper salts of the type CuX3Li2(X = halogen) catalyse the conjugate addition of dialkylmagnesiumcompounds to α,β-unsaturated carbonyl compounds in the presence or absence of Me3SiCl as an additive, the organomagnesium compounds being prepared from α-olefins, hydrogen and magnesium according to the procedure of Bogdanović.
在存在或不存在作为添加剂的Me 3 SiCl的情况下,CuX 3 Li 2类型的铜盐(X =卤素)催化二烷基镁化合物共轭加成到α,β-不饱和羰基化合物上,有机镁化合物由α-根据Bogdanović的程序制备烯烃,氢和镁。
Friedel–Crafts reactions of n-alkenoic acids and ω-chloroalkanoic acids
作者:M. F. Ansell、G. F. Whitfield
DOI:10.1039/j39710001098
日期:——
The Friedel–Craftsreactions between benzene and pent-2-enoic, pent-3-enoic, pent-4-enoic, 5-chloropentanoic, non-2-enoic, non-8-enoic, and 9-chlorononanoic acid are reported. The nature of the products obtained in the reactions of the alkenoic acids were shown to be dependent on the initial position of the double bond. A rationalisation of these observations is presented. New syntheses of non-8-enoic
Regiospecific addition of organocopper reagents to α, gb-unsaturated esters
作者:Mohammad Behforouz、Timothy T Curran、Joseph L Bolan
DOI:10.1016/s0040-4039(00)84727-9
日期:——
Mixed cuprates ArSCu(RMgX)n add rapidly to crotonates and cinnamates to give high yields of Michael adducts. Cuprates of methyl, ethyl, isopropyl, -butyl, phenyl and vinyl were used. Crotonates give much higher yields of adducts with cuprates using 2-methoxythiophenoxide as a ligand than with those using thiophenoxide.
The benzene ring as an optically active chromophore—II
作者:L. Verbit、S. Mitsui、Y. Senda
DOI:10.1016/0040-4020(66)80046-7
日期:1966.1
The optical rotatory dispersion (ORD) of several open chain compounds contaning the benzenechromophore at the asymmetric center has been measured in the UV spectral region. The Cotton effects in the aromatic absorption regions of (−)-methyl 3-hydroxy-3-phenyl-butyrate, (+)-methyl 4-hydroxyl-4-phenylvalerate, (−)-methyl 3-phenylvalerate, and (+)-methyl 3-hydroxy-3-phenylvalerate were too weak to be