The marine natural product amphidinolide J has been synthesized according to a convergent strategy. The key steps of this synthesis include a B-alkyl Suzuki-Miyaura coupling and the addition of an alkynyllithium reagent to a Weinreb amide to build the C4-C5 and C12-C13 bonds, respectively, and a Yamaguchi macrolactonization.
Efficient methods for the preparation of acetylenic ketones
作者:H.D. Verkruijsse、Y.A. Heus-Kloos、L. Brandsma
DOI:10.1016/0022-328x(88)80002-0
日期:1988.1
A number of acetylenicketones RCCC(O)R′ have been obtained in good yields from lithiated acetylenes RCCLi and acetic anhydride, N,N-dimethylacetamide, or N,N-dimethylbenzamide. The most convenient and general method consists of treating alkynylzinc chlorides with acid halides R′C(O)Cl. Benzoyl chloride (R′ = Ph), acryloyl chloride (R′ = CH2CH), and butynoyl chloride (R′ = C2H5CC) react only
从锂化乙炔RC CLi和乙酸酐,N,N-二甲基乙酰胺或N,N-二甲基苯甲酰胺以良好的产率获得了许多炔酮RC = CC(= O)R′ 。最方便,最通用的方法是用酰基卤R'C(= O)Cl处理炔基氯化锌。苯甲酰氯(R'= Ph),丙烯酰氯(R'= CH 2 = CH )和丁酰氯(R'= C 2 H 5 C = C )仅在催化量的Pd [P(P( Ph)3 ] 4。
Metal Cation-Exchanged Montmorillonite (M<sup><i>n</i>+</sup>-Mont)-Catalyzed Friedel–Crafts Acylation of 1-Methyl-1-cyclohexene and 1-Trimethylsilyl-1-alkynes
The acylation of 1-methyl-1-cyclohexene and 1-trimethylsilyl-1-alkynes with acyl chlorides has been investigated in the presence of a variety of metal cation-exchanged montmorillonites (abbreviated as Mn+-monts), where the catalysts are recyclable for several times after simple washing.
A Novel Cu-Assisted Cycloisomerization of Alkynyl Imines: Efficient Synthesis of Pyrroles and Pyrrole-Containing Heterocycles
作者:Alexander V. Kel'in、Anna W. Sromek、Vladimir Gevorgyan
DOI:10.1021/ja0058684
日期:2001.3.1
Palladium(II)-Catalyzed Three-Component Coupling Reaction Initiated by Acetoxypalladation of Alkynes: An Efficient Route to γ,δ-Unsaturated Carbonyls
作者:Ligang Zhao、Xiyan Lu
DOI:10.1021/ol026741h
日期:2002.10.1
[GRAPHICS]A divalent palladium-catalyzed coupling reaction of electron-deficient alkynes and acrolein or MVK (methyl vinyl ketone) was developed. The reaction provides an efficient method to synthesize gamma,delta-unsaturated carbonyls. A mechanism involving acetoxypalladation of alkyne, followed by insertion of alkene and protonolysis of the C-Pd bond, is proposed. The protonolysis of the carbon-palladium bond with the assistance of bidentate nitrogen containing ligands is the key step in this tandem reaction.
Moody, Christopher J.; Shah, Pritom, Journal of the Chemical Society. Perkin transactions I, 1988, p. 1407 - 1416