Indium-trichloride catalyzed Michael reaction of silyl enol ethers with α,β-unsaturated carbonyl compounds under neat condition
作者:Teck-Peng Loh、Lin-Li Wei
DOI:10.1016/s0040-4020(98)00394-9
日期:1998.6
In the presence of a catalytic amount of indium (III) trichloride (InCl3) (20 mol%), ketene silyl enol ethers react quickly with α,β-unsaturated ketones and esters to afford the corresponding Michael adducts in moderate to good yields. Indium(III) trichloride can be recovered and reused without decrease in yields.
Asymmetric total syntheses of (+)-coronafacic acid and (+)-coronatine, phytotoxins isolated from Pseudomonas syringae pathovars
作者:Shinji Nara、Hiroaki Toshima、Akitami Ichihara
DOI:10.1016/s0040-4020(97)00614-5
日期:1997.7
Asymmetric totalsynthesis of (+)-coronafacic acid (2), was accomplished via intramolecular 1, 6-conjugate addition as the key step. The chiral ester (+)-7 was prepared via two approaches: starting from (R)-(+)-4-acetoxy-2-cyclopenten-1-one (12), and using catalytic asymmetric Michael reactions promoted by heterobimetallic BINOL complexes. Coupling between (+)-2 and the protected coronamic acid 8 and subsequent
Expedient synthesis of 3-substituted cycloalkanones via a Pd-catalyzed decarboxylative protonation protocol
作者:Se Hee Kim、Eun Sun Kim、Taek Hyeon Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2009.09.014
日期:2009.11
We developed an efficient method for the introduction of –CH2EWG moiety at the β-position of 2-cycloalken-1-ones via a Pd-catalyzed decarboxylative protonation protocol.
Intramolecular Schmidt reactions of azides with carbocations: synthesis of bridged-bicyclic and fused-bicyclic tertiary amines
作者:William H. Pearson、Rajesh Walavalkar、Jeffrey M. Schkeryantz、Wen Kui Fang、James D. Blickensdorf
DOI:10.1021/ja00075a038
日期:1993.11
Aliphatic azides were captured intramolecularlyby carbocations, producing aminodiazonium ionintermediates. Carbon-to-nitrogen rearrangement then occurred, generating bridged- or fused-bicyclic a-amino carbocations or iminium ions, depending on the geometry about the C(+)-N bond. In the bridged systems, rapid elimination of the α-amino carbocations produced twisted enamines with 1-azabicyclo[3.2.2]nonene
Unique Molecular Discrimination in Europium Complex-Catalyzed Reactions of Saturated and α,β-Unsaturated Ketones with Ketene Silyl Acetals
作者:Kiyoshi Hanyuda、Kei-ichi Hirai、Takeshi Nakai
DOI:10.1055/s-1997-716
日期:——
The unique molecular discriminations are observed in the Eu(III)-catalyzed reactions of saturated ketones, α,β-enones, and α,β-ynones with ketene silyl acetals and discussed in terms of the discriminating ability of the Eu-catalyst at the complexation stage.
在饱和酮、α,β-烯酮和 α,β-炔酮与乙烯酮甲硅烷基缩醛的 Eu(III) 催化反应中观察到独特的分子区分,并根据 Eu 催化剂在络合阶段。