Total synthesis of coriandrin and 7-demethylcoriandrin via a new synthesis of isocoumarins
摘要:
Indenone epoxides 8, prepared from the corresponding indenones, have been shown to undergo clean thermal rearrangement to give isocoumarins 10 in high yields. This synthesis of isocoumarins, when applied to oxaindacenone 7, resulted in the total synthesis of coriandrin (1). (C) 2000 Elsevier Science Ltd. All rights reserved.
Process for the ruthenium-catalysed epoxidation of olefins by means of hydrogen peroxide
申请人:Magerlein Wolfgang
公开号:US20060161011A1
公开(公告)日:2006-07-20
The present invention relates to a process for the epoxidation of olefins using catalysts based on ruthenium complexes in the presence of hydrogen peroxide.
A SIMPLE AND EFFICIENT METHOD FOR THE EPOXIDATION OF α, β-UNSATURATED ALDEHYDES AND KETONES USING AQUEOUS HYDROGEN PEROXIDE-SODIUM ETHOXIDE
作者:A. Patra、M. Bandyopadhyay、S. K. Ghorai、D. Mal
DOI:10.1080/00304940309355863
日期:2003.10
active area of research. While the existing methods serve well the need of synthetic organic chemistry, the yields of the reactions vary widely for different substrates and on many occasions they are abysmally low for multi-step reaction sequences. The work of Wipf et aL8 on the epoxidation of naphthoquinone spiroketals clearly demonstrates that the existing methods based on hydrogen peroxide may lead to
The photochemistry of indenyl alcohols and esters: Substituent effects on the competition between ion- and radical-derived products
作者:J A Pincock、I S Young
DOI:10.1139/v03-131
日期:2003.10.1
The photochemistry of the indenyl acetates 1 and pivalates 2, substituted with X = H, 5-CH3O, and 6-CH3O, have been examined in both methanol and cyclohexane. The precursor alcohols 3 were also found to be photoreactive. Although only radical-derived products were obtained in cyclohexane, both ion- and radical-derived products were formed in methanol. The absence of significant fluorescence emission
Pushing the limits of steric demand around a biaryl axis: synthesis of tetra-ortho-substituted biaryl naphthalenes
作者:Adam C. Glass、Sam Klonoski、Lev N. Zakharov、Shih-Yuan Liu
DOI:10.1039/c0cc02170a
日期:——
The synthesis of tetra-ortho-substituted biaryl naphthalenes, including examples bearing multiple ortho-isopropyl groups, has been developed via a catalytic rearrangement process.
Palladium-Catalyzed Carbonylative Cyclization of 1-Iodo-2-alkenylbenzenes
作者:Ei-ichi Negishi、Christophe Copéret、Shengming Ma、Takeshi Mita、Takumichi Sugihara、James M. Tour
DOI:10.1021/ja9533196
日期:1996.1.1
6-membered Type I cyclic acylpalladation products, i.e., α,β-unsaturated cyclicketones, in the absence of an external nucleophile and high yields of 5- and 6-membered Type IIcyclic acylpalladation products, i.e., α- or β-((alkoxycarbonyl)methyl)substituted cyclicketones in the presence of an alcohol, e.g., MeOH. In cases where no such processes are available, other side reactions, such as cyclic carbopalladation