Polymer-supported selenium-induced electrophilic cyclization: solid-phase synthesis of poly-substituted dihydrofurans and tetrahydrofurans
摘要:
Poly-substituted dihydrofurans and tetrahydrofurans have been synthesized through polymer-supported selenium-induced intramolecular electrophilic cyclization, followed by selenoxide syn-elimination or novel nucleophilic substitution cleavage of selenium resin with good yields and purities. (C) 2004 Elsevier Ltd. All rights reserved.
a variety of alcohols with anilines, because the unique acidity of the H-mont catalyst effectively prevents the neutralization by the basic anilines. In addition, amides, indoles, 1,3-dicarbonyl compounds, and allylsilane act as nucleophiles for the H-mont-catalyzed substitutions of alcohols, which allowed efficient formation of various C−N and C−C bonds. The solid H-mont was reusable without any appreciable
Synthesis of Cyclic Enol Ethers from Alkenyl-β-dicarbonyl Compounds
作者:Helena M. C. Ferraz、Myrian K. Sano、Marta R. S. Nunes、Graziela G. Bianco
DOI:10.1021/jo011089+
日期:2002.6.1
the cyclofunctionalization of eleven differently substituted alkenyl-beta-dicarbonyl compounds, employing three electrophilic reagents, namely, iodine, p-methoxyphenyltellurium trichloride, and phenylselenenyl bromide. The reactions occur through the enolic form of the substrates, to afford the corresponding iodo-, telluro-, or selenocyclic enolethers. Substrates bearing trisubstituted double bonds
Tellurium and Iodine Promoted Cyclofunctionalization of Alkenyl Substituted β-Keto Esters
作者:H. M. C. Ferraz、M. K. Sano、A. C. Scalfo
DOI:10.1055/s-1999-2679
日期:1999.5
This work describes the use of aryltellurium trichloride and iodine as suitable cyclization reagents for alkenyl substituted β-keto esters. The reaction takes place via the enolic form of the dicarbonyl compounds, giving the corresponding five-membered cyclic ethers in good yields.
Alkylation of β-dicarbonyl compounds with 1,2-dibromocyclohexane
作者:N. S. Sadykhov、Sh. S. Nasibov、F. M. Muradova、R. A. Gasymov
DOI:10.1007/bf02498956
日期:1998.2
Alkylation of acetylacetone, ethyl acetoacetate, and diethyl malonate with 1,2-dibromocyclohexane in the presence of K2CO3 in DMSO occurs only asC-alkylation accompanied by dehydrobromination, whereas a similar reaction of dimedone follows bothC- andO-alkylation pathways.
A compound reprsented by the following formula (I), its salts or nsolvates thereof capable of specifically or selectively expressig an antifungal activity in a broad spectrum based on the novel mechanism thereof of 1,6-β-glucan synthesis inhibition, and an antifungal agent containing any of them.