Dithioacetal as a 1,1-zwitterion synthon. Synthesis of functionalized alkenes by the coupling of benzylic dithioacetals with another 1,1-zwitterion synthon
作者:Hai-Yang Tu、Yi-Hung Liu、Yu Wang、Tien-Yau Luh
DOI:10.1016/j.tetlet.2004.12.016
日期:2005.1
Reaction of a dithioacetal sequentially with BuLi and alkyl bromide having an electron withdrawing substituent at the α-position followed by treatment with neutral alumina gives the corresponding olefination product in moderate to good yields.
β-Elimination of the isonitrile group in alkylation reactions of C–H acids activated by the isonitrile function
作者:Mikołaj Jawdosiuk、Maciej Umiński
DOI:10.1039/c39820000979
日期:——
During phase-transfer alkylation of the isonitriles R1R2CHNC with X–CH2–Y, where X is a leaving group and Y an electron withdrawing group, some of the alkylation products undergo β-elimination of the isonitrilefunction to yield R1R2CCHY.
在异氰酸酯R 1 R 2 CHNC用X–CH 2 –Y进行相转移烷基化的过程中,其中X是一个离去基团,Y是一个吸电子基团,一些烷基化产物会经历β-消除的异腈官能团,从而生成R 1 R 2 C CHY。
Palladium-Catalyzed Synthesis of 9-Fluorenylidenes through Aryne Annulation
作者:Shilpa A. Worlikar、Richard C. Larock
DOI:10.1021/ol900554r
日期:2009.6.4
The palladium-catalyzedannulation of arynes by substituted o-halostyrenes produces substituted 9-fluorenylidenes in good yields. This methodology provides this important carbocyclic ring system in a single step, which involves the generation of two new carbon−carbon bonds, occurs under relatively mild reaction conditions, and tolerates a variety of functional groups, including cyano, ester, aldehyde
9-Phenethylfluorene, 9-phenylethylidenefluorene, β-9-fluorenylstyrene, and spiro-1-(9-fluorenyl)-2-phenyl-cyclopropane have been synthesised and their structure established. Certain erroneous statements about 2-(9-fluorenyl)-1,1-diphenylethene and 2-fluorenylidene-1,1-diphenylethane have been corrected and the isomerisation of these substances compared with that of 9-phenylethylidenefluorene and β-9-fluorenylstyrene
An efficient one-pot synthesis of spiro dihydrofuran fluorene and spiro 2-hydroxytetrahydrofuran fluorene derivatives via [3+2] oxidative cycloaddition mediated by CAN
作者:G. Savitha、R. Sudhakar、P.T. Perumal
DOI:10.1016/j.tetlet.2008.10.011
日期:2008.12
dihydrofuran fluorene derivatives were prepared via [3+2] oxidative cycloaddition of 1,3-dicarbonyl compounds to 9-benzylidene-9H-fluorene and 2-(9H-fluorene-9-ylidene)-1-phenylethanone derivatives mediated by ceric ammonium nitrate. In the case of the reaction of 9-benzylidene-9H-fluorene with acyclic 1,3-dicarbonyl compounds, spiro 2-hydroxytetrahydrofuran fluorene derivatives were obtained.