Aqueous Wittig reactions of semi-stabilized ylides. A straightforward synthesis of 1,3-dienes and 1,3,5-trienes
作者:James McNulty、Priyabrata Das
DOI:10.1016/j.tetlet.2009.07.133
日期:2009.10
A direct synthesis of 1,3-dienes and 1,3,5-trienes from the reaction of semi-stabilized ylides and a range of saturated and unsaturated aldehydes is reported in water as solvent, employing sodium hydroxide as base. The water-soluble phosphine oxide side product is removed simply by aqueous partitioning of the organic products.
for the E isomer (E/Z ratios ranging from 90:10 to 97:3). The olefination reactions of aldehydes with dissymmetric arsonium halides (R not equal R') are very chemoselective; with arsonium ylide anions the benzyl moiety is more reactive than the allyl moiety which is much more reactive than prenyl and methyl groups. Based on the experimental results, a mechanism is proposed for the reaction.
Solvent Effect in the Wittig Reaction Under Boden's Conditions
作者:Enrique M. Pandolfi、Gloria V. López、Eduardo Días、Gustavo A. Seoane
DOI:10.1081/scc-120021496
日期:2003.1.7
Abstract An interesting change in the stereochemical outcome of the Wittigolefination reaction under Boden's conditions (potassium bases and 18-crown-6 as the ylide forming reagent) is reported. This effect depends significantly on the polarity of the solvents and the nature of the ylide.
HAKIKI, ABDELHAK;RIPOLL, J. -L.;THUILLIER, A., BULL. SOC. CHIM. FR., 1985, N 5, 911-920
作者:HAKIKI, ABDELHAK、RIPOLL, J. -L.、THUILLIER, A.
DOI:——
日期:——
TBAI-Catalyzed Regioselective Hydroxyperoxidation of 1-Aryl/Alkyl-1,3-dienes
作者:Atul Kumar、Gulenur N. Khatun、Rodney A. Fernandes
DOI:10.1021/acs.orglett.3c01393
日期:2023.6.16
approach for regioselective synthesis of 4-aryl/alkyl-1-peroxy-but-3-en-2-ols from 1-substituted-1,3-butadienes using hydroperoxides and catalyzed by TBAI has been developed. This method can be executed in a simple operation with no dry conditions required and having tolerance to a wide range of substrates to access corresponding hydroxyperoxidates in good yields. Thus, an excellent regioselective orthogonal