Development of a Method for the Synthesis of a-Substituted a,b-Unsaturated Lactones Based on Stille-Type Pd-catalyzed Carbonylation of (Z)-w-Iodoalkenols. An Efficient and Selective Synthesis of (+)-Hamabiwa-lactone B
Highly functionalized α-2,3-methanoamino acid esters were prepared by the cyclopropanation of dehydroaspartic acid esters with 2-methoxyfuran or 2-siloxyfuran derivatives. These reactions proceed smoothly in the absence of any catalysts, bases, additives, or solvents.
The bioinspired design of a reagent allows the functionalization of C<sub>α</sub>–H of α,β-unsaturated carbonyl compounds via the Baylis–Hillman chemistry under ambient conditions
A rationally designed reagent capable to affect alkylation at C[small alpha] of [small alpha], [small beta]-unsaturated carbonylcompounds is reported. The reaction proceeded at room temperature without any additives. The pH and H-Bond...
Synthesis of substituted 3-furan-2(5H)-ones via an anthracene Diels–Alder sequence
作者:Simon Jones、Ian Wilson
DOI:10.1016/j.tetlet.2006.04.097
日期:2006.6
Deprotonation then electrophilic quench of the lactone derived from the Diels–Alder addition adduct of anthracene and maleicanhydride gave α-substituted lactones in good yield. Of particular note was the reaction with chlorotrimethylsilane which gave only the C-silylated product. Flash vacuum pyrolysis (FVP) of the alkylated products afforded 3-substituted furan-2(5H)-ones in good overall yield.
Efficient Synthesis of α-Allylbutenolides from Allyl Ynoates via Tandem Ligand-Enabled Au(I) Catalysis and the Claisen Rearrangement
作者:Huiyan Wang、Ting Li、Zhitong Zheng、Liming Zhang
DOI:10.1021/acscatal.9b03501
日期:2019.11.1
A facile construction of α-allylbutenolides from readily available allyl ynoates has been developed viatandem gold-catalyzed alkyne isomerization to allene and cycloisomerization, the Claisen rearrangement and a double bond migration. The gold catalysis is enabled by a bifunctional phosphine ligand featuring a critical remote tertiary amino group, and the reaction tolerates a range of substituents
Verfahren zur Herstellung von 3-Alkyl-2,5-dihydrofuran-2-onen
申请人:BASF Aktiengesellschaft
公开号:EP0090231A1
公开(公告)日:1983-10-05
Verfahren zur Herstellung von 3-Alkyl-2,5-dihydrofuran-2-onen der Formel
in der R' für einen Alkylrest steht, durch Behandlung von Butenderivaten der Formeln
oder
in denen R' einen Alkylrest und R2 einen Acyloxyrest oder Alkoxyrest bedeutet, wobei zwei Reste R2 am gleichen C-Atom auch ein Sauerstoffatom oder einen -O-(CH2)x-O-Rest mit x = 2 oder 3 bedeuten können, mit sauer wirkenden Mitteln.