Synthesis of 2-Alkenyl-3-(alkoxycarbonyl)furans Based on Feist−Benary Cyclocondensation of (2,4-Dioxobutylidene)phosphoranes with α-Haloketones and α-Chloracetaldehyde
摘要:
3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene) phosphoranes with chloracetaldehyde and alpha-haloketones and subsequent Wittig reactions.
Synthesis of 2-Alkenyl-3-alkoxycarbonylfurans by ‘Feist-Benary-Cyclocondensation’ of (2,4-Dioxobutylidene)phosphoranes with Chloroacetaldehyde and Subsequent Wittig Reactions
作者:Peter Langer、Edith Holtz
DOI:10.1055/s-2004-829560
日期:——
Functionalized furans were prepared by 'Feist-Benary-cyclocondensation' of (2,4-dioxobutylidene)phosphoranes with chloroacetaldehyde and subsequent Wittig reactions.
Synthesis of 4,5-Benzotropones by Cyclization of 1,3-Bis-Silyl Enol Ethers with 1,2-Dialdehydes
作者:Uwe Albrecht、Thi Hong Van Nguyen、Peter Langer
DOI:10.1021/jo049736v
日期:2004.5.1
The cyclization of 1,3-bis-silylenolethers or (2,4-dioxobutylidene)triphenylphosphoranes with phthalic dialdehyde allowed a convenient synthesis of a variety of 4,5-benzotropones. The hydrogenation of benzotropones afforded functionalized benzocycloheptanones which were transformed into tricyclic butenolides.
One-pot reactions of 2,4-(dioxobutylidene)phosphoranes. Efficient synthesis of 4-(2-hydroxybenzoyl)salicylic acid derivatives and buta-1,3-diene-1,4-dicarboxylates
作者:Edith Holtz、Uwe Albrecht、Peter Langer
DOI:10.1016/j.tet.2007.02.062
日期:2007.4
4-(2-Hydroxybenzoyl)salicylic esters and amides were prepared by domino 'Michael-Retro-Michael-Wittig' reactions of (2,4-dioxobutylidene)triphenylphosphoranes with 3-formylchromones.