The Fate of Bis(η3-allyl)palladium Complexes in the Presence of Aldehydes (or Imines) and Allylic Chlorides: Stille Coupling versus Allylation of Aldehydes (or Imines)
摘要:
The mere presence or absence of PPh3 suffices to control the reactivity of bis(η3 -allyl)palladium complexes. In the absence of PPh3 they undergo chemoselective allylic addition to aldehydes or imines, even in the presence of allylic chlorides, whereas in the presence of PPh3 the Stille coupling reaction takes place chemoselectively, even when aldehydes or imines are also present.
A Simplified Wittig Synthesis Using a Solid/Liquid Transfer Process. IX. Selectivity of the Condensation Reaction of Moderated Ylides with Aldehydes
作者:T. Ben Attra、Y. Le Bigot、R. El Gharbi、M. Delmas、A. Gaset
DOI:10.1080/00397919208021608
日期:1992.5
Abstract Conjugated dienes are obtained selectively and with high yields using aldehydes of various structures. The synthesis is made in a two-phase medium, i.e solid/liquid medium.
摘要 使用各种结构的醛可以选择性地以高产率获得共轭二烯。合成是在两相介质中进行的,即固/液介质。
New and highly (E)-selective synthesis of terminal 1,3-diene via three-carbon elongation of aldehyde
作者:Hideki Maeta、Keisuke Suzuki
DOI:10.1016/s0040-4039(00)61102-4
日期:1992.9
A new synthetic method of 1,3-diene by three-carbon elongation of aldehyde is described. 3-Trimethylsilyl-1-propenylzirconocene chloride (2), generated from 3-trimethylsilyl-1-propyne (1) and Cp2Zr(H)Cl, reacts with aldehyde in the presence of catalytic AgClO4 and subsequent one-pot 1,4-elimination affords 1,3-dienes in high yields with excellent (E)-selectivities.
The synthesis of alkenes from carbonyl compounds and carbanions α to silicon. VIII: Regioselectivity in the reactions of 2-trimethylsilylallyl carbanion and the synthesis of 1,3-dienes.
作者:P.W.K. Lau、T.H. Chan
DOI:10.1016/s0040-4039(01)94780-x
日期:——
The Fate of Bis(η3-allyl)palladium Complexes in the Presence of Aldehydes (or Imines) and Allylic Chlorides: Stille Coupling versus Allylation of Aldehydes (or Imines)
The mere presence or absence of PPh3 suffices to control the reactivity of bis(η3 -allyl)palladium complexes. In the absence of PPh3 they undergo chemoselective allylic addition to aldehydes or imines, even in the presence of allylic chlorides, whereas in the presence of PPh3 the Stille coupling reaction takes place chemoselectively, even when aldehydes or imines are also present.