1-Sulfonyl-1,2,3-triazoles, readily prepared from terminal alkynes and sulfonylazides, react with allenes in the presence of a nickel(0) catalyst to produce the corresponding isopyrroles. The initially produced isopyrroles are further converted to a wide range of polysubstituted pyrroles through double bond transposition and Alder-ene reactions.
Allene Epoxidation. Highly functionalized tetrahydrofurans and tetrahydropyrans from the oxidative cyclization of allenic alcohols.
作者:Jack K. Crandall、David J. Batal、Feng Lin、Thierry Reix、Gregory S. Nadol、Raymond A. Ng
DOI:10.1016/s0040-4020(01)92232-x
日期:1992.2
The dimethyldioxirane oxidation of various allenic alcohols yields highlyfunctionalizedtetrahydrofuran and tetrahydropyran derivatives via intramolecular nucleophilic addition of the hydroxy group to an intermediate allene diepoxide.
Chromium‐Catalyzed Selective Dimerization/Hydroboration of Allenes to Access Boryl‐Functionalized Skipped (
<i>E</i>
,
<i>Z</i>
)‐Dienes
作者:Yinsong Zhao、Shaozhong Ge
DOI:10.1002/anie.202012344
日期:2021.1.25
dimerization/hydroboration of allenes is developed to access synthetically versatile boryl‐functionalized skippeddienes with a catalyst generated in situ from CrCl2 and a pyridine‐2,6‐diimine ligand mesPDI. A variety of allenes reacted with pinacolborane (HBpin) to afford the corresponding boryl‐functionalized (E,Z)‐1,4‐dienes in high yields and with excellent selectivity. Electron paramagnetic resonance (EPR) spectroscopic
Counterions in control: The rhodium(I)‐catalyzed coupling of one molecule of aldehyde and two molecules of allene gave β,γ‐dialkylidene ketones (see scheme). Either of two constitutional isomers was selectively obtained depending on the counterion of the rhodium(I) complex.
Enantioselective [2 + 2 + 2] Cycloaddition Reaction of Isocyanates and Allenes Catalyzed by Nickel
作者:Tomoya Miura、Masao Morimoto、Masahiro Murakami
DOI:10.1021/ja105541r
日期:2010.11.17
The enantioselective intermolecular [2 + 2 + 2] cycloaddition reaction of two molecules of isocyanate and one molecule of allene is catalyzed by a nickel(0)/(S,S)-i-Pr-FOXAP complex, providing an efficient access to enantiomerically enriched dihydropyrimidine-2,4-diones.