Iron-Catalyzed Contrasteric Functionalization of Allenic C(sp<sup>2</sup>)–H Bonds: Synthesis of α-Aminoalkyl 1,1-Disubstituted Allenes
作者:Yidong Wang、Sarah G. Scrivener、Xiao-Dong Zuo、Ruihan Wang、Philip N. Palermo、Ethan Murphy、Austin C. Durham、Yi-Ming Wang
DOI:10.1021/jacs.1c07512
日期:2021.9.22
An iron-catalyzed C–H functionalization of simple monosubstituted allenes is reported. An efficient protocol for this process was made possible by the use of a newly developed electron-rich and sterically hindered cationic cyclopentadienyliron dicarbonyl complex as the catalyst and N-sulfonyl hemiaminal ether reagents as precursors to iminium ion electrophiles. Under optimized conditions, the use of
The process for the preparation of a selectively substituted cyclopentadiene compound which includes reacting a halide of a substituting compound in a mixture of the cyclopentadiene compound and an aqueous solution of a base in the presence of a phase transfer catalyst, wherein during the reaction the quantity of base relative to the cyclopentadiene compound may at any moment be between 5 and 30 mol/mol.
Reactions of Substituted (1,3-Butadiene-1,4-diyl)magnesium, 1,4-Bis(bromomagnesio)butadienes and 1,4-Dilithiobutadienes with Ketones, Aldehydes and PhNO To Yield Cyclopentadiene Derivatives and N-Ph Pyrroles by Cyclodialkenylation
作者:Hongyun Fang、Guotao Li、Guoliang Mao、Zhenfeng Xi
DOI:10.1002/chem.200400025
日期:2004.7.19
4-Dilithiobutadiene derivatives 1, 1,4-bis(bromomagnesio)butadienederivatives 2 and metallacyclic (1,3-butadiene-1,4-diyl)magnesium reagents 3 were prepared and their reactions with ketones, aldehydes, and PhNO were investigated. Multiply substitutedcyclopentadienes and N-Phpyrroles were formed by unprecedented reaction conditions. The carbonyl group of aldehydes and ketones was deoxygenated during
[Ru(η5-C5Me4R)(MeCN)3][PF6] (R = CH2tBu, iPr, tBu, and CF3; 2–5) complexes were synthesized in two steps starting from the appropriate cyclopentadienes and RuCl3·3H2O. The fully substituted ruthenocenes [Ru(C5Me5)(C5Me4R*)], [Ru(C5Me5)(C5nPr4R*)] R* = (1R,5S)-6,6-dimethylbicyclo[3.1.1]hept-2-en-2-yl} and [Ru(C5Me5)(C5nPr5)] were obtained by treating [Ru(C5Me5)Cl]4 with the corresponding cyclopentadienyllithium
Reaction of 4-methyl, 4-phenyl, and 4-hydrogen substituted 1-lithio-1,3-butadienes with aldehydes: preparation of multiply substituted cyclopentadienes
作者:Zhihui Wang、Hongyun Fang、Zhenfeng Xi
DOI:10.1016/j.tet.2006.04.083
日期:2006.7
acidic solution. Reaction mechanism study revealed that these cyclopentadienes were formed via an acid-promoted cyclization of conjugated dienols. Thus, stereodefined all-cis substituted dienols or a wide diversity of substituted cyclopentadienes can be obtained from the same 1-lithio-1,3-butadiene reagent and aldehyde by adjusting the hydrolysis conditions.