Nickel-Promoted Carboxylation/Cyclization Cascade of Allenyl Aldehyde under an Atmosphere of CO2
作者:Yoshihiro Sato、Masanori Takimoto、Mitsunobu Kawamura、Miwako Mori
DOI:10.1055/s-0030-1260565
日期:2011.6
In the presence of a stoichiometric amount of Ni(0) complex, allenyl aldehydes smoothly reacted with carbon dioxide at an ambient temperature and pressure in a regioselective manner. The reaction involves an intramolecular cyclization of aldehyde and allene moieties to afford cyclic carboxylic acid derivatives having a hydroxyl group.
Highly efficient [2 + 2] intramolecular cyclizations of allenynes under microwave irradiation: construction of fused bicyclic compounds
作者:Chang Ho Oh、Arun Kumar Gupta、Dai In Park、Nakjoong Kim
DOI:10.1039/b508306k
日期:——
A palladium [2 + 2] cycloaddition of 1,6- and 1,7-allenyne carboxylates and microwave-mediated [2 + 2] cycloaddition of various 1,n-allenynes were developed and, particularly, the microwave irradiated [2 + 2] cycloaddition of allenynes can provide a simple, general and eco-friendly synthetic method to fused bicyclo[m,2,0]alkadienes.
Access to Functionalized <i>E</i>-Allylsilanes and <i>E</i>-Alkenylsilanes through Visible-Light-Driven Radical Hydrosilylation of Mono- and Disubstituted Allenes
作者:Yanyao Cai、Wenxuan Zhao、Shaozhong Wang、Yong Liang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.9b03679
日期:2019.12.20
visible-light-driven radical hydrosilylation of allene has been achieved by using eosin Y as the photocatalyst, with thiol and base as additives. Depending on allenes, two types of adducts with E-selectivity were obtained. It was demonstrated that monosubstituted nonarylated allenes reacted to give linear E-allylsilanes, while 1,3-disubstituted electron-deficient allenes afforded E-alkenylsilanes. A radical mechanism
An expedient stereoselective route to the ACE tricyclic core of manzamine A via a palladium-catalysed arylative allene spirocyclisation cascade
作者:Alison Hawkins、Pavol Jakubec、Alan Ironmonger、Darren J. Dixon
DOI:10.1016/j.tetlet.2012.10.111
日期:2013.1
Application of a novel palladium-catalysed stereoselective arylative allene spirocyclisation cascade as the key step for the construction of the ACE tricycliccore of manzamine A is described.
Annelative ring expansion via intramolecular [2 + 2] photocycloaddition of .alpha.,.beta.-unsaturated .gamma.-lactones and reductive cleavage: synthesis of hydrocyclopentacyclooctene-5-carboxylates
作者:Robert M. Coates、Peter D. Senter、William R. Baker