Hypervalent iodine initiated intramolecular alkene dimerisation: a stereodivergent entry to cyclobutanes
作者:Yuxiang Zhu、Ignacio Colomer、Timothy J. Donohoe
DOI:10.1039/c9cc04383g
日期:——
The emergence of newmethods for the stereoselectivesynthesis of strained carbocycles is a challenging but worthwhile endeavour. Cyclobutanes, in particular, have attracted the attention of both medicinal chemists and material scientists for their unique properties. Herein, we present a newmethod that allows access to highly functionalized cyclobutanes with complementary all-trans and trans–cis–trans
Visible-Light [4+2] Homodimerization of Decomposition-Prone Styrenes via Electron Transfer Catalysis of Diaryl Diselenides
作者:Inho Jang、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.4c01210
日期:2024.5.10
The facile electron transfer catalysis of diaryl diselenides was utilized for the visible-light [4+2] homodimerization of decomposition-prone styrenes. The reaction required only 0.5 mol % TPT+BF4– photocatalyst and 1.5 mol % electron transfer catalyst (ArSe)2. The spontaneous electron transfer capability of diaryl diselenides was demonstrated for the first time, leading to the sequestration of redox-prone
作者:Jonathan D. Parrish、Michael A. Ischay、Zhan Lu、Song Guo、Noël R. Peters、Tehshik P. Yoon
DOI:10.1021/ol300428q
日期:2012.3.16
Structurally novel endoperoxides can be sythesized by the photocatalytic cyclotrimerization of bis(styrene) substrates with molecular oxygen. The optimal catalyst for this process is Ru(bpz)(3)(2+), which is a markedly more efficient catalyst for these photooxygention reactions than conventional organic photosensitizers. The 1,2-dioxolane products are amenable to synthetic manipulation and can be easily processed to 1,4-diols and gamma-hydroxyketones. An initial screen of the biological activity of these compounds reveals promising inhibition of cancer cell growth.