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.
[2+2] Cycloadditions by Oxidative Visible Light Photocatalysis
作者:Michael A. Ischay、Zhan Lu、Tehshik P. Yoon
DOI:10.1021/ja103934y
日期:2010.6.30
cyclobutanes and other strained ring systems that are difficult to construct using other conventional synthetic methods. We have previously shown that Ru(bpy)(3)(2+) is an efficient photocatalyst that promotes the [2+2] cycloadditions of electron-deficient olefins with visible light. Here, we show that Ru(bpy)(3)(2+) is also an effective photocatalyst for the [2+2] cycloaddition of electron-rich olefins