Development of a Robust and Practical Process for the Darzens Condensation and α,β-Epoxide Rearrangement: Scope and Limitations of the Methodology
作者:Fabrice Gallou、Jeremy Zimbron、Manuela Seeger-Weibel、Hans Hirt
DOI:10.1055/s-2008-1067002
日期:2008.4
benzaldehydes and subsequent α,β-epoxy rearrangement is reported. The process developed is both amenable to large scale and parallel synthesis. While electron-poor benzaldehydes gave mixtures of aryl ketones and 2-substituted aryl ketones in mediocre to low yields, electron-rich benzaldehydes were found to react in high yields with complete regioselectivity to form 2-substituted aryl ketones.
报道了取代苯甲醛的 Darzens 缩合和随后的 α,β-环氧重排的实用且稳健的过程。所开发的工艺既适用于大规模合成,也适用于平行合成。虽然贫电子苯甲醛以中等至低产率产生芳基酮和 2-取代芳基酮的混合物,但发现富电子苯甲醛以高产率反应形成 2-取代芳基酮,具有完全的区域选择性。