The Z-selective ruthenium-catalyzed addition of aromatic carboxylic acids to alkynes was followed by dioxirane epoxidation to furnish enol ester epoxides with cis configuration. Upon treatment of enol ester epoxides with tert-butyldimethylsilyl triflate in the presence of 2,6-lutidine, synthetically useful alpha-silyloxyaldehydes were obtained. This novel transformation was facilitated by microwave irradiation. (C) 2012 Elsevier Ltd. All rights reserved.
CHEN GuoHongWANG XinJIN XiaoQianLIU LingYanCHANG WeiXing LI Jing State Key Laboratory and Research Institute of Elementoorganic ChemistryNankai UniversityTianjin China
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CHEN GuoHongWANG XinJIN XiaoQianLIU LingYanCHANG WeiXing LI Jing State Key Laboratory and Research Institute of Elementoorganic ChemistryNankai UniversityTianjin China