general, and functional group tolerant intramolecular hydroalkoxylation and hydroacyloxylation of unactivated olefins using a Co(salen) complex, an N-fluoropyridinium salt, and a disiloxane reagent is described. This reaction was carried out at room temperature and afforded five- and six-membered oxygen heterocyclic compounds, such as cyclic ethers and lactones. The Co complex was optimized for previously
描述了使用 Co(salen) 配合物、N-氟吡啶鎓盐和二硅氧烷试剂对未活化烯烃进行温和、通用和官能团耐受的分子内加氢烷氧基化和加氢酰氧基化。该反应在室温下进行,得到五元和六元氧杂环化合物,如环醚和内酯。通过未活化烯烃的加氢官能化,Co 配合物针对先前稀有介质环的形成进行了优化。强大的 Co 催化剂体系还可以使 O-保护的链烯醇脱保护加氢烷氧基化和链烯基酯加氢酰氧基化,直接得到环醚和内酯。研究了脱保护的底物范围和机理证明。
On the choice of Lewis acids for the Prins reaction; two total syntheses of (±)-Civet
作者:Freda K. Chio、Julie Warne、Damien Gough、Mark Penny、Sasa Green (née Martinović)、Simon J. Coles、Mike B. Hursthouse、Peter Jones、Lorraine Hassall、Thomas M. McGuire、Adrian P. Dobbs
DOI:10.1016/j.tet.2011.05.019
日期:2011.7
While developing new variations of the Prins cyclisation reaction, the effect of the choice of Lewis acid on the outcome of the reaction and the product(s) has been investigated, yielding hitherto unseen dihydropyran products in the Prins cyclisation reaction of homoallylic alcohols, and two new modifications of the reaction: the triflate-trapped Prins adduct and the Mukaiyama-Aldol-silyl-Prins reaction. Two of these methods are employed in two complementary total syntheses of the important perfumery compound, (+/-)-Civet. (C) 2011 Elsevier Ltd. All rights reserved.