Enantioselective Synthesis of 3,5,6‐Substituted Dihydropyranones and Dihydropyridinones using Isothiourea‐Mediated Catalysis
作者:Daniel G. Stark、Louis C. Morrill、David B. Cordes、Alexandra M. Z. Slawin、Timothy J. C. O'Riordan、Andrew D. Smith
DOI:10.1002/asia.201500907
日期:2016.2
isothiourea-catalyzed processes has been expanded and explored through the use of 2-N-tosyliminoacrylates and 2-aroylacrylates in a Michael addition-lactonization/lactamization cascade reaction. Notably, to ensure reproducibility it is essential to use homoanhydrides as ammonium enolate precursors with 2-aroyl acrylates, while carboxylic acids can be used with 2-N-tosyliminoacrylates, delivering a range of 3,5,6-substituted
通过在迈克尔加成-内酯化/内酰胺化级联反应中使用 2-N-甲苯磺酰亚氨基丙烯酸酯和 2-芳酰基丙烯酸酯,可通过异硫脲催化工艺获得的二氢吡喃酮和二氢吡啶酮产品的范围得到了扩展和探索。值得注意的是,为确保重现性,必须使用高酸酐作为烯醇铵前体与 2-芳酰基丙烯酸酯,而羧酸可与 2-N-甲苯亚氨基丙烯酸酯一起使用,从而提供一系列 3,5,6-取代的二氢吡喃酮和二氢吡啶酮,具有高对映选择性(通常 > 90 % ee)。还报道了通过氢化对 3,5,6-取代的二氢吡喃酮的杂环核心进行衍生化。