high diastereo- and enantioselectivities. Mechanistic investigation suggested that the reactions involve a [4 + 2] cycloaddition pathway, in which the enamine of the enone acts as the diene and the ketone carbonyl group of the aryl trifluoromethyl ketone acts as the dienophile. In this study, tetrahydropyran derivatives with the desired stereochemistry that are difficult to synthesize by previously reported
四氢吡喃衍
生物存在于
生物活性物质中,将三
氟甲基基团引入分子中通常会改善
生物功能。在这里,我们报告了由胺基催化剂体系催化的非对映和对映选择性氧杂-杂-Diels-Alder 反应,该催化剂体系提供三
氟甲基取代的
四氢吡喃酮。确定了适用于反应的催化剂体系和条件,以提供具有高对映选择性的所需非对映体产物,并合成了各种具有高非对映选择性和对映选择性的三
氟甲基取代的
四氢吡喃酮。机理研究表明,该反应涉及[4 + 2]环加成途径,其中烯酮的烯胺充当二烯,芳基三
氟甲基酮的酮羰基充当亲二烯体。在这项研究中,