Synthesis of Aminoindolizidines through the Chemoselective and Diastereoselective Catalytic Hydrogenation of Indolizines
作者:María José Albaladejo、María José González-Soria、Francisco Alonso
DOI:10.1021/acs.joc.6b01782
日期:2016.10.21
synthesis of indolizines followed by heterogeneous catalytic hydrogenation. The latter was found to be chemoselective using platinum(IV) oxide as the catalyst at 3.7 atm, providing the aminoindolizidines in modest-to-high yields (35–95%) and high diastereoselectivity (92:8 to >99:1). It has been experimentally demonstrated that the hydrogenation occurs through the intermediate 5,6,7,8-tetrahydroindolizine
吲哚并咪唑是具有巨大潜力的生物活性杂环化合物,通常按照多步路线制备。然而,据我们所知,从未报道过1-氨基吲哚并核苷的合成。在本文中,已经使用原子经济方案直接合成了1-(二烷基氨基)-3-取代的吲哚并啶,该方案涉及铜催化的吲哚嗪的三组分合成,然后进行非均相催化氢化。发现后者在3.7 atm下使用氧化铂(IV)作为催化剂具有化学选择性,从而以中等至高收率(35-95%)和高非对映选择性(92:8至> 99:1)提供氨基吲哚并咪唑。实验已经证明氢化是通过含有吡咯部分的中间体5,6,7,8-四氢吲哚嗪发生的。而且,