transition-metal-catalyzed direct synthesis of valuable α-pyrrolylbenzylamines is disclosed. The reaction is proposed to involve a transient ammonium ylide of a new class of electrophilic rhodium enalcarbenoid, its regioselective Mannich reaction, and a cyclocondensation cascade. The methodology was used in a highly diastereoselective synthesis of a binaphthyl based chiral pyrrole.
3-substituted indoles with diazoenals furnished privileged pyrido[1,2-a]indoles. The reaction is proposed to involve a [4 + 2]-annulation of the diacceptor rhodium enalcarbenoid via C-2 functionalization of the indole. The utility of the methodology was demonstrated with a short synthesis of the tetrahydropyrido[1,2-a]indole core, present in a large number of biologically important polycyclic indole alkaloids
一种新颖的铑催化3-取代的吲哚与重氮烯的吡啶鎓吡啶环反应,并提供了优先的吡啶并[1,2- a ]吲哚。提出该反应涉及通过吲哚的C-2官能化使二受体铑烯醛烯类化合物[4 + 2]环化。该方法的实用性通过四氢吡啶并[1,2- a ]吲哚核的短合成得到证明,该四氢吡啶并[1,2- a ]吲哚核存在于大量生物学上重要的多环吲哚生物碱中。