The direct nucleophilic addition to amides represents an attractive methodology in organic synthesis that tackles amidic resonance by ground-state destabilization. This approach has been recently accomplished with carbon, nitrogen and oxygen nucleophiles. Herein, we report an exceedingly mild method for the direct thioesterification and selenoesterification of amides by selective N–C(O) bond cleavage in the absence of transition metals. Acyclic amides undergo N–C(O) to S/Se–C(O) interconversion to give the corresponding thioesters and selenoesters in excellent yields at room temperature via a tetrahedral intermediate pathway (cf. an acyl metal).
A facile electro-reductive hydrodefunctionalization system employing triethylamine as a sacrificial reductant is described, and the selectivity and capability of reduction can be conveniently switched by simple change of the reaction solvent.
描述了一种使用三乙胺作为牺牲还原剂的简便电还原去功能化系统,通过简单地改变反应溶剂,可以方便地切换还原的选择性和能力。