Cobalt-Mediated Synthesis of Propargyl Nitriles and α-Alkoxy Propargyl Nitriles
作者:John G. Stuart、Kenneth M. Nicholas
DOI:10.1055/s-1989-27287
日期:——
Dicobalt hexacarbonyl complexes of propargyl acetates and acetylenic acetals couple efficiently with diethylaluminum cyanide to produce the corresponding complexed propargyl nitriles and cyanohydrin derivatives, respectively. A convenient procedure far preparing propargyl nitriles and α-alkoxy propargyl nitriles from propargyl alcohols and acetylenic acetals using this methodology is described.
The first asymmetric propargylic radical cyanation was realized through a dual photoredox and copper catalysis. An organic photocatalyst serves to both generate propargyl radicals and oxidize Cu(I) species to Cu(II) species. A chiral Cu complex functions as an efficient organometallic catalyst to resemble the propargyl radical and cyanide in an enantio-controlled manner. Thus, a diverse range of optically
Chiral propargylic cyanides are often used as small-molecule feedstocks for the introduction of chiral centers into various valuable products and complex molecules. Here, we have developed a highly atom-economical strategy for the chiral copper complex-catalyzed synthesis of chiral propargylic cyanides. Propargylic radicals can be smoothly obtained by direct decarboxylation of the propargylic carboxylic