Article ID Journal Published Year Pages File Type
1307796 Inorganica Chimica Acta 2006 6 Pages PDF
Abstract

The SN2′-substitution reaction of various propargyl acetates with lower-order cyanocuprates RCu(CN)Li was examined. In the case of pyridyl-substituted substrates, good to excellent chemical yields of the desired pyridylallenes were obtained without chelate formation, which often hampers the corresponding reactions of magnesium cuprates. In the analogous SN2′-substitutions of chiral secondary propargyl acetates, lower-order cyanocuprates gave the desired allenes with higher enantioselectivities than magnesium cuprates or cyano-Gilman reagents. Thus, their high reactivity and low tendency to racemize allenes make lower-order cyanocuprates the reagents of choice for these SN2′-substitution reactions.

Graphical abstractThe SN2′-substitution of propargyl acetates to the corresponding allenes proceeds with particular high reactivity and enantioselectivy if lower-order cyanocuprates RCu(CN)Li are used. Advantages of these reagents are their low tendency to form chelate complexes with the substrate and to racemize the allenes formed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
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