Wang Y, Burton DJ. Copper(I)-Only Catalyzed Reactions of (E)-2,3-Difluoro-3-stannylacrylic Ester with Acid Chlorides and Mechanistic Studies of the “Copper Effect” in Stille Coupling Reactions.
Org Lett 2006;
8:1109-11. [PMID:
16524280 DOI:
10.1021/ol053023x]
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Abstract
[reaction: see text] The reactions of (E)-2,3-difluoro-3-stannylacrylic ester with acid chlorides under catalysis of CuI stereospecifically afforded ethyl (2Z)-2,3-difluoro-4-oxo-substituted 2-butenoates in good yields. Moreover, direct spectroscopic observation of the corresponding organocopper reagent was observed for the first time in Stille coupling reactions of organostannanes.
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