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The Journal of organic chemistry

Copper-catalyzed [4 + 1] cycloadditions of alpha,beta-acetylenic ketones with diazoacetates to form trisubstituted furans.


PMID 18041850

Abstract

Copper-catalyzed [4 + 1] cycloaddition reaction of alpha,beta-acetylenic ketones with alpha-diazo esters offers an efficient, direct route to highly substituted furans. The reaction conditions and the scope of the process are examined, and a possible mechanism is proposed.

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E22201
Ethyl diazoacetate, contains ≥13 wt. % dichloromethane
C4H6N2O2