Copper(I)/succinic acid cooperatively catalyzed one-pot synthesis of organoselenium-propargylamines via A3-coupling
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Selenium propargylamines were synthesized via an A(3)-coupling approach using piperidine, p-methoxybenzaldehyde, and trimethylsilyl selenium-acetylene, catalyzed by copper(i) chloride and succinic acid as an additive, in good to excellent yields. This method is advantageous in that desilylation of the trimethylsilyl selenium-acetylene occurs in situ. The reaction time was monitored by FTIR studies and a probable mechanism is described. Scale-up was also performed in satisfactory yield. These selenium propargylamines could be hydrohalogenated to synthesize halovinyl selenides. The stereochemistry was determined by treatment with n-butyllithium and the coupling constant (J) values in H-1 NMR spectra. The vinyl selenides were employed in Sonogashira cross-coupling reactions to produce the corresponding enynes, with yields ranging from moderate to good.
Oliveira IM., Pimenta DC, Zukerman-Schpector J, Stefani HA., Manarin F. Copper(I)/succinic acid cooperatively catalyzed one-pot synthesis of organoselenium-propargylamines via A3-coupling. New J. Chem.. 2018;42(12): 10118-23. doi:10.1039/c8nj01543k.
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