One-Pot Conversion of Aldehydes and Aryl Halides to Disubstituted Alkynes via Tandem Seyferth-Gilbert Homologation/Copper-Free Sonogashira Coupling
Alexander Sapegin, Mikhail Krasavin*
*Saint Petersburg State University, Saint Petersburg 199034, Russia, Email: m.krasavinspbu.ru
A. Sapegin, M. Krasavin, J. Org. Chem., 2019, 84, 8788-8795.
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A mixture of an aldehyde, aryl halide, and the Bestmann-Ohira reagent can be converted into disubstituted acetylene via a successive addition of Cs2CO3 and a Pd(II) catalyst, allowing sufficient time for the Seyferth-Gilbert homologation and Sonogashira coupling to occur. Notably, for the latter reaction, no copper catalyst was required.
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Seyferth-Gilbert Homologation, Sonogashira Coupling