Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 86, Issue 21, Pages 15263-15275Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c01870
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Funding
- National Science Foundation of China [2217010098, 21572022, 21372031]
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The study presents an unprecedented dearomatization of biaryl ynones with aldehydes via double C-H functionalization, where regiospecific remote unactivated para-C-H functionalization efficiently furnishes acylated spiro[5.5]trienones, demonstrating high efficiency and economy.
The multiple C-H bonds of biaryl ynones render the 6-exo-trig regioselective C-H activation dearomatization to spiro[5.5]trienones challenging since the competing reactions of C-H bonds on Ar-1 or the ortho-C-H bonds on Ar-3 may result in 5-exo-trig cyclization to indenones or 6-exo-trig ortho-dearomatization, respectively. We here report an unprecendented dearomatization of biaryl ynones with aldehydes via double C-H functionalization where a regiospecific remote unactivated para-C-H functionalization of biaryl ynones efficiently furnishes acylated spiro[5.5]trienones. This cascade cyclization features a green catalyst and solvent and high atom- and step-economy.
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