posted on 2021-03-04, 20:10authored byTeng Yuan, Qi Tang, Chuan Shan, Xiaohan Ye, Jin Wang, Pengyi Zhao, Lukasz Wojtas, Nicholas Hadler, Hao Chen, Xiaodong Shi
Here
we report the first example of alkyne trifunctionalization
through simultaneous construction of C–C, C–O, and C–N
bonds via gold catalysis. With the assistance of a γ-keto directing
group, sequential gold-catalyzed alkyne hydration, vinyl–gold
nucleophilic addition, and gold(III) reductive elimination were achieved
in one pot. Diazonium salts were identified as both electrophiles
(N source) and oxidants (C source). Vinyl–gold(III) intermediates
were revealed as effective nucleophiles toward diazonium, facilitating
nucleophilic addition and reductive elimination with high efficiency.
The rather comprehensive reaction sequence was achieved with excellent
yields (up to 95%) and broad scope (>50 examples) under mild conditions
(room temperature or 40 °C).