10.1002/adsc.201900419
Advanced Synthesis & Catalysis
1
mg (72%) of 3a; yellow solid, mp 170-171 °C; H NMR
(400 MHz, CDCl3) δ 12.15 (d, J = 10.0 Hz, 1H), 8.30 (dd, J
= 1.6 Hz, 5.2 Hz, 1H), 8.25 (dd, J = 8.4 Hz, 11.6 Hz, 1H),
7.98-7.95 (m, 2H), 7.64-7.59 (m, 1H), 7.54-7.49 (m, 1H),
7.48-7.44 (m, 2H), 6.96-6.93 (m, 1H), 6.83 (d, J = 8.4 Hz,
1H), 6.14 (d, J = 8.4 Hz, 1H); 13C NMR (100 MHz, CDCl3)
δ 191.9, 151.7, 148.5, 142.9, 139.0, 138.3, 131.8, 128.5,
127.5, 118.5, 111.7, 95.3.
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Acknowledgements
We are grateful for the financial support by the National Natural
Science Foundation of China (21602032, 81473082), Natural
Science Foundation of Guangdong Province, China
(2017A030313078) and the One Hundred Young Talent program
of Guangdong University of Technology. We also appreciate for
doctoral candidates Sosthene Ung and Lida Tan in Professor
Chao-Jun Li’s group at McGill University for valuable comments
and revision.
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