Organic Letters
Letter
mixture was concentrated under reduced pressure, and the residue
was purified by flash column chromatography to give 5a in 20% yield.
(20) (a) Dempsey, J. L.; Brunschwig, B. S.; Winkler, J. R.; Gray, H.
B. Acc. Chem. Res. 2009, 42, 1995−2004. (b) Du, P.; Knowles, K.;
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(21) Compounds 5 might be obtained through nucleophilic addition
and subsequent desulfurization pathways. For related literature, see:
(a) Koutentis, P. A.; Koyioni, M.; Michaelidou, S. S. Org. Biomol.
Chem. 2013, 11, 621−629. (b) Besson, T.; Rees, C. W. J. J. Chem. Soc.,
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ACKNOWLEDGMENTS
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This study was supported by the National Natural Science
Foundation of China (21431001 and 81760626), Natural
Science Foundation of Guangxi (AB17292075,
2016GXNSFEA380001, 2016GXNSFGA380005, and
2017GXNSFBA198205), Education Ministry Foundation of
China (IRT_16R15), Guangxi Funds for Distinguished
Experts, The Youth Promotion Fund of Guangxi
(2017KY0475 and 2018KY0400), and the State Key
Laboratory for Chemistry and Molecular Engineering of
Medicinal Resources (Guangxi Normal University)
(CMEMR2018-B08, CMEMR2017-A02, and CMEMR2017-
A07) .
(22) Mirjafary, Z.; Ahmadi, L.; Moradi, M.; Saeidian, H. RSC Adv.
2015, 5, 78038−78046.
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E
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