Citation: Jing-Wei Wan, Xue-Bing Ma, Rong-Xing He, Ming Li. An easy route to exotic 9-epimers of 9-amino-(9-deoxy) cinchona alkaloids with (8S, 9R) and (8R, 9S)-configurations through two inversions of configuration[J]. Chinese Chemical Letters, ;2014, 25(4): 557-560. doi: 10.1016/j.cclet.2013.12.008
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Four exotic chiral organocatalysts, 9-amino-(9-deoxy) cinchona alkaloids with (8S, 9R) and (8R, 9S)- configurations, were conveniently synthesized for the first time in 27-72% total yields through two conversions of configuration at the 9-stereogenic centers of commercially available cinchona alkaloids.
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