Facile synthesis of 1,4-oxazines by ruthenium-catalyzed tandem N-H insertion/cyclization of α-arylamino ketones and diazo pyruvates
2020
Herein, we report an efficient strategy for the rapid construction of 1,4-oxazines starting from simple -amino ketones and diazo pyruvates under mild reaction conditions. This transformation is efficiently catalyzed by RuCl3 through a tandem N-H insertion/cyclization sequence via an enol formation. This reaction shows a broad functional group tolerance and the resulted 1,4-oxazine products show promising anticancer activities toward HCT116.
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