Ugi post-condensation copper-triggered oxidative cascade towards pyrazoles
Pyrazolidinones were prepared in a two-step sequence starting from α-hydrazonocarboxylic acids. After a four-component Ugi coupling, the resulting hydrazone was engaged in a copper triggered [3 + 2] cycloaddition/aerobic oxidation cascade.
Dos Santos, Aurelie,El Kaim, Laurent,Grimaud, Laurence,Ronsseray, Caroline
supporting information; experimental part
p. 1310 - 1314
(2011/11/06)
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