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.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3201043 | PMC |
http://dx.doi.org/10.3762/bjoc.7.153 | DOI Listing |
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