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Beilstein J. Org. Chem. 2014, 10, 990–995, doi:10.3762/bjoc.10.98
Graphical Abstract
Scheme 1: Synthesis of α-alkylidene-β-hydrazino acid derivatives from MBH adducts.
Scheme 2: Initial investigation.
Scheme 3: Synthesis of 1H-pyrazole 7.
Scheme 4: A plausible mechanism for the formations of 3.