Scheme 26.
Synthesis of various N-substituted pyrazoles from vinamidiniums and vinamides. Method 1: hydrazine/conc. H2SO4, or hydrazine·HCl/NEt3, MeCN, 25–50 °C, 1 h.; Method 2: hydrazine, conc. H2SO4, toluene/MeCN, 120–140 °C, MW, 0.5–2 h.
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