Synthesis and chemistry of new spiro-Δ1-pyrazoline
In explorations of syntheses and chemistry of spiroheterocycles, we found that the reaction of 2-diazopropane with (E)-α-arylidenepyrrolin-2-one, (E)-α-arylidene-γ-butyrolactone, and (E)-arylidene-N-arylsuccinimide derivatives produced spiro-Δ1