Lewis base catalyzed regioselective cyclization of allene ketones or α-methyl allene ketones with unsaturated pyrazolones.

DOI Number:

10.1039/C9OB00179D

Reaction Category:

Educt:

5-phenylpenta-3,4-dien-2-one, (E)-4-benzylidene-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one

Product:

(S)-1-(6-benzyl-3-methyl-1,4-diphenyl-1,4-dihydropyrano[2,3-c]pyrazol-5-yl)ethan-1-one

Catalyst:

Quinine Base

Cas No:

130-95-0

Cas No:

130-95-0