Organocatalytic asymmetric [4+ 1] annulation of in situ generated ortho-quinomethanes with 4-halo pyrazolones: straightforward access to chiral spiro-benzofuran pyrazolones.
DOI Number:
10.1039/C9QO00332K
Reaction Category:
Educt:
2-methoxy-6-(phenyl(tosyl)methyl)phenol, 4-bromo-2-(3-bromophenyl)-5-methyl-2,4-dihydro-3H-pyrazol-3-one
Product:
spirobenzofuranpyrazolones
Catalyst:
3-[[3,5-bis(trifluoromethyl)phenyl]amino]-4-[[(8α,9S)-6′-methoxycinchonan-9-yl]amino]-3-Cyclobutene-1,2-dione
Cas No:
1256245-84-7
Associated Product from Buchler GmbH:
Quinine Base
Cas No:
130-95-0