Asymmetric synthesis of spiro[4H-chromene-3,3′-oxindoles] via a squaramide-organocatalytic three-component cascade Knoevenagel/Michael/cyclization sequence.

DOI Number:

10.1007/s11030-024-10852-6

Reaction Category:

Educt:

1-benzyl-5-bromoindoline-2,3-dione, malononitrile, benzo[d][1,3]dioxol-5-ol

Product:

spiro[4H-chromene-3,3′-oxindoles]

Catalyst:

3-[[3,5-Bis(trifluoromethyl)phenyl]amino]-4-[[(9R)-6′-methoxycinchonan-9-yl]amino]-3-cyclobutene-1,2-dione

Cas No:

1256245-79-0

Associated Product from Buchler GmbH:

3-[[3,5-Bis(trifluoromethyl)phenyl]amino]-4-[[(9R)-6′-methoxycinchonan-9-yl]amino]-3-cyclobutene-1,2-dione

Cas No:

1256245-79-0