Enantioselective aldol reactions of various isatins with ketones using newly designed amino amide organocatalysts were found to provide chiral 3-substituted 3-hydroxy-2-oxindoles in good to excellent yields and with excellent stereoselectivities (up to 99 %, up to 98 % ee, syn/anti = 99:1); one catalyst, 3i, proved particularly successful. One of the resulting oxindoles, 3-hydroxy-3-(2-oxocyclohexyl)-2-indolinone may serve as a synthetic intermediate for pharmaceutically important compounds and, in its own right, shows interesting anticonvulsant activities.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry