Pyridine → 5-(2,3-Dihydro-indole-1-sulfonyl)-1,3-dihydro-indol-2-one

Participants

Reaction Steps

To a mixture of 5-chlorosulfonyl-2-oxindole (5 g, 21.6 mmol) and indoline (2.9 mL, 26 mmol) in THF (20 mL) was added pyridine (3.4 g, 43 mmol). After stirring at room temperature for one day, the precipitate was collected by filtration, washed with water in ethanol (20%), dried, washed with 60 mL of hot ethanol and dried under vacuum to give 7.5 g (over 100%) of 5-(2,3-dihydro-indole-1-sulfonyl)-1,3-dihydro-indol-2-one as a pink solid.

Provenance & Evidence