N-Iodosuccinimide → 5-Iodoindolin-2-one

Participants

Reaction Conditions

Reaction Steps

2-Oxindole (82.9 g) was suspended in 630 mL acetic acid and the misture was mechanically stirred and cooled to 10° C. in an ice water bath. Solid N-iodosuccinimide (175 g) was added in portions over 10 minutes. After the addition was complete the mixture was stirred for 1 hour at 10° C. The suspended solid which was always present became very thick at this time. The solid was collected by vacuum filtration, washed with 100 mL of 50% acetic acid in water and then with 200 mL of water and sucked dry for 20 minutes in the filtration funnel. The product was dried under vacuum to give 93.5 g (36%) of 5-iodo-2-oxindole containing about 5% 2-oxindole by proton NMR.

Provenance & Evidence