Chlorosulfonic acid → HCID 86692805, compound

Participants

Reaction Steps

Under reaction conditions analogous to preparation of 5-mercaptooxindole, chlorosulfonylation of 4-methyloxindole 3.15 g (21.40 mmol) with neat chlorosulfonic acid 25 mL provided 4.55 g of 5-chlorosulfonyl-4-methyloxindole (86.5% Y, 95% isomeric purity by 1H-NMR, in d6-acetone) which was reduced with triphenyl phosphine 17.0 g (65 mmol) in anhydrous dichloromethane, to provide a crude thiol 2.573 g (75% Y) which was then methylated with excess of methyl iodide (1.50 mL; 24 mmol) to provide a crude methylthio intermediate 2.722 g (98% Y, 90% pure), by using conditions analogous to preparation of 5-methylsulfoxyoxindole.

Provenance & Evidence