The direct sulfenylation of indoles with aromatic thiols has
been accomplished in the presence of 20 mol% of FeCl3 in
refluxing acetonitrile to produce 3-arylthioindoles in relatively
good to excellent yields and with high selectivity. This method
works even with 2-unsubstituted indoles.
thiolation - indoles - thiols - 3-arylthioindoles