C. Caubere et al., FUNCTIONALIZATION OF THE ALKOXY GROUP OF ALKYL ARYL ETHERS - DEMETHYLATION, ALKYLTHIOLATION AND REDUCTION OF 5-METHOXYINDOLES, Tetrahedron, 50(47), 1994, pp. 13433-13448
In the presence of AlX(3)-RSH three kinds of reactions may take place
with 5-methoxy indoles : demethylation, alkylthiolation and reduction.
The two latter reactions have never been observed to the present, wit
h such reagents. Considerable improvement in the selective demethylati
on was found when PhCH(2)SH replaced EtSH previously used in such tran
sformations. Factors leading to selective alkylthiolations or reductio
ns are shown and mechanisms are proposed to explain these new reaction
s.