>>it could be easily made from the corresponding indole by reduction with BH3*THF complex.
>This doesn't work, but NaBH4 / AcOH could be used for that reaction.
J.Org.Chem. (1984) 49(26), 5124-5131.
J.Org.Chem. (1985) 50(12), 2066-2073.
Admittedly, the reagent of choice for reducing the 2,3-double bond is NaCNBH3, but BH3*THF does indeed work, for the record. Other common reagents used to reduce the 2,3-double bond include zinc borohydride and tetrabutylammonium borohydride.