F. Fringuelli et al., Cobalt(II) chloride-catalyzed chemoselective sodium borohydride reduction of azides in water, SYNTHESIS-S, (5), 2000, pp. 646-650
Reduction of azides to amines and amides was carried out with NaBH4/CoCl2.
6H(2)O in sole water at 25 degrees C under catalytic heterogeneous conditio
ns. A broad spectrum of azides was reduced in a short time, chemoselectivel
y in high yield and purity.