Found this a couple of weeks ago. May help further:
reduction of organic compounds with sodium borhydride-copper (II) sulfate system. Yoo, Sung Eun, Sang Hee. Korea Res. Inst. Chem. Technol., Chungnam, S.Korea. Synlett (1990), (7), 419-20. Journal Written in English.
Abstract
The reduction of various functional groups was investigated using sodium borohydride-copper (II) sulfate. Ketones, aliph. esters, olefins, nitriles and aliphatic and aromatic nitro groups were reduced, but amides and aliphatic and aromatic carboxylic acids were inert. The rate of reaction was different for the various functional groups, allowing selective reductions to be performed.