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Several borohydride reagents: sodium borohydride, sodium cyanoborohydride, soudium acetoxyborohydride and soudium triacetoxyborohydride were screened, respectively, for the reduction of 7-demethylsinomenine, which was an α,β-dicarbonyl compound derived from sinomenine. Highly regio- and stereo-selectivity was acquired when sodium cyanoborohydride or NaBH(OAc) 3 was used. The product was structurally...
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