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Dihydroxylation of Olefins with Dendric Osmium Complex
K.-i. Fujita*, M. Yamazaki, T. Ainoya, T. Tsuchimoto, H. Yasuda
National Institute of Advanced Industrial Science and Technology, Tsukuba and Meiji University, Kawasaki, Japan
21 December 2010 (online)
Dendric osmium complexes 3(Gn) were prepared from N,N,N′,N′-tetramethylethylenediamine 1 in two steps. The complex 3(G3) catalyzed the dihydroxylation of olefins 4 in the presence of NMO to afford the corresponding diols 5 in up to 94% yield (10 examples). In the reaction of 4a, the catalyst was recovered by reprecipitation and reused four times (4th reuse: 91% yield).