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(-)-Cedranediol boronic esters 4, a series of asymmetric homologation reagents were prepared from a new chiral director (-)-cedranediol 3 and boronic acids. (-)-Cedranediol 3 was easily synthesized by the dihydroxylation of (-)-α-cedrene 2 with OsO4. A more convenient method for the preparation of boronic acids was developed as well.
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