Lithium diphenylcuprate treatment of methyl 2,3-anhydro-4,6-0-benzylidene-Dpyranosides in which the anomeric substituent and the three-membered rings are cis oriented furnished the expected ~m-diaxial opening products. When the relationship between the anomeric group and the epoxide was trans, the same experimental conditions led only to recovered starting material. Cyan0 cuprates of the type R2CuCNLi2 added stereoselectively to carbohydrate ketones at C-2 and C-3 fmm the opposite side relative to the anomeric substituent
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