Enantiomerically Pure 2-(Carbamoyloxy)oxiranes and Their Utility in the Synthesis of D- and L-3,6-Dideoxy-3-C-methylhexofuranosides via the Homoaldol Reaction

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Abstract
As an example of a novel flexible strategy in the rapid enantioselective construction of branched carbohydrate analogues by the homoaldol reaction, the title compounds were synthesized. α-Metalated (E)-2-butenyl N,N-diisopropylcarbamate is added to (S)- or (R)-2-benzyloxypropanal. The homoaldol adducts are epoxidized; methanolysis affords furanosides of branched 3,6-dideoxyaldohexoses, or, hydrolysis yields the furanoses.

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