摘要:
Both enantiomers of the key intermediate, 2-benzyl-5-oxo-tetrahydro-furan-2-carboxylic acid were obtained by asymmetric oxidation of 3 -benzyl-2-hyd roxy-2-cyclopen ten- 1 -one with all ee >= 96%, using the tartaric ester/Ti(OiPr)(4)/t-BuOOH complex, and transformed to the corresponding 4'-substituted nucleoside analogues with up to 61% overall yield. (C) 2008 Elsevier Ltd. All rights reserved.