SYNTHESIS OF ENANTIOMERICALLY PURE 5'-AZA NORARISTEROMYCIN ANALOGS

摘要

The synthesis of a novel class of enantiomerically pure azanoraristeromycins is described. An asymmetric hetero Diels-Alder reaction using amino acid-derived chiral acylnitroso dienophiles 2 was used to prepare optically pure allylic acetate substrate 10. The palladium(0)-catalyzed addition of the sodium salt of adenine to optically pure acetate 10 was achieved to give N-9-alkylated adenine adduct 11 in good yield. Catalytic osmium tetraoxide dihydroxylation of the didehydro analog provided both diol products 17 and 18, corresponding to common natural and unnatural nucleosides, respectively. [References: 46]