The first successful example of the direct synthesis of Weinreb amides using catalytic hydroxy-directed dehydrative amidation of carboxylicacids using the diboronic acid anhydride catalyst is described. The methodology is applicable to the concise syntheses of eight α-hydroxyketone natural products, namely, sattabacin, 4-hydroxy sattabacin, kurasoins A and B, soraphinols A and B, and circumcins B
Concise, protecting group free total syntheses of (+)-sattabacin and (+)-4-hydroxysattabacin
作者:Matthew R. Aronoff、Neil A. Bourjaily、Kenneth A. Miller
DOI:10.1016/j.tetlet.2010.09.147
日期:2010.12
The first asymmetric total syntheses of the antiviral natural products (+)-sattabacin and (+)-4-hydroxysattabacin are reported. Both total syntheses are remarkably concise and were completed without the use of protectinggroups. These syntheses allowed the unambiguous assignment of the absolute configuration of both natural products. The syntheses of these natural products, which exhibit marked antiviral