Direct one-pot highly enantioselective assembly of polyketide and carbohydrate synthons
作者:Gui-Ling Zhao、Wei-Wei Liao、Armando Córdova
DOI:10.1016/j.tetlet.2006.05.018
日期:2006.7
short, direct, catalytic, enantioselective synthesis of polyketide segments and carbohydrates is presented. The novel, direct, one-pot, organocatalytic asymmetric tandem cross-aldol/Horner–Wittig–Emmons reactions assemble polyketide and carbohydrate derivatives in good yield with 93–98% ee. The one-pot catalytic asymmetric tandem reaction was applied to a highly enantioselective formal denovo synthesis
Starting with (S)-O-benzylglycidol (9) as only chiral building block, a formal synthesis of protomycinolide IV (1) and the first syntheses of its presumed biogenetic precursors methyl epimycinonate I (2), methyl mycinonate I (3), methyl mycinonate II (4), and decarboxymycinonic acid III (5), have been achieved via the eight-carbon unit (8) as a common intermediate.