Stereoselective Synthesis of 4‐Dehydroxydiversonol Employing Enantioselective Palladium‐Catalysed Domino Reactions
作者:Lutz F. Tietze、Dirk A. Spiegl、Florian Stecker、Julia Major、Christian Raith、Christian Große
DOI:10.1002/chem.200800967
日期:2008.10.10
Wacker-carbonylation reaction for the formation of the central chroman moiety is described. Thus, reaction of 8 with palladium(II) trifluoroacetate [Pd(OTFA)2] in the presence of carbonmonoxide, methanol and the 2,2'- bis(oxazolin-2-yl)-1,1'-binaphthyl (BOXAX) ligand 17 led to 19 in 80% yield and 96% ee. Similarly, the chroman 7 was prepared using 8 and methyl acrylate (9) as starting material. Hydrogenation of the