Syntheses of derivatives of L-daunosamine and its C-3 epimer employing as the key step the asymmetric conjugate addition of a homochiral lithium amide to tert-butyl (E,E )-hexa-2,4-dienoate
作者:Stephen G. Davies、G. Darren Smyth、Ann M. Chippindale
DOI:10.1039/a907017f
日期:——
The highly diastereoselective asymmetric conjugate addition of lithium (R)-N-benzyl-α-methylbenzylamide to methyl or tert-butyl (E,E)-hexa-2,4-dienoate, followed by osmium tetroxide-catalysed dihydroxylation of the resulting adducts, provides a concise route to methyl L-daunosaminide hydrochloride and methyl 3-epi-D-daunosaminide hydrochloride, a strategy which is applicable to the synthesis of either