Asymmetric syntheses of (+)-negamycin, (+)-3-epi-negamycin and sperabillin C via lithium amide conjugate addition
作者:Stephen G. Davies、Osamu Ichihara、Paul M. Roberts、James E. Thomson
DOI:10.1016/j.tet.2010.10.067
日期:2011.1
and enantioselective reduction of ethyl 4-chloroacetoacetate and the diastereoselective conjugateaddition of enantiopure lithium N-benzyl-N-(α-methylbenzyl)amide to an α,β-unsaturatedester have been used as the key steps in the total asymmetric syntheses of (+)-negamycin (in 13 steps and 24% overall yield), (+)-3-epi-negamycin (in 13 steps and 10% overall yield) and sperabillin C (in 17 steps and 13%