Asymmetric Syntheses of the Homalium Alkaloids (−)-(<i>S</i>,<i>S</i>)-Homaline and (−)-(<i>R</i>,<i>R</i>)-Hopromine
作者:Stephen G. Davies、James A. Lee、Paul M. Roberts、Jeffrey P. Stonehouse、James E. Thomson
DOI:10.1021/jo3012732
日期:2012.8.17
additions of the novel lithium amide reagents lithium (R)-N-(3-chloropropyl)-N-(alpha-methylbenzyl)amide and lithium (R)-N-(3-chloropropyl)-N-(alpha-methyl-p-methoxybenzyl)amide to alpha,beta-unsaturated esters were used as the key steps in syntheses of the homalium alkaloids (-)-(S,S)-homaline and (-)-(R,R)-hopromine. The asymmetric synthesis of (-)-(S,S)-homaline was achieved in 8 steps and 18% overall
作者:Stephen G. Davies、James A. Lee、Paul M. Roberts、Jeffrey P. Stonehouse、James E. Thomson
DOI:10.1016/j.tetlet.2011.12.088
日期:2012.2
The asymmetric synthesis of (−)-(S,S)-homaline was achieved in 8 steps from commercially available starting materials using the diastereoselective conjugate addition of the novel lithium amide reagent lithium (R)-N-(3-chloropropyl)-N-(α-methyl-p-methoxybenzyl)amide to methyl cinnamate to install the correct stereochemistry. Subsequent functional group manipulation of the resultant β-amino ester and