作者:Stephen G. Davies、Ai M. Fletcher、Clément Lebée、Paul M. Roberts、James E. Thomson、Jingda Yin
DOI:10.1016/j.tet.2012.11.080
日期:2013.1
The most efficient and concise asymmetric synthesis of (−)-(1R,7aS)-absouline to date, which was accomplished in eight steps and 20% overall yield from commercially available starting materials, is described. The doubly diastereoselective conjugate addition of lithium (S)-N-benzyl-N-(α-methylbenzyl)-amide to an enantiopure α,β-unsaturated ester derived from l-proline was employed as the key step. Subsequent
描述了迄今为止最有效,最简明的(-)-(1 R,7a S)-absouline的不对称合成,该合成过程可通过八个步骤完成,从市售起始原料中可获得20%的总收率。的非对映选择性双重共轭加成的锂(小号) - ñ苄基ñ - (α -甲基苄基) -酰胺从得到的对映体纯的α,β -不饱和酯升-脯氨酸被用作关键步骤。随后的氢解N-脱苄基化和酸促进的β-氨基酯的环化反应生成1-氨基吡咯并丁-3-酮支架,然后用DIBAL-H还原,然后DCC介导与(E)-p偶联-甲氧基肉桂酸完成(-)-(1 R,7a S)-absouline的合成。