Enantioselective rhodium-catalyzed hydroacylation to access the four stereoisomers of anti-rodent difenacoum
作者:Maïwenn Jacolot、Sylvie Moebs-Sanchez、Florence Popowycz
DOI:10.1016/j.tetlet.2017.03.034
日期:2017.4
rodenticide in racemic form, is performed using a key step of rhodium catalyzed enantioselective intramolecular hydroacylation. Optimization of the last step, condensation of 4-hydroxycoumarin with chiral 3-([1,1′-biphenyl]-4-yl)-1,2,3,4-tetrahydronaphthalen-1-ol, is also discussed. After chromatographic separation of the cis and trans diastereoisomers, the four stereoisomers were all obtained with
使用铑催化的对映选择性分子内加氢酰化反应的关键步骤,可以有效地合成目前正在以消旋形式用作灭鼠剂的抗凝剂地芬太尼的四种立体异构体。还讨论了最后一步的优化,即4-羟基香豆素与手性3-([[1,1'-联苯] -4-基)-1,2,3,4-四氢萘-1-醇的缩合。色谱分离出顺式和反式非对映异构体后,均获得了四种立体异构体,均具有出色的对映选择性和非对映选择性(ee≈96%,de> 96%)。