Asymmetric desymmetrization of pseudo-meso 5-hydroxy-endo-tricyclo[5.2.1.02,6]deca-4,8-dien-3-ones
作者:Namakkal G Ramesh、Frank J.A.D Bakkeren、Debby de Groot、Umberto Passamonti、Antonius J.H Klunder、Binne Zwanenburg
DOI:10.1016/s0040-4020(01)01007-9
日期:2001.12
-tricyclo[5.2.1.02,6]deca-4,8-dien-3-one. Desymmetrization using (S)-prolinol or its methyl ether leads to the corresponding enaminones in high yields and with a de of 50%. Complete separation of the diastereomers has been conveniently achieved via their acetates. The absolute stereochemistry of the major diastereomer was determined by single-crystal X-ray diffraction analysis. Reductive elimination
从容易获得的伪内消旋-5-羟基-内环-三环[5.2.1.0 2,6 ] deca-4,8-dien-3-one开始,已经完成了通往对映体纯的内-三环癸二烯酮系统的新途径。使用(S)-脯氨醇或其甲基醚进行的不对称化以高收率和50%的de产生相应的烯胺酮。非对映异构体的完全分离已通过其乙酸盐方便地实现。主要的非对映异构体的绝对立体化学是通过单晶X射线衍射分析确定的。用氢化锂铝对手性助剂的还原消除以良好的总收率提供了光学纯的母体三环癸二烯酮。