The first enantioselective synthesis of chiral norbornane-type 1,4-diamine ligand
作者:Cihangir Tanyeli、Salih Özçubukçu
DOI:10.1016/s0957-4166(03)00161-7
日期:2003.5
The asymmetric synthesis of trans-2,3-bis(aminomethyl)norbornane was performed starting with endo-2,3-norbornene dicarboxylate anhydride. Desymmetrization of meso-anhydride 1 and following selective epimerization gave the trans-monoester (+)-3 with a high enantiomeric excess (98% e.e.). LiAlH4 reduction of the trans-monoester to the 1,4-diol, which was then treated with phthalimide under Mitsunobu
从内生-2,3-降冰片烯二羧酸酐开始,进行反式-2,3-双(氨基甲基)降冰片烷的不对称合成。的Desymmetrization内消旋-anhydride 1和下面的选择性的差向异构化,得到反式-monoester(+) - 3具有高对映体过量(98%ee)的。的LiAlH 4还原的反式-monoester到-1,4-二醇,然后将其用在Mitsunobu条件下邻苯二甲酰亚胺和,承接加布里埃尔型胺合成用水合肼,得到一饱和和不饱和的二胺混合物。混合物加氢最终得到饱和二胺(+)- 8 收率为37%。