New cyclic aminals derived from rac-trans-1,2-diaminocyclohexane: synthesis and crystal structure of racemic 1,8,10,12-tetraazatetracyclo[8.3.1.1.8,1202,7] pentadecane and a route to its enantiomerically pure (R,R) and (S,S) isomers
作者:Augusto Rivera、Diego Quiroga、Leonardo Jiménez-Cruz、Karla Fejfarová、Michal Dušek
DOI:10.1016/j.tetlet.2011.11.046
日期:2012.1
New enantiomerically pure macrocyclic aminals (2R,7R)- and (2S,7S)-1,8,10,12-tetraazatetracyclo[8.3.1.1.8,1202,7]pentadecane (4a and 4b) were obtained by a three component reaction between their respective pure enantiomer of trans-1,2-diaminocyclohexane, ammonia, and formaldehyde. Additionally, the X-ray structure of the racemic compound 4 and the specific rotations of the racemic and optically pure
新的对映体纯大环缩醛(2 R,7 R)-和(2 S,7 S)-1,8,10,12-四氮杂四环[8.3.1.1。8,12 0 2,7 ]十五烷(图4a和图4b),通过它们各自的纯对映体之间的三个组分反应获得的反式-1,2-二氨基环己烷,氨和甲醛。另外,测定外消旋化合物4的X射线结构以及外消旋和光学纯化合物的比旋光度。为了进一步理解对映异构体4a和4b的合成效用,曼尼希型反应与1进行H-苯并三唑,得到(3a R,7a R)-和(3a S,7a S)-1,1'-[2,3,3a,4,5,6,7,7a-octahydro-1 H -1,3-苯并咪唑-1,3-二基]双(亚甲基)}双-1 H-苯并三唑(9和10),并为制备用于不对称催化的手性配体提供了新的可能性。