TETRAPHOS-Rh complex is increased by association of DABN. In contrast, the diamine-free complex is chirally more stable than the BIPHEP counterpart. The higher levels of enantioselectivity in ene-type cyclization of 1,6-enynes can thus be achieved even at room temperature by the diamine-free TETRAPHOS-Rh complex.
[反应和结构:见正文]手性二胺不仅可以控制TropOS TE
TRAPHOS-Rh配合物的轴向手性,而且还可以控制其螺旋手性。
DABN的结合增加了TE
TRAPHOS-Rh复合物的灵活性。相反,不含二胺的配合物比BIPHEP对应物在手性上更稳定。因此,即使在室温下,通过不含二胺的TE
TRAPHOS-Rh络合物,也可以在1,6-
炔烃的烯型环化中实现更高
水平的对映选择性。