Camphor-derived C1-symmetric chiral diamine organocatalysts for asymmetric Michael addition of nitroalkanes to enones
作者:Yirong Zhou、Qiang Liu、Yuefa Gong
DOI:10.1039/c2ob25922b
日期:——
A series of stable C1-symmetric chiral diamines (2a–2l) were conveniently synthesized by condensing exo-(−)-bornylamine or (+)-(1S,2S,5R)-menthylamine with various commercially available Cbz-protected amino acids. Among them, 2a can efficiently promote the Michael addition of nitroalkanes to a broad scope of enones with high yields (up to 96%) and excellent enantioselectivities (up to 98%) under mild conditions.
一系列稳定的C1对称手性二胺(2a-2l)通过将exo-(-)-冰片胺或(+)-(1S,2S,5R)-薄荷胺与各种市售的Cbz保护氨基酸缩合而方便地合成。其中,2a在温和条件下能高效促进硝基烷烃对广泛范围的烯酮的迈克尔加成反应,产率高达96%,立体选择性极佳(高达98%)。