A Neutral, Chiral, Bis(imidazolidine)-Derived NCN-Type Palladium Pincer Complex with Catalytic Activity
作者:Takayoshi Arai、Ikiyo Oka、Takuma Morihata、Atsuko Awata、Hyuma Masu
DOI:10.1002/chem.201204017
日期:2013.1.28
Caught in a pincer: A chiral, imidazolidine‐derived NCN‐type palladiumpincercomplex has been prepared using a ligand introduction technique. Single‐crystal X‐ray diffraction analysis of this complex showed a well‐organized asymmetric sphere. The neutralpalladium/chloride version exhibited significant catalyticactivity for the reaction of nitroalkenes with malononitrile to give products in a highly
A novel enantioselective Michaeladdition of malononitrile to trans‐β‐nitroolefins in the presence of bifunctional amine thiourea organocatalyst is developed. The Michael reaction catalyzed by amine thioureas containing both central and axial chiral elements proceeded smoothly and provided the desired adducts with high yields (up to 96% yield) and moderate enantioselectivities (up to 83% enantiomeric