147345-97-9Relevant academic research and scientific papers
Optically active iridium imidazol-2-ylidene-oxazoline complexes: Preparation and use in asymmetric hydrogenation of arylalkenes
Perry, Marc C.,Cui, Xiuhua,Powell, Mark T.,Hou, Duen-Ren,Reibenspies, Joseph H.,Burgess, Kevin
, p. 113 - 123 (2007/10/03)
This work explores the potential of iridium complexes of the N-heterocyclic carbene oxazoline ligands 1 in asymmetric hydrogenations of arylalkenes. The accessible carbene precursors, imidazolium salts 2, and robust iridium complexes 5 facilitated a disco
Modified guanidines as potential chiral superbases. 2. Preparation of 1,3-unsubstituted and 1-substituted 2-iminoimidazolidine derivatives and a related guanidine by the 2-chloro-1,3-dimethylimidazolinium chloride-induced cyclization of thioureas
Isobe,Fukuda,Tokunaga,Seki,Yamaguchi,Ishikawa
, p. 7774 - 7778 (2007/10/03)
Simple preparation methods for modified guanidines were explored for new chiral superbases. Thus, (4S,5S)-4,5-diphenyl- and diastereomeric cyclohexane-fused 2-iminoimidazolidines were prepared from (1S,2S) - 1,2 -diphenylethylenediamine and (1R,2R)- or (1S,2S)-1,2-diaminocyclohexanes through cyclization of protected thiourea intermediates with 2-chloro-1,3-dimethylimidazolinium chloride (DMC) as a key reaction. In the (4S,5S)-4,5-diphenyl series 1-methyl-2-iminoimidazolidines and 2-diethylaminoimidazoline were also prepared as related guanidines.
