Asymmetric three-component Strecker reactions catalyzed by trans-4-hydroxy-L-proline-derived N,N'-dioxides.
Novel trans-4-hydroxy-L-proline-derived N,N'-dioxides have been developed and used as efficient organocatalysts for the one-pot three-component Strecker reaction with an aldehyde, (1,1-diphenyl)methylamine, and TMSCN. Both aromatic and aliphatic aldehydes were found to be suitable substrates. The corresponding alpha-amino nitriles were obtained in high yields with up to 95 % ee (ee=enantiomeric excess) under mild conditions. Optically pure products could be obtained after a single recrystallization. The catalyst can be easily prepared from trans-4-hydroxy-L-proline and a diamine in three steps. Based on the experimental results and the observed absolute configurations of the products, a possible transition state has been proposed to explain the origin of the asymmetric induction.
Wen
Yuehong
Y
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, China.
Gao
Bo
B
Fu
Yingzi
Y
Dong
Shunxi
S
Liu
Xiaohua
X
Feng
Xiaoming
X
D002384:Catalysis; D006909:Hydroxyproline / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010087:Oxides / Q000737:chemistry*
D010087:Oxides; D006909:Hydroxyproline