화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.136, No.32, 11296-11299, 2014
Catalytic Asymmetric Synthesis of 4-Nitropyrazolidines: An Access to Optically Active 1,2,3-Triamines
The first catalytic enantio- and diastereoselective synthesis of 4-nitropyrazolidines is presented. Asymmetric hydrogen-bonding activation of nitro-olefins facilitated the 1,3-dipolar cycloaddition with hydrazones, affording optically active 4-nitropyrazolidines containing three continuous stereogenic centers as a single diastereomer in up to 99% ee. Furthermore, it is demonstrated that the optically active 4-nitropyrazolidines can be applied as precursors for the synthesis of highly interesting 1,2,3-triamines.