Secondary–secondary diamine catalysts for the enantioselective Michael addition of cyclic ketones to nitroalkenes
作者:Sunil V. Pansare、Raie Lene Kirby
DOI:10.1016/j.tet.2009.03.093
日期:2009.6
ketone–nitroalkene Michaeladdition reaction. The stereoselectivity of the Michaeladdition is dependant on the pKa of the N-substituted aminomethyl pendant in these diamines. N′-Aryl aminomethyl pyrrolidines provide γ-nitroketones with moderate to good enantiomeric excess (65–92%). Removal of the hydrogen-bond donor group by N-methylation results in a dramatic reduction of enantioselectivity (average ee