The Diels-Alder reaction of 3-[(S)-2-(methoxymethyl)pyrrolidin-1-yl]-1,3-butadiene [(S)-3] with 2-aryl-1-nitroethenes afforded, after hydrolysis, the 5-aryl-2-methyl substituted 4-nitrocyclohexanones (R,S,R)-5 in excellent enantiomeric purities (ee = 95-99 %) and with high diastereoselectivities (ds = 75-95 %).
3-[(S)-2-(甲氧基甲基)pyrrolidin-1-yl]-
1,3-丁二烯[(S)-3]与2-芳基-1-
硝基乙烯的戴尔斯-阿尔德反应经
水解后,得到5-芳基-2-甲基取代的4-硝基
环己酮(R,S,R)-5,具有优异的对映体纯度(ee = 95-99%)和高的差向选择性(ds = 75-95%)。