(±)-4-(2,3-dihydro-benzo[1,4]dioxin-2-yl)-benzaldehyde 、
哌啶-4-甲酸乙酯 在
异丙醇 、 heptanes 作用下,
以to give (S)-1-{4-(2,3-dihydro-benzo[1,4]dioxin-2-yl)-benzyl}-piperidine-4-carboxylic acid ethyl ester as the first-eluting peak, and (R)-1-[4-(2,3-dihydro-benzo[1,4]dioxin-2-yl)-benzyl]-piperidine-4-carboxylic acid ethyl ester as the second-eluting peak的产率得到(S)-1-[4-(2,3-dihydro-benzo[1,4]dioxin-2-yl)-benzyl]-piperidine-4-carboxylic acid ethyl ester