1-甲基-1,2,3,6-四氢吡啶

氯甲酸乙酯

1,2,3,6-四氢-1-(苯基甲基)吡啶

4-[(toluene-4-sulfonyl)-hydrazono]-piperidine-1-carboxylic acid ethyl ester

ethyl 4-methylsulfonyloxypiperidine-1-carboxylate