哌啶 、 (3R,4R)-3-(4-cyclopentylmethyl-5-oxo-tetrahydrofuran-3ylmethyl)-1,5,5-trimethyl-imidazolidine-2,4-dione 在
AlCl
3 作用下,
以
二氯甲烷 、
异丙醚 为溶剂,
以17.5 g (85.7%)的产率得到(2R,3R)-3-(3-Cyclopentylmethyl-2-hydroxymethyl-4-oxo-4-piperidin-1-yl butyl)-1,5,5-trimethyl-imidazolidine-2,4-dione