乙二醇 、 4-Oxo-piperidine-1-carboxylic acid (1R,2S,5R)-2-[1-(4-methoxy-phenyl)-1-methyl-ethyl]-5-methyl-cyclohexyl ester 在
phenyltrimethylammonium tribromide 作用下,
生成
6-Bromo-1,4-dioxa-8-aza-spiro[4.5]decane-8-carboxylic acid (1R,2S,5R)-2-[1-(4-methoxy-phenyl)-1-methyl-ethyl]-5-methyl-cyclohexyl ester