4-(3-hydroxy-propyl)-2-[2-methyl-1-(3,4,5-trihydroxy-6-methylsulfanyl-tetrahydro-pyran-2-yl)-propylcarbamoyl]-piperidine-1-carboxylic acid tert-butyl ester 、
4-甲苯磺酸酐 在
三乙胺 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 为溶剂,
以58%的产率得到2-[2-Methyl-1-(3,4,5-trihydroxy-6-methylsulfanyl-tetrahydro-pyran-2-yl)-propylcarbamoyl]-4-[3-(toluene-4-sulfonyloxy)-propyl]-piperidine-1-carboxylic acid tert-butyl ester