4-(tert-butyldimethylsilyloxy)-dihydrofuran-2(3H)-one 、
(+/-)-7,8-dihydro-6,6-dimethyl-7-hydroxy-8-amino-6H-pyrano[2,3-f]benz-2,1-3-oxadiazole 以12.50 g (48%)的产率得到7,8-dihydro-6,6-dimethyl-7-hydroxy-8-(n-(1-oxo-3-t-butyldimethylsilyloxy-4-hydroxy)butyl)amino-6H-pyrano[2,3-f]benzo-2,1,3-oxadiazole