3-O-methacryloyl-1,2:5,6-di-O-isopropylidene-D-glucofuranose 、 valeronitrile oxide 在
吡啶 、
aluminum oxide 、
N-氯代丁二酰亚胺 作用下,
以70%的产率得到3-Butyl-5-methyl-4,5-dihydro-isoxazole-5-carboxylic acid (3aR,5R,6S,6aR)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl ester