三氟甲磺酸酐 、
2-deoxy-3,4-O-isopropylidene-D-erythro-pent-1-enose dimethyldithioacetal 在
2,6-di-tert-butyl-4-methylpyridine 作用下,
以
二氯甲烷 为溶剂,
以90%的产率得到methyl 2-deoxy-3,4-O-isopropylidene-5-[(R)-methyl episulfonium]-1-thio-D-erythro-pent-1-enopyranoside trifluoromethanesulfonate