8-amino-7-(2-fluoro-4-iodo-phenylamino)-6-methyl-2,3-dihydro-oxazolo[3,2-a]pyridin-5-one 、
2-benzyloxymethyl-cyclopropanesulfonyl chloride 在
crude product 、 silica gel 、
甲醇 、
二氯甲烷 作用下,
以
吡啶 为溶剂,
以afforded 51 mg of the product (21% yield)的产率得到2-(benzyloxymethyl)-cyclopropanesulfonic acid [7-(2-fluoro-4-iodo-phenylamino)-6-methyl-5-oxo-2,3-dihydro-5H-oxazolo[3,2-a]pyridin-8-yl]-amide