(1S,3R,4R)-3-(2'-hydroxy-1'(R)-phenyl-ethylcarbamoyl)-2-aza-bicyclo-[2.2.1]-heptane-2-N-carboxylic acid p-nitrobenzyl ester 在
甲基磺酰氯 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
以83%的产率得到(1S,3R,4R)-3-(4',5'-dihydro-5'(R)-phenyl-1',3'-oxazol-2'-yl)-2-aza-bicyclo-[2.2.1]-heptane-2-N-carboxylic acid p-nitrobenzyl ester