N-[(5-Acetyl-6H-[1,3]thiazin-2-yl)-methoxy-methoxycarbonyl-methyl]-phthalamic acid methyl ester 在
lithium hydroxide 、 aluminium amalgam 、 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 作用下,
以
甲醇 为溶剂,
生成 2-((6S,7S)-3-Acetyl-7-methoxy-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-yl)-isoindole-1,3-dione