[N,N'-di-(tert-butoxycarbonyl)]-2-ethoxyguanidine 、
[3-[(benzylsulfonyl)amino]-2-oxo-1,2-dihydropyridyl]acetic acid 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以68%的产率得到3-benzylsulfonylamino-1-{[N,N'-di(tert-butoxycarbonyl)][2-(guanidinooxyethyl)aminocarbonylmethyl]}-2-pyridinone