(6S,8aS)-2-benzylsulfonyl-4-oxo-1,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazine-6-carboxylic acid 、
4-(aminomethyl)-3-methylbenzene-1-carboximidamide 在
N-甲基吗啉 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 (6S,8aS)-4-Oxo-2-phenylmethanesulfonyl-octahydro-pyrrolo[1,2-a]pyrazine-6-carboxylic acid 4-carbamimidoyl-2-methyl-benzylamide