(2R,4S)-2-Benzyl-4-(tert-butyl-dimethyl-silanyloxy)-5-{(R)-5,5-dimethyl-4-[(3-methyl-pyridin-2-ylmethyl)-carbamoyl]-thiazolidin-3-yl}-5-oxo-pentanoic acid 在
N-羟基-7-氮杂苯并三氮唑 、
四丁基氟化铵 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
四氢呋喃 、
N,N-二甲基甲酰胺 为溶剂,
生成 (4R)-3-[(2S,4R)-5-[((3S,4S)-3,4-dihydro-3-hydroxy-2H-1-benzopyran-4-yl)amino]-2-hydroxy-1,5-dioxo-4-(phenylmethyl) pentyl]-5,5-dimethyl-N-[(3-methyl-2-pyridinylmethyl)]-4-thiazolidinecarboxamide