(R)-[(S)-2-[(R)-2-tert-Butoxycarbonylamino-3-(4-fluoro-3-nitro-phenyl)-propionylamino]-2-(3,5-dimethoxy-phenyl)-acetylamino]-(3-hydroxy-4-methoxy-phenyl)-acetic acid methyl ester 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 18.0h,
以42%的产率得到(8R,11S,14R)-14-tert-Butoxycarbonylamino-11-(3,5-dimethoxy-phenyl)-4-methoxy-19-nitro-10,13-dioxo-2-oxa-9,12-diaza-tricyclo[14.2.2.1
3,7]henicosa-1(19),3,5,7(21),16(20),17-hexaene-8-carboxylic acid methyl ester