(S)-2-((R)-2-{2-[3,5-Dibromo-4-(pyrrolidin-1-ylazo)-phenyl]-acetylamino}-2-phenyl-acetylamino)-3-(4-hydroxy-phenyl)-propionic acid methyl ester 在
吡啶 、
copper(I) bromide dimethylsulfide complex 、
potassium carbonate 作用下,
以
乙腈 为溶剂,
反应 15.0h,
以77%的产率得到(11R,14S)-5-Bromo-9,12-dioxo-11-phenyl-4-(pyrrolidin-1-ylazo)-2-oxa-10,13-diaza-tricyclo[14.2.2.13,7]henicosa-1(19),3,5,7(21),16(20),17-hexaene-14-carboxylic acid methyl ester