methyl (2R)-2-[[(2S)-2-[[(2R)-2-[[(2R)-2-[3-(3-acetamido-4-bromophenyl)-4,5-dihydroxyphenyl]-2-[(2-methylpropan-2-yl)oxycarbonylamino]acetyl]amino]-2-(3,5-dichloro-4-hydroxyphenyl)acetyl]-methylamino]-3-(4-fluoro-3-nitrophenyl)propanoyl]amino]-2-(4-hydroxyphenyl)acetate 在
18-冠醚-6 、
potassium carbonate 作用下,
以
四氢呋喃 为溶剂,
反应 12.0h,
以95%的产率得到methyl (2R)-2-[[(8R,11R,14S)-5-(3-acetamido-4-bromophenyl)-11-(3,5-dichloro-4-hydroxyphenyl)-4-hydroxy-13-methyl-8-[(2-methylpropan-2-yl)oxycarbonylamino]-18-nitro-9,12-dioxo-2-oxa-10,13-diazatricyclo[14.2.2.13,7]henicosa-1(18),3(21),4,6,16,19-hexaene-14-carbonyl]amino]-2-(4-hydroxyphenyl)acetate