甲基磺酰氯 、
三氟乙酸酐 、 tert-butyl N-[(1R)-1-(3,5-dibromo-4-hydroxyphenyl)-2-[[(1R)-2-[[(1R,2S)-1-(3,5-dichloro-4-hydroxyphenyl)-3-[[(1S)-1-(3,5-dimethoxyphenyl)-2-(methylamino)-2-oxoethyl]amino]-1-hydroxy-3-oxopropan-2-yl]amino]-1-(4-methoxy-2-phenylmethoxyphenyl)-2-oxoethyl]amino]-2-oxoethyl]carbamate 以46%的产率得到[(8R,11R,14S,15R)-5-bromo-18,19-dichloro-14-[[(1S)-1-(3,5-dimethoxyphenyl)-2-(methylamino)-2-oxoethyl]carbamoyl]-15-hydroxy-11-(4-methoxy-2-phenylmethoxyphenyl)-9,12-dioxo-8-[(2,2,2-trifluoroacetyl)amino]-2-oxa-10,13-diazatricyclo[14.2.2.13,7]henicosa-1(18),3,5,7(21),16,19-hexaen-4-yl] methanesulfonate