[(3S,5RS)-7-(4-{(2S)-2-benzyloxycarbonylamino-2-[2-(3-bromo-5-{2,6-dibromo-4-[2-(tert-butoxycarbonylamino)ethyl]phenoxy}-4-hydroxyphenyl)ethylcarbamoyl]ethyl}-2-6-dibromophenoxy)-9-bromo-2,8-dioxo-1-oxaspiro[4.5]deca-6,9-dien-3-yl]carbamic acid benzyl ester 在
sodium dithionite 作用下,
以
水 、
乙腈 为溶剂,
反应 0.17h,
以100%的产率得到(2S)-2-benzyloxycarbonylamino-3-[3-(4-{(2S)-2-benzyloxycarbonylamino-2-[2-(3-bromo-5-{2,6-dibromo-4-[2-(tert-butoxycarbonylamino)ethyl]phenoxy}-4-hydroxyphenyl)ethylcarbamoyl]ethyl}-2,6-dibromo-phenoxy)-5-bromo-4-hydroxyphenyl]propionic acid