L-丙氨酸甲酯盐酸盐 、
3-{2-[3-(2-Carboxy-ethyl)-5-[3,4-dimethyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-4-methyl-pyrrol-(2Z)-ylidenemethyl]-5-[3,4-dimethyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-4-methyl-1H-pyrrol-3-yl}-propionic acid 在
diphosphoryl azide 、
三乙胺 作用下,
以
二甲基亚砜 为溶剂,
反应 24.0h,
以39%的产率得到8,12-bis-(2-carboxyethyl)-2,3,7,13,17,18-hexamethyl-1,19,21,24-tetrahydro-1,19-dioxobilin bis-amide with S-(+)-alanine methyl ester