(Z)-1,3,4,5-Tetrahydro-3,3,3',4'-tetramethyl-5-oxo-2,2'-pyrromethen-5'-carbonsaeure-tert-butylester 、
(Z)-1,5-Dihydro-3-ethyl-3',4-dimethyl-5'-formyl-5-oxo-2,2'-dipyrrylmethen-4'-hexadecylpropionat 以
三氟乙酸 为溶剂,
以76%的产率得到(Z,Z,Z)-1,19-Dioxo-3,3,7,8,13,18-hexamethyl-17-ethyl-12-(hexadecylcarboxy-2-ethyl)-1,2,3,19,23,24-hexahydro-21H-bilin