2-(2-chloroethyl)-17-ethyl-21,24-dihydro-8,12-bis-(2-methoxycarbonylethyl)-3,7,13,18-tetramethylbilin-1,19-dione 在
sodium hydroxide 作用下,
以
吡啶 为溶剂,
反应 2.5h,
以69%的产率得到17-ethyl-21,24-dihydro-8,12-bis-(2-methoxycarbonylethyl)-3,7,13,18-tetramethyl-2-vinylbilin-1,19-dione