An improved synthesis of the C,D-ring pyrromethenone of phytochrome and phytochromobilin
作者:Peter A Jacobi、Jiasheng Guo、Sheila I Hauck、Sam H Leung
DOI:10.1016/0040-4039(96)01317-2
日期:1996.8
Pyrromethenone 1b, the C,D-ring segment of both phytochrome (Pr) and phytochromobilin (PΦB) has been prepared in a highly efficient fashion beginning with 2-acetyl-butyrolactone (8). The key steps involved conversion of 8 to the Z-enol triflate 9, followed by Pdo catalyzed coupling with trimethylsilylacetylene, p-chlorophenylselenide ring opening, and amidation, to afford ring-D synthon 11 having the
吡咯烷酮1b是植物色素(Pr)和植物卟啉(PΦB)的C,D环片段,是从2-乙酰基丁内酯(8)开始以高效方式制备的。的关键步骤涉及转化8到Ž烯醇三氟甲磺酸酯9,随后加入Pd ö催化偶联与三甲基硅烷基,p -chlorophenylselenide开环,和酰胺化,得到环d合成子11具有适当的几何形状和氧化态用于转化为1b。