Tetrapyrroles. V. Formal syntheses of the ring-C,D pyrromethenones of phytochrome and phycocyanin
作者:Peter A. Jacobi、Robert W. DeSimone
DOI:10.1016/s0040-4039(00)60942-5
日期:1992.10
Formal syntheses of pyrromethenones 2 and 3, potential intermediates for the preparation of phycocyanin (5) and phytochrome (4). respectively. have been accomplished by Pd(o) mediated coupling of iodopyrrole 7 with acetylenic amides of general structure 8a,b, followed by F- catalyzed 5-exo-dig cyclization and DDQ oxidation.