Studies in Chlorin Chemistry. II. A Versatile Synthesis of Dihydrodipyrrins
作者:William G. O'Neal、William P. Roberts、Indranath Ghosh、Peter A. Jacobi
DOI:10.1021/jo050907l
日期:2005.9.1
Dihydrodipyrrins are key building blocks for the synthesis of hydroporphyrins, many of which have important biological activity. The title compounds were prepared in stereo- and regioselective fashion by a three-step sequence consisting of (1) Pd(0)-catalyzed coupling-cyclization of 2-iodopyrroles with γ-alkynoic acids to afford enelactones of the desired substitution pattern, (2) methylenation at