The Rational Synthesis of Chlorins via Rearrangement of Porphodimethenes: Influence of β-Substituents on the Regioselectivity and Stereoselectivity of Pyrroline Ring Formation
作者:Dennis H. Burns、Yue H. Li、Dong C. Shi、Timothy M. Caldwell
DOI:10.1021/jo020105f
日期:2002.6.1
density, with an electron-neutral hydrogen or an electron-withdrawing carbonyl beta-substituent demonstrating the greatest influence on the formation of the pyrrolinering. The synthesis is highly stereoselective when epimerization of the pyrrolinering beta-carbons is possible, furnishing only the trans-reduced sterioisomer. Finally, there is substantial evidence that a fifth, axial ligand is involved