Generation and Trapping of Radicals Derived from Cyclobutadieneiron Tricarbonyl
作者:Jeffrey H. Byers、Stephen F. Sontum、Tina S. Dimitrova、Sumaya Huque、Benjamin M. Zegarelli、Yong Zhang、Jerry P. Jasinski、Raymond J. Butcher
DOI:10.1021/om060263n
日期:2006.7.1
Trapping products consistent with the formation of radical intermediates α to and on the ring carbon of cyclobutadieneiron tricarbonyl have been synthesized. These examples constitute the first strong experimental evidence for the formation of radicals derived from cyclobutadieneiron tricarbonyl.
New cycloaddition/fragmentation strategies for preparing 5-7-5 and 5-7-6 fused tricyclic ring systems
作者:Jing He、Marc L. Snapper
DOI:10.1016/j.tet.2013.05.129
日期:2013.9
Tethering additional functionality to cyclobutadienyl iron tricarbonyl complexes provides new opportunities for the rapid construction of medium-ring-containing polycyclic compounds. Specifically, an intramolecular cycloaddition between cyclobutadiene and a tethered olefin, followed by an intramolecular cyclopropanation of the resulting cyclobutene-containing adduct generates highly strained pentacyclic intermediates. These compounds can then be relaxed thermally to generate 5-7-5 and 5-7-6 fused tricyclic ring systems that are shared with numerous natural products. (C) 2013 Elsevier Ltd. All rights reserved.