Protection of COOH and OH groups in acid, base and salt free reactions
作者:Xiaotao Zhu、Bo Qian、Rongbiao Wei、Jian-Dong Huang、Hongli Bao
DOI:10.1039/c8gc00037a
日期:——
We report an iron-catalyzed general functional group protection method with inexpensive reagents. This environmentally benign process does not use acids or bases, and does not produce waste products. Further purification beyond filtration and evaporation is, in most cases, unnecessary. Free COOH and OHgroups can be protected in a one-pot reaction.
ortho-quinone-engaged [4+2] cycloaddition. Two strategic stages were employed to prepare the highly unsaturated cycloaddition precursor 3: (1) synthesizing the diene moiety (C1–C2 and C10–C20 doublebonds) by regioselective ortho-quinone tautomerization, and (2) installing four sp2-hybridized carbon atoms (C3, C5, C6 and C7) in one step using a SeO2-promoted chemo- and regioselective oxidation reaction.