Total Synthesis of the Meroterpenoid Manginoid A as Fueled by a Challenging Pinacol Coupling and Bicycle‐forming Etherification
作者:Yu‐An Zhang、Amanda Milkovits、Valay Agarawal、Cooper A. Taylor、Scott A. Snyder
DOI:10.1002/anie.202016178
日期:2021.5.10
accessed through a strategy combining a challenging pinacolcoupling and bicycle‐forming etherification with several additional chemo‐ and regioselective reactions. The success of these key events proved to be highly substrate and condition specific, affording insights for their application to other targets. As a result, not only has a 19‐step totalsynthesis of manginoid A been achieved, but a potential
Chiral phosphine–phosphite ligands in the enantioselective 1,4-addition of Grignard reagents to α,β-unsaturated carbonyl compounds
作者:Qaseem Naeemi、Tobias Robert、Darius P. Kranz、Janna Velder、Hans-Günther Schmalz
DOI:10.1016/j.tetasy.2011.04.018
日期:2011.4
phosphine–phosphite ligands was evaluated in the Cu-catalyzed asymmetric 1,4-addition of Grignard reagents to cyclopentenone, cycloheptenone and 5,6-dihydro-2H-pyran-2-one. TADDOL-based ligands 1a and 1b with a bulky substituent at the ortho-position to the chiral phosphite moiety gave rise to the 1,4-addition products with high enantioselectivities (up to 93% ee). In addition to ethyl-MgBr (as a standard
Enantioselective rhodium(I)-triethylamine catalyzed addition of potassium isopropenyl trifluoroborate to enones
作者:Gojko Lalic、E.J. Corey
DOI:10.1016/j.tetlet.2008.05.147
日期:2008.8
A general process is reported for the highly enantioselective 1,4-addition of isopropenyl trifluoroborate to cyclic enones under catalysis by a chiral Rh(l) complex and triethylamine at room temperature. (C) 2008 Elsevier Ltd. All rights reserved.