Catalytic Wittig Reactions of Semi- and Nonstabilized Ylides Enabled by Ylide Tuning
作者:Emma E. Coyle、Bryan J. Doonan、Andrew J. Holohan、Killian A. Walsh、Florie Lavigne、Elizabeth H. Krenske、Christopher J. O'Brien
DOI:10.1002/anie.201406103
日期:2014.11.17
The first examples of catalytic Wittigreactions with semistabilized and nonstabilized ylides are reported. These reactions were enabled by utilization of a masked base, sodium tert‐butyl carbonate, and/or ylide tuning. The acidity of the ylide‐forming proton was tuned by varying the electron density at the phosphorus center in the precatalyst, thus facilitating the use of relatively mild bases. Steric