decade has rendered chiral organoiodine(I/III) catalysis a reliable methodology in asymmetric catalysis. However, due to the severely limited numbers of effective organoiodine catalysts, many reactions still give low to modest enantioselectivity. We report herein a solution to this issue through the introduction of a pivotal indanol scaffold to the catalyst design. Our catalyst architecture exhibits
Enantioselective Kinetic Resolution/Desymmetrization of
<i>Para</i>
‐Quinols: A Case Study in Boronic‐Acid‐Directed Phosphoric Acid Catalysis
作者:Banruo Huang、Ying He、Mark D. Levin、Jaime A. S. Coelho、Robert G. Bergman、F. Dean Toste
DOI:10.1002/adsc.201900816
日期:2020.1.23
A chiral phosphoric acid‐catalyzed kineticresolution and desymmetrization of para‐quinols operating via oxa‐Michael addition was developed and subsequently subjected to mechanistic study. Good to excellent s‐factors/enantioselectivities were obtained over a broad range of substrates. Kinetic studies were performed, and DFT studies favor a hydrogen bonding activation mode. The mechanistic studies provide
Continuous-Flow Synthesis of Trimethylsilylphenyl Perfluorosulfonate Benzyne Precursors
作者:Boris Michel、Michael F. Greaney
DOI:10.1021/ol500959e
日期:2014.5.16
2-(Trimethylsilyl)phenyl perfluorosulfonated aryne precursors may now be accessed using flow chemistry, enabling the fast preparation of pure compounds with no requirement for low temperature lithiation or column chromatography. The process has been adapted to novel nonaflate precursors, utilizing the cheaper and more user-friendly nonaflyl fluoride reagent. The resultant nonaflates are shown to successfully
Chiral aryl iodide catalysts for the enantioselective synthesis of para-quinols
作者:Kelly A. Volp、Andrew M. Harned
DOI:10.1039/c3cc00013c
日期:——
Molecular modelling of an iodine(III) phenoxide was used as a starting point in the design of chiral aryl iodide catalysts for stereoselective oxidative dearomatization reactions. Using this approach, catalysts derived from 8-iodotetralone and tartaric acid were constructed and used to synthesize enantioenriched para-quinols from phenols.