Asymmetric Hydroxylative Phenol Dearomatization Promoted by Chiral Binaphthylic and Biphenylic Iodanes
作者:Cyril Bosset、Romain Coffinier、Philippe A. Peixoto、Mourad El Assal、Karinne Miqueu、Jean-Marc Sotiropoulos、Laurent Pouységu、Stéphane Quideau
DOI:10.1002/anie.201403571
日期:2014.9.8
The long‐standing quest for chiral hypervalent organoiodine compounds (i.e., iodanes) as metal‐free reagents for asymmetric synthesis continues. Although remarkable progress has recently been made in organoiodine‐catalyzed reactions using a terminal oxidant in stoichiometric amounts, there is still a significant need for “flaskable” chiral iodane reagents. Herein, we describe the synthesis of new iodobinaphthyls
Amino acid-derived novel chiral hypervalent iodine(V) reagents were synthesized from the corresponding chiral iodoarenes through DMDO oxidations. Their oxidation states were determined by the 13C NMR chemical shifts of the ipso-carbon of the iodine atom, HRMS analysis, and elemental analyses. They were applied to the enantioselective hydroxylative dearomatization/[4+2]-dimerization cascade reactions
从相应的手性碘芳烃通过DMDO氧化合成了氨基酸衍生的新型手性高价碘试剂。它们的氧化态由碘原子的ipso-碳的13 C NMR化学位移,HRMS分析和元素分析确定。将它们用于苯酚衍生物的对映选择性羟基化脱芳香化/ [4 + 2]-二聚级联反应,得到所需产物,其ee最高为58%。
Asymmetric syntheses and applications of planar chiral hypervalent iodine(V) reagents with crown ether backbones
Novel optically active hypervalent iodine(V) reagents with planar chiral crown ether backbones were synthesized using the intramolecular Huisgen reaction as a key step and l-methyl lactate as the source of chirality. The relative configurations of these reagents and stabilities of planar chiralities were determined by DFT calculations. These planar chiral reagents were applied to the hydroxylative
Enantioselective Synthesis of Bicyclo[2.2.2]octenones Using a Copper-Mediated Oxidative Dearomatization/[4 + 2] Dimerization Cascade
作者:Suwei Dong、Jianglong Zhu、John A. Porco
DOI:10.1021/ja711018z
日期:2008.3.1
An enantioselective approach to bicyclo[2.2.2]octenone structures utilizing a copper-mediated asymmetric oxidative dearomatization/[4 + 2] dimerization cascade is described. The total synthesis and absolute stereochemistry reassignment of (+)-aquaticol has been achieved using the methodology.
Microwave-Based Reaction Screening: Tandem Retro-Diels–Alder/Diels–Alder Cycloadditions of<i>o</i>-Quinol Dimers
作者:Suwei Dong、Katharine J. Cahill、Moon-Il Kang、Nancy H. Colburn、Curtis J. Henrich、Jennifer A. Wilson、John A. Beutler、Richard P. Johnson、John A. Porco
DOI:10.1021/jo201658y
日期:2011.11.4
We have accomplished a parallel screen of cycloaddition partners for o-quinols utilizing a plate-based microwave system. Microwave irradiation improves the efficiency of retro-Diels-Alder/Diels-Alder cascades of o-quinol dimers which generally proceed in a diastereoselective fashion. Computational studies indicate that asynchronous transition states are favored in Diels-Alder cycloadditions of o-quinols. Subsequent biological evaluation of a collection of cycloadducts has identified an inhibitor of activator protein-1 (AP-1), an oncogenic transcription factor.