An efficient and robust methodology based on electrochemical techniques for the direct synthesis of aromatic lactones through dehydrogenative C−O cyclization is described. This new and useful electrochemical reaction can tolerate a variety of functional groups, and is scalable to 100 g under mild conditions. Remarkably, heterocycle‐containing substrates can be employed, thus expanding the scope of
Pd-Catalyzed C–H Lactonization for Expedient Synthesis of Biaryl Lactones and Total Synthesis of Cannabinol
作者:Yan Li、Yan-Jun Ding、Jian-Yong Wang、Yi-Ming Su、Xi-Sheng Wang
DOI:10.1021/ol400877q
日期:2013.6.7
cyclization to construct biaryl lactones has been developed. The synthetic utility of this new reaction was demonstrated in an atom-economical and operationally convenient total synthesis of the natural product cannabinol from commercially available starting materials, with the newly developed method used for two key steps.
Copper catalyzed room temperature lactonization of aromatic C–H bond: a novel and efficient approach for the synthesis of dibenzopyranones
作者:Raju Singha、Shubhendu Dhara、Munmun Ghosh、Jayanta K. Ray
DOI:10.1039/c4ra13665a
日期:——
A novel and efficient methodology has been developed for the intramolecular aryl C–H oxidative lactonization of 2-arylbenzaldehyde using a low-cost CuCl catalyst and TBHP as the oxidant at room temperature.
Cobalt/peroxymonosulfate (Co/PMS) system is an efficient advanced oxidation process (AOP) for degradation of organic pollutants in wastewater, however, has limitations in organic synthesis. Herein, we employ a Co/PMS system to the preparation of biaryl lactones by the valorization of 2-aryl aromatic acids via intramolecular O-H/C-X oxidative coupling. This system exhibits intriguing advantages, such
Oxidant-Free C(sp<sup>2</sup>)–H Functionalization/C–O Bond Formation: A Kolbe Oxidative Cyclization Process
作者:Lei Zhang、Zhenxing Zhang、Junting Hong、Jian Yu、Jianning Zhang、Fanyang Mo
DOI:10.1021/acs.joc.8b00089
日期:2018.3.16
An anodic oxidation/cyclization of 2-arylbenzoic acids for the synthesis of dibenzopyranones has been developed. The reaction proceeds at room temperature with no oxidant or electrolyte required and exhibits a high atom economy with H-2 being the only byproduct. A series of dibenzopyranones was obtained in good to excellent yields. Urolithins A, B, and C are formally synthesized by adopting this method as a key step to demonstrate its synthetic utility.