In this article, a photoredox protocol for the synthesis of furans via oxidative coupling of olefin generated in situ from cyclopropylketones with ketonic oxygen atom is presented. Moreover, bromination of furans in the presence of overstoichiometric oxidant has been achieved with high regioselectivity.
Trapping the intermediate involved in the intramolecular cyclisation of cyclopropyl ketones. A convenient preparation of open-chain γ-hydroxy ketones
作者:William S. Murphy、Sompong Wattanasin
DOI:10.1016/s0040-4039(00)78730-2
日期:1980.1
The concerted mechanism for the stannic chloride catalysed cyclisation of aryl cyclopropyl ketones is disproved by trapping the intermediate. The reaction provides a facile route to γ-hydroxyketones.
Chalcone-Based Synthesis of Tetrahydropyridazines via Cloke–Wilson-Type Rearrangement-Involved Tandem Reaction between Cyclopropyl Ketones and Hydrazines
作者:Yingfen Meng、Jiayi Gu、Meixiu Xin、Yi Jiang、Zhibo Du、Guoqing Lu、Jiayao Jiang、Albert S. C. Chan、Zhuofeng Ke、Yong Zou
DOI:10.1021/acs.joc.3c02824
日期:2024.2.16
A facile and efficient approach for the synthesis of multisubstituted tetrahydropyridazines starting fromcyclopropylketones and hydrazines has been developed. The transformation is chalcone-based and takes place via a Cloke–Wilson-type rearrangement-involved tandem reaction catalyzed by TfOH in HFIP.
regiodivergent and stereoselective ring-opening isomerization of vinylcyclopropane was developed with cobalt catalysis. Employing the commercially available Xantphos ligand, the reactions afforded exclusively linear-type 1,3-dienes as the products. Interestingly, when switching the ligand to an amido-diphosphine ligand (PNP), branched-type 1,3-dienes were obtained with high regioselectivity and stereoselectivity