Enantioselective Synthesis of Dihydropyrazoles by Palladium/Xu‐Phos‐Catalyzed Alleneamination of β, γ‐Unsaturated Hydrazones with Propargylic Acetates
作者:Shuting Zhang、Shuaijie Wu、Qiang Wang、Shiji Xu、Ying Han、Chao-Guo Yan、Junliang Zhang、Lei Wang
DOI:10.1002/anie.202300309
日期:——
A new robust palladium-catalyzed enantioselective alleneamination reaction of β,γ-unsaturated hydrazones with propargylic acetates is described. The salient features of this reaction include general substrate scope, well functional group tolerance, good yields and high enantioselectivities.
Synthesis of Multisubstituted Allenes by Palladium-Catalyzed Carboetherification of β,γ-Unsaturated Ketoximes with Propargylic Acetates
作者:Shuaijie Wu、Shuting Zhang、Jing Sun、Ying Han、Yidong Wang、Chao-Guo Yan、Lei Wang
DOI:10.1021/acs.orglett.3c01561
日期:2023.6.30
A highly efficient Pd-catalyzed carboetherification reaction of β,γ-unsaturated ketoximes with propargylic acetates is demonstrated. This method provides a practical protocol for accessing the incorporation of an allene moiety into 3,5-disubstituted and 3,5,5-trisubstituted isoxazolines. The salient features of this transformation include a broad substrate scope, good functional group tolerance, an
Rhodium-Catalyzed Carbonylation of Cyclopropyl Substituted Propargyl Esters: A Tandem 1,3-Acyloxy Migration [5 + 1] Cycloaddition
作者:Dongxu Shu、Xiaoxun Li、Min Zhang、Patrick J. Robichaux、Ilia A. Guzei、Weiping Tang
DOI:10.1021/jo300973r
日期:2012.8.3
We have developed two different types of tandem reactions for the synthesis of highly functionalized cyclohexenones from cyclopropyl substituted propargyl esters. Both reactions were initiated by rhodium-catalyzed Saucy-Marbet 1,3-acyloxy migration. The resulting cyclopropyl substituted allenes derived from acyloxy migration then underwent [5 + 1] cycloaddition with CO. The acyloxy group not only eased the access to allene intermediates but also provided a handle for further selective functionalizations.