Synthesis of Bridged Azacycles and Propellanes via Nitrene/Alkyne Cascades
作者:Qinxuan Wang、Jeremy A. May
DOI:10.1021/acs.orglett.0c00798
日期:2020.4.17
nitrene tether showed that 7-membered rings were the maximum ring size to be formed by nitrene attack on the alkyne. Examples incorporating stereocenters on the carbonazidate’s tether induced diasteroselectivity in the formation of the bridgedring and two new stereocenters. Additionally, propellanes containing aminals, hemiaminals, and thioaminals formed from the bridged azacycles in the same reaction via
Carbene cascades for the formation of bridged polycyclic rings
作者:Santa Jansone-Popova、Phong Q. Le、Jeremy A. May
DOI:10.1016/j.tet.2014.03.060
日期:2014.7
A general strategy to synthesize bridged polycyclic molecules is presented. The synthesis is accomplished via a cascade reaction initiated by rhodium carbene formation. Subsequent intramolecular reaction with an alkyne is then followed by a transannular C–H bond insertion. A rationale for prediction of the major structural isomer that is formed is described and applied to a wide variety of substrates
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