Hydroalkoxylation of Unactivated Olefins with Carbon Radicals and Carbocation Species as Key Intermediates
摘要:
A unique Markovnikov hydroalkoxylation of unactivated olefins with a cobalt complex, silane, and N-fluoropyridinium salt is reported. Further optimization of reaction conditions yielded high functional group tolerance and versatility of alcoholic solvent employed, including methanol, i-propanol, and t-butanol. Use of trifluorotoluene as a solvent made the use of alcohol in stoichiometric amount possible. Mechanistic insight into this novel catalytic system is also discussed. Experimental results suggest that catalysis involves both carbon radical and carbocation intermediates.
Cationic Iridium Complex-Catalyzed Intermolecular Hydroalkylation of Unactivated Alkenes with 1,3-Diketones
作者:Ryo Takeuchi、Jun Sagawa、Masaki Fujii
DOI:10.1021/acs.orglett.8b03975
日期:2019.2.1
of unactivated terminal alkenes with 1,3-diketones under neutral conditions has been achieved using a cationic iridium catalyst. An active C–H bond of 2,4-pentadione (2a) added to 1-octene (1a) under refluxing DCE to give a Markovnikov product in 88% yield. A broad scope of alkenes and 1,3-diketones was observed. The products were easily converted to heterocycles. This reaction provides a new method