One‐Shot Radical Cross Coupling Between Benzyl Alcohols and Alkenyl Halides Using Ni/Ti/Mn System
作者:Takuya Suga、Yuuki Takahashi、Yutaka Ukaji
DOI:10.1002/adsc.202000945
日期:2020.12.22
A “one‐shot” cross coupling between benzyl alcohols and alkenylhalides has been established. A combination of low‐valent Ti‐mediated C−OH homolysis and the prominent chemistry of Ni‐based radical catalysis afforded the desired cross‐coupled product with good efficiency. The reaction proceeded regardless of the electronic property of benzyl alcohols, and Ar−B bond remained intact throughout the reaction
Nickel-catalysed addition of organoboronates to 1,3-dienesElectronic supplementary information (ESI) available: 1H NMR spectra and MS data. See http://www.rsc.org/suppdata/cc/b2/b207185a/
Aryl- and alkenylboronates were found to add to 1,3-dienes in the presence of a catalytic amount of bis(1,5-cyclooctadiene)nickel, where a proton source in combination with a solvent considerably controls the regioselectivity.
The reactions of arylhalides with 2,3,3-trimethyl-4-penten-2-ol in the presence of a palladium catalyst result in prenyl transfer from the alcohol to arylhalidesvia retro-allylation, yielding prenylarenes. Other multisubstituted allyl groups such as the 2,3-dimethyl-2-butenyl group are introduced to aromatic rings.
Synthesis of Tri-, Tetra-, and Pentacarbonyl Derivatives via Ozonolysis of 1,4-Dienes and Cyclization to Polyaromatic Systems
作者:Laura Kersten、Klaus Harms、Gerhard Hilt
DOI:10.1021/jo502308d
日期:2014.12.5
was the synthesis of polyaromatic systems by cyclization of β-polycarbonyls. Useful synthons for β-polycarbonyl derivatives are branched 1,4-dienes generated by cobalt-catalyzed hydrovinylation of terminal alkenes and 2,3-dimethyl-1,3-butadiene. Thus, a series of tri-, tetra-, and pentacarbonyl synthons was successfully synthesized. Subsequently, these synthons were examined in an ozonolysis/cyclization