Room Temperature Catalyst System for the Hydroarylation of Olefins
作者:Siu Yin Lee、Alexander Villani-Gale、Chad C. Eichman
DOI:10.1021/acs.orglett.6b02492
日期:2016.10.7
A simple protocol for the hydroarylation of olefins to yield diarylmethine products is described. A Friedel–Crafts-type synthetic strategy allows direct access to biorelevant products in high atom efficiency. A combination of substoichiometric amounts of TMSCl and ZnBr2 promotes a rapid hydroarylation process at ambient temperature. The method is high yielding and is amenable to scale-up protocols
Synthesis of salicylaldehydes bearing bulky substituents in the positions 3 and 5
作者:A. I. Kochnev、I. I. Oleynik、I. V. Oleynik、S. S. Ivanchev、G. A. Tolstikov
DOI:10.1007/s11172-007-0170-5
日期:2007.6
4-disubstituted phenols with paraformaldehyde in the presence of SnCl4 and 2,6-lutidine afforded a number of new salicylaldehydes, containing bulky substituents (tert-butyl, 1-phenylethyl, 1-(4-tert-butylphenyl)ethyl, α-cumyl, and trityl) in the positions 3 and 5.
[reaction: see text] 1,1-Diarylalkanes are easily synthesized by CH-functionalization reactions of electron-rich arenes and heteroarenes with styrenes in the presence of FeCl(3) as catalyst.
A simple Lewis acid induced reaction of phenols with electrophiles: Synthesis of functionalized 4<i>H</i>-chromenes and <i>ortho</i>-benzylphenols
作者:Chinnabattigalla Sreenivasulu、Ditto Abraham Thadathil、Sumit Pal、Satyanarayana Gedu
DOI:10.1080/00397911.2019.1689268
日期:2020.1.2
Abstract Lewisacid ZnCl2 promoted cyclization protocol to 4H-chromenes is accomplished, using readily available phenols and acetophenones as starting materials. Interestingly, the process is feasible under the solvent free environment. Synthesis of a variety of 4H-chromenes have been accomplished using this strategy. In addition, this concept is extended to the synthesis of ortho-benzylphenols by
HBF<sub>4</sub>- and AgBF<sub>4</sub>-Catalyzed <i>ortho</i>-Alkylation of Diarylamines and Phenols
作者:Christian K. Rank、Bünyamin Özkaya、Frederic W. Patureau
DOI:10.1021/acs.orglett.9b02470
日期:2019.9.6
A silver-tetrafluoroborate- or HBF4-catalyzed ortho-alkylation reaction of phenols and diarylamines with styrenes has been explored. A broad substrate scope is presented as well as mechanistic experiments and discussion.