Synthesis of Polysubstituted 2‐Naphthols by Palladium‐Catalyzed Intramolecular Arylation/Aromatization Cascade
作者:Jinhui Cai、Zhen‐Kai Wang、Yun‐Hao Zhang、Fei Yao、Xu‐Dong Hu、Wen‐Bo Liu
DOI:10.1002/adsc.201901573
日期:2020.3.17
A palladium‐catalyzed intramolecular α‐arylation and defluorinative aromatization strategy for the synthesis of polysubstituted 2‐naphthols is reported. With ortho‐bromobenzyl‐substituted α‐fluoroketones as the substrates and palladium acetate/triphenylphosphine as the catalyst, this method features good functional group tolerance, readily available catalyst and starting materials, and high yields
报道了钯催化的分子内α-芳基化和脱氟芳构化策略,用于合成多取代的2-萘酚。该方法以邻溴苄基取代的α-氟酮为底物,并以乙酸钯/三苯膦为催化剂,具有良好的官能团耐受性,易于获得的催化剂和起始原料以及高收率的特点。该策略的应用通过合成有用的结构单元(例如,石脑油[2,3- b ]呋喃,萘酚AS-D和配体/催化剂)得到证明。
Cyano or acyl group migration by consecutive homolytic addition and β-fission
作者:Athelstan L. J. Beckwith、Dennis M. O'Shea、Sendaba Gerba、Steven W. Westwood
DOI:10.1039/c39870000666
日期:——
Suitablyconstitutedaryl and alkylradicals readily rearrange by 1,2- or 1,4-acyl or cyanomigration.
A cationic gold(l) complex with a semihollow-shaped trialkynylphosphine catalyzed 5-exo-dig and 6-endo-dig cyclizations of various internal alkynic beta-keto esters, showing a marked advantage over a gold(I)-PPh3 complex with respect to the rates of the reactions and the product yields. It is proposed that the gold-bound alkynic substrate in a catalytic pocket must be somewhat folded and that such a steric effect makes the carbon-carbon bond formation entropically more favorable.
O-Arylation versus C-Arylation: Copper-Catalyzed Intramolecular Coupling of Aryl Bromides with 1,3-Dicarbonyls
作者:Yewen Fang、Chaozhong Li
DOI:10.1021/jo060747t
日期:2006.8.1
The copper-catalyzed intramolecular coupling of aryl bromides with 1,3-dicarbonyls via a six-membered ring closure was examined. With CuI (10 mol %) as the catalyst, N,N'-dimethylethylenediamine as the ligand, and Cs2CO3 as the base, the reactions of alpha-(2-bromobenzyl)-beta-keto esters in THF at refluxing temperature afforded the corresponding substituted 4H-1-benzopyrans in high yields via O-arylation. On the other hand, the reactions of delta-(2-bromophenyl)-beta-keto esters in refluxing dioxane led to the formation of 3,4-dihydronaphthalen-2(1H)-one derivatives via C-arylation.
BECKWITH A. L. J.; OSHEA D. M.; GERBA S.; WESTWOOD S. W., J. CHEM. SOC. CHEM. COMMUN.,(1987) N 9, 666-667
作者:BECKWITH A. L. J.、 OSHEA D. M.、 GERBA S.、 WESTWOOD S. W.