Gold-Catalyzed Annulation/Fragmentation: Formation of Free Gold Carbenes by Retro-Cyclopropanation
摘要:
The gold(I)-catalyzed cyclization of 1-(prop-2-yn-1-yl)-2-alkenylbenzenes substituted at the benzylic position with OR groups gives 1,3-disubstituted naphthalenes with concomitant fragmentation of the alkene. One of these annulations proceeds by a retro-cyclopropanation that leads to free gold(I) carbenes.
Experiment and Theory of Bimetallic Pd-Catalyzed α-Arylation and Annulation for Naphthalene Synthesis
作者:Chloe C. Ence、Erin E. Martinez、Samuel R. Himes、S. Hadi Nazari、Mariur Rodriguez Moreno、Manase F. Matu、Samantha G. Larsen、Kyle J. Gassaway、Gabriel A. Valdivia-Berroeta、Stacey J. Smith、Daniel H. Ess、David J. Michaelis
DOI:10.1021/acscatal.1c02731
日期:2021.8.20
We report the synthesis of bimetallic Pd(I) and Pd(II) complexes with bidentate 2-phosphinoimidazole ligands and their catalytic activity to generate substituted naphthalenes. This process involves the coupling of an aryl iodide and 2 equiv of a ketone via sequential ketone α-arylation and then annulation to generate disubstituted and tetrasubstituted naphthalenes in a regioselective manner. Excellent
Benzotriazole-Assisted Aromatic Ring Annulation: Efficient and General Syntheses of Polysubstituted Naphthalenes and Phenanthrenes
作者:Alan R. Katritzky、Guifen Zhang、Linghong Xie
DOI:10.1021/jo961597x
日期:1997.2.1
4-addition to alpha,beta-unsaturated aldehydes and ketones. Intramolecular cyclization of the products, induced by acetic acid-hydrobromic acid or polyphosphoric acid (PPA), followed by simultaneous dehydration and debenzotriazolylation furnishes a wide range of polysubstituted naphthalenes 7a-f and of phenanthrenes 9 and 11 in moderate to good yields in one-pot procedures. If compounds 1 are first lithiated