Directing Selectivity to Aldehydes, Alcohols, or Esters with Diphobane Ligands in Pd-Catalyzed Alkene Carbonylations
作者:Dillon W. P. Tay、James D. Nobbs、Srinivasulu Aitipamula、George J. P. Britovsek、Martin van Meurs
DOI:10.1021/acs.organomet.1c00228
日期:2021.6.28
trifluoromethylphenylene-bridged diphobane L1 with an electron-withdrawing substituent, lead to ester products via alkoxycarbonylation, whereas BCOPE gives predominantly alcohol products (n-nonanol and isomers) via reductive hydroformylation. The preference of BCOPE for reductive hydroformylation is also seen in the hydroformylation of 1-hexene in diglyme as the solvent, producing heptanol as the major product, whereas
An Improved Method for the Bromination of Metalated Haloarenes via Lithium, Zinc Transmetalation: A Convenient Synthesis of 1,2-Dibromoarenes
作者:Karsten Menzel、Ethan L. Fisher、Lisa DiMichele、Doug E. Frantz、Todd D. Nelson、Michael H. Kress
DOI:10.1021/jo052515k
日期:2006.3.1
A facile protocol for the synthesis of 1,2-dibromoarenes is described. A standard ortho-lithiation/bromination procedure, when applied to bromoarenes, resulted in poor yields of the corresponding 1,2-dibromoarenes (13−62% yield). However, transmetalation of the transient aryllithium intermediate to an arylzinc species with ZnCl2, followed by bromination, resulted in dramatically improved yields of
9-Stannafluorenes: 1,4-Dimetal Equivalents for Aromatic Annulation by Double Cross-Coupling
作者:Ikuhiro Nagao、Masaki Shimizu、Tamejiro Hiyama
DOI:10.1002/anie.200903779
日期:2009.9.28
Double or nothing! A straightforward and high‐yielding approach to a variety of polycyclic aromatic hydrocarbons has been achieved through palladium‐catalyzed annulation of 9,9‐dimethyl‐9‐stannafluorenes and dithienostannole with 1,2‐dihaloarenes (see scheme). In addition, 1,1‐dibromo‐1‐alkenes can also be applied to this annulation to produce dibenzofulvenes in excellent yields.