Synthesis of Substituted Naphthalenes and Carbazoles by the Palladium-Catalyzed Annulation of Internal Alkynes
作者:Qinhua Huang、Richard C. Larock
DOI:10.1021/jo034449x
日期:2003.9.1
An efficient synthesis of highly substituted naphthalenes has been developed by the palladium-catalyzedannulation of a variety of internal alkynes, in which two new carbon-carbon bonds are formed in a single step under relatively mild reaction conditions. This method has also been used to synthesize carbazoles, although a higher reaction temperature is necessary. The process involves arylpalladation
MeOTf-catalyzed formal [4 + 2] annulations of styrene oxides with alkynes leading to polysubstituted naphthalenes through sequential electrophilic cyclization/ring expansion
作者:Song Zou、Zeyu Zhang、Chao Chen、Chanjuan Xi
DOI:10.1016/j.cclet.2021.12.012
日期:2022.6
MeOTf-catalyzed formal [4 + 2] annulation of styrene oxides with alkynes to afford polysubstituted naphthalenes has been realized, which undergoes sequential electrophiliccyclization/ring expansion. A range of substrates were tolerated in the formation of naphthalene derivatives with high regioselectivity in satisfactory yields. The reaction could also be carried out on gram scale.
Annulation of 1-allyl-2-bromobenzene derivatives with internal alkynes using a hydrazone–palladium catalyst afforded polysubstituted naphthalene derivatives in good to high yields.
Naphthalene formation by allylation of zirconaindenes in the ZnX2–Pd(PPh3)4 system
作者:Zheng Duan、Tamotsu Takahashi、Kiyohiko Nakajima
DOI:10.1039/b103674m
日期:——
Zirconaindenes reacted with allyl halides in the presence of ZnX2 ( X= Cl or Br) and a catalytic amount of Pd(PPh3)4 to give naphthalene derivatives in good yield.