Palladium-Catalyzed [5 + 1] Annulation of Salicylic Acid Derivatives and Propargylic Carbonates
作者:Kazuya Sato、Yohei Ogiwara、Norio Sakai
DOI:10.1246/bcsj.20200199
日期:2020.12.15
A palladium-catalyzed annulation reaction between salicylicacid derivatives and propargylic carbonates via the cleavage of a propargylic carbon–oxygen bond is described. This rare annulation react...
Redox‐Neutral Manganese(I)‐Catalyzed C−H Activation: Traceless Directing Group Enabled Regioselective Annulation
作者:Qingquan Lu、Steffen Greßies、Sara Cembellín、Felix J. R. Klauck、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201707396
日期:2017.10.2
groups (TDGs) are used to promote the redox‐neutral MnI‐catalyzed regioselectivesynthesis of N‐heterocycles. Alkyne coupling partners bearing a traceless directing group, which serves as both the chelator and internal oxidant, were used to control the regioselectivity of the annulation reactions. This operationally simple approach is highly effective with previously challenging unsymmetrical alkyne
Manganese(I)-Catalyzed Regioselective C−H Allenylation: Direct Access to 2-Allenylindoles
作者:Qingquan Lu、Steffen Greßies、Felix J. R. Klauck、Frank Glorius
DOI:10.1002/anie.201701767
日期:2017.6.1
-catalyzed regioselectiveC-H allenylation is reported that allows a broad range of 2-allenylindoles to be synthesized regioselectively on a gram scale under simple conditions. Notably, a highly efficient chirality transfer was observed (up to 93 % ee) in this transformation. This procedure was further found to allow, for the first time, the direct preparation of ketones by MnI -catalyzed C-H activation