Ligand-Controlled Regioselective Copper-Catalyzed Trifluoromethylation To Generate (Trifluoromethyl)allenes
作者:Brett R. Ambler、Santosh Peddi、Ryan A. Altman
DOI:10.1021/acs.orglett.5b01027
日期:2015.5.15
report the first example of a Cu-catalyzed trifluoromethylation reaction in which a ligand controls the regiochemical outcome. More specifically, we demonstrate the ability of bipyridyl-derived ligands to control the regioselectivity of the Cu-catalyzed nucleophilic trifluoromethylation reactions of propargyl electrophiles to generate (trifluoromethyl)allenes. This method provides a variety of di-
Gold-Catalyzed Double Spirocyclization of 3-Ene-1,7-diyne Esters to Dispiroheterocycles
作者:Jichao Chen、Zhen Liu、Andrés Felipe León Rojas、Weidong Rao、Philip Wai Hong Chan
DOI:10.1021/acs.orglett.4c00884
日期:2024.4.19
A synthetic method to prepare dispiroheterocycles containing two all-carbon quaternary centers efficiently that relies on the gold(I)-catalyzed doublespirocyclization of 3-ene-1,7-diyneesters is described. The suggested mechanism delineates a rare example of a dispirocyclization featuring two 1,n-acyloxy shifts comprising a 1,3-acyloxy migration and an interrupted 1,5-acyl migration that was achieved