Nickel-Catalyzed Favorskii-Type Rearrangement of Cyclobutanone Oxime Esters to Cyclopropanecarbonitriles
作者:Ping Fang、Tian-Sheng Mei、Bin Shuai
DOI:10.1055/s-0039-1690872
日期:2021.10
A nickel-catalyzed base-promoted rearrangement of cyclobutanone oxime esters to cyclopropanecarbonitriles was developed. The ring opening of cyclobutanone oxime esters occurs at the sterically less hindered side. A base-promoted nickelacyclobutane intermediate, formed in situ, is assumed to be involved in the formation of the product.
Nucleophilic substitutions of 1-alkenylcyclopropyl esters and 1-alkynylcyclopropyl chlorides catalyzed by palladium(0)
作者:Andreas Stolle、Jean Ollivier、Pier Paolo Piras、Jacques Salaun、Armin De Meijere
DOI:10.1021/ja00037a006
日期:1992.5
dimethylallyl acetates 19 and 22, respectively. Use of chiral phosphines as ligands in the palladium catalyst can provide optically active methylenecyclopropane derivatives. With phenyl-, methyl-, and even n-butylzinc chloride as nucleophiles, the reaction apparently proceeds with initial transfer of the organic residue to palladium, followed by reductive elimination entailing tertiary substitution on the cyclopropane
intramolecular additions of pronucleophiles to methylenecyclopropanes proceeded smoothly in the presence of catalytic amounts of Pd(PPh3)4, affording hydrocarbonation products in good to high yields. The ringopening of methylenecyclopropanes mainly occurred at the distal position to the exomethylene. In some cases, proximal bond cleavage also took place. The mode of ringopening depended upon both the
Herein, we report on selectivity control in C–H activations with alkylidenecyclopropanes (ACPs) for the chemo-selective assembly of cyclopropanes or dienes. Thus, unprecedented rhodaelectro-catalyzed C–H activations were realized with diversely decorated ACPs with a wide substrate scope and electricity as the sole oxidant.
Regioselective palladium(0) catalyzed reduction of 1-alkenylcyclopropyl esters as equivalent of the wittig reaction §
作者:Jean Ollivier、Pier P. Piras、Andreas Stolle、Pierre Aufranc、Armin de Meijere、Jacques Salaün
DOI:10.1016/s0040-4039(00)92074-4
日期:1992.6
Palladium(0) catalyzed reduction of 1-(1-alkenyl)- and 1-(1-cycloalkenyl)cyclopropyl esters provides an useful alternative to the Wittig reactions of cyclopropylidenetriphenylphosphorane or of cyclopropanonehemiacetals and an easy route to strained methylenecyclopropane derivatives.