Gold(<scp>i</scp>)-catalyzed formation of dihydroquinolines and indoles from N-aminophenyl propargyl malonates
作者:Colombe Gronnier、Yann Odabachian、Fabien Gagosz
DOI:10.1039/c0cc00033g
日期:——
The use of [XPhosAu(NCMe)]SbF(6) in nitromethane at 100 degrees C allows the rapid and efficient formation of variously substituted dihydroquinolines, which can be subsequently converted into indoles by a rare photochemical rearrangement.
作者:Daniel A. Clark、Joseph R. Clark、Steven T. Diver
DOI:10.1021/ol800523j
日期:2008.5.1
Allyl alcohols and their homologues were used in the enyne cross metathesis to prepare hydroxy-functionalized dienes. An isomerization was found to occur under prolonged heating, and a method for conversion to ( E)-diene product is also reported.
[reaction: see text] This paper describes a novel method to synthesize a quinoline backbone by incorporating allenyl cations into a catalytic intramolecular Friedel-Crafts reaction. The initial products were isomerized and aromatized upon treatment with acid and base, respectively, to give quinolines. The basic concept also proved to be promising for 1-benzazepine, 1-benzazocine, or isoquinoline synthesis
hydrocyanation of terminal alkynes is described. A tosylamide functionality at the propargyl position was the most suitable group for controlling the regiochemistry for CCN bond formation as well as rate enhancement. A gram-scale synthesis was achieved by minimizing the catalyst loading to 2 mol%. The major HCN adduct could be transformed to the corresponding indoline through construction of a benzylic quaternary
Mild Isomerization of Conjugated Dienes Using Co-Mediated Hydrogen Atom Transfer
作者:Kyle R. Delgado、Dustin D. Youmans、Steven T. Diver
DOI:10.1021/acs.orglett.9b04594
日期:2020.1.17
A mild and high yielding rearrangement of 1,3-disubstituted-1,3-dienes to 1,1,4-trisubstituted-1,3-dienes using a cobaloxime catalyst and a silane cocatalyst is reported. Chiral centers near the conjugated diene were not racemized. Deuterium labeling studies are consistent with a hydrogen atom transfer mechanism, and radical intermediates were found to be accessible due to the observed ring opening