An Ethynyl-Substituted 1,5,7-Trimethyl-3-azabicyclo[3.3.1]nonan-2-one as a Versatile Precursor for Chiral Templates and Chiral Photocatalysts
作者:Thorsten Bach、Felix Voss
DOI:10.1055/s-0029-1219920
日期:2010.6
The title compound was synthesized and separated into its enantiomers. The enantiomerically pure alkyne was ligated to several aryl azides and aryl halides. The resulting 7-substituted 1,5,7-trimethyl-3-azabicyclo[3.3.1]nonan-2-ones were used either as chiral templates in the intramolecular [2+2] photocycloaddition of 4-allyloxyquinolone (up to 72% ee) or as a chiral photocatalyst for the intramolecular [2+2] photocycloaddition of 4-(3-butenyloxy)quinolone (up to 79% ee with 10 mol% catalyst).
A terminal alkyne was prepared, which is linked by a carbon-carbon bond to a conformationally restricted, U-shaped chiral lactam, that is, more precisely, to carbon atom C7 of 1,5,7-trimethyl-3-azabicyclo[3.3.1]nonan-2-one. The alkyne was connected to various ligands (bipyridine, terpyridine, pybox) by Sonogashira cross-coupling with the respective bromides or triflates. The resulting products were
Enantioselective [4+4] photodimerization of anthracene-2,6-dicarboxylic acid mediated by a C<sub>2</sub>-symmetric chiral template
作者:Mark M. Maturi、Gaku Fukuhara、Koichiro Tanaka、Yuko Kawanami、Tadashi Mori、Yoshihisa Inoue、Thorsten Bach
DOI:10.1039/c5cc09107a
日期:——
A chiral template was shown to bind the title compound by hydrogen bonding resulting in enantioselectivities of up to 55% enantiomeric excess (ee) in the [4+4] anthracene photodimerization.