Organocatalytic regiospecific synthesis of 1H-indene-2-carbaldehyde derivatives: suppression of cycloolefin isomerisation by employing sterically demanding catalysts
作者:Hui Mao、Dong Wan Kim、Hun Yi Shin、Choong Eui Song、Jung Woon Yang
DOI:10.1039/c6ob01918h
日期:——
The regiospecific synthesis of 1H-indene-2-carbaldehyde derivatives was achieved through transition-metal-free, reductive cyclisation of ortho-formyl trans-cinnamaldehydes with Hantzsch ester in the presence of an aminocatalyst. In particular, cycloolefin isomerisation of the resulting products could be inhibited efficiently by the introduction of a stericallydemanding stereo-defined aminocatalyst
Enantioselective Organo-Singly Occupied Molecular Orbital Catalysis: The Carbo-oxidation of Styrenes
作者:Thomas H. Graham、Casey M. Jones、Nathan T. Jui、David W. C. MacMillan
DOI:10.1021/ja8075633
日期:2008.12.10
The first enantioselective organocatalytic carbo-oxidation of styrenes has been accomplished using singly occupied molecular orbital (SOMO) catalysis. Geometrically constrained radical cations are generated from the one-electron oxidation of enamines formed from the condensation of aldehydes with a secondaryamine catalyst. These SOMO-activated radical cations are susceptible to attack by commercially