Synthesis of <scp>d</scp>-Abrines by Palladium-catalyzed Reaction of ortho-Iodoanilines with <i>N</i>-Boc-<i>N</i>-methylalanyl-substituted Acetaldehyde and Acetylene
作者:Paulami Danner、Marius Morkunas、Martin E. Maier
DOI:10.1021/ol4009409
日期:2013.5.17
N-Boc-N-methyl--tryptophans (abrine derivatives) was developed that relies on the palladium-catalyzed annulation of ortho-iodoanilines 12 with either N-Boc-N-methyl-propargylglycine 16 or aldehyde 11. Both 11 and 16 can be prepared from d-serine. An alternative route to propargylglycine 16 utilizes an enantioselective propargylation reaction of glycine imine 17.
Directing the Cation Recognition Ability of Calix[4]arenes toward Asymmetric Phase-Transfer Catalysis
作者:Nicola Alessandro De Simone、Rosaria Schettini、Carmen Talotta、Carmine Gaeta、Irene Izzo、Giorgio Della Sala、Placido Neri
DOI:10.1002/ejoc.201700912
日期:2017.10.10
the first time in asymmetric phase-transfercatalysis. The binding affinities of a series of chiral α-methylbenzylamine-derived calix[4]arene-amides toward Na+ guest have been determined by 1H NMR spectroscopic titration experiments. The good apparent association constant values are consistent with the macrocycles' catalytic efficiency in the asymmetric alkylation reaction of N-(diphenylmethylene)glycine