Iodine mediated a simple strategy for the synthesis of β,γ-unsaturated-α-ketoesters and its application for the synthesis of 4,5-dihydropyrazole derivatives
AbstractNovel and efficient method for the synthesis of a series of β,γ-unsaturated-α-ketoesters under mild conditions was developed. This one-step protocol was achieved by the reaction of electron-rich aromatic aldehydes and pyruvates in the presence of 10 mol% of molecular iodine in solvent-free condition at 80 °C temperature. A wide variety of substrates bearing electron releasing groups on aromatic
Construction of Bicyclo[3.2.1]octanes with Four Stereogenic Centers by Organocatalytic Domino Michael/Aldol Reaction
作者:A. Lefranc、L. Gremaud、A. Alexakis
DOI:10.1021/ol502171h
日期:2014.10.17
An enantio- and diastereoselective organocatalytic domino Michael/Aldol reaction for the direct preparation of synthetically and medicinally relevant bicyclo[3.2.1]octane derivatives with four stereogenic centers, including twoquaternary carbons, has been described. The reaction tolerates a large variety of substituents on β,γ-unsaturated 1,2-ketoesters and cyclic 1,3-ketoesters. It allows for the