Organocatalytic Asymmetric Tamura Cycloaddition with α- Branched Nitroolefins: Synthesis of Functionalized 1-Tetralones
作者:Utpal Nath、Subhas Chandra Pan
DOI:10.1021/acs.joc.6b03020
日期:2017.3.17
A new catalyticasymmetricTamuracycloaddition with nitroolefins was developed. This demonstration of the reaction of α-branched nitroolefins with homophthalic anhydrides delivers highly functionalized 1-tetralone compounds. With bifunctional squaramide catalyst, the desired tetralone products are obtained with high enantioselectivity and good diastereoselectivity.
Facile and Highly Stereoselective One-Pot Synthesis of Either (<i>E</i>)- or (<i>Z</i>)-Nitro Alkenes
作者:Stefania Fioravanti、Lucio Pellacani、Paolo A. Tardella、Maria Cecilia Vergari
DOI:10.1021/ol800224k
日期:2008.4.1
of catalytic amounts of piperidine over 4 A molecular sieves. Simply by changing reaction conditions (solvent and temperature) it is possible to control the stereochemical outcome of the reactions, obtaining pure (E)- and (Z)-nitro alkenes in high to excellent yields. The role of molecular sieves on the stereochemical control seems crucial in addition to that of piperidine, especially for the synthesis