alumina is found to promote the conjugate addition of indoles to nitroalkenes in solventlessconditions at 60 °C. Nitroalkenes can be replaced by nitro alcohols that are converted into nitroolefins under the reaction conditions. Alternatively, a tandem nitroaldol-dehydration allows the utilization of nitroalkanes and aldehydes as remote precursors of reactive nitroalkenes in a ‘one–pot’ synthesis of 3-substituted
The reaction of α,β-unsaturated nitro compounds with aldehydes or electron deficient olefins, in the presence of a base provides a simple method for the preparation of α-substituted allylic nitro compounds. The initially formed allylic carbanion reacts regioselectively at the position α to the nitro group. The products formed, γ,δ-unsaturated β-nitro alcohols 2 and δ,ε-unsaturated γ-nitro ketones, esters, nitriles, and sulfones 3, can serve as useful synthetic intermediates.
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
PALLADIUM CATALYZED SYNTHESIS OF ALLYLIC SULFONES. UTILIZATION OF α-NITRO OLEFINS AS ALLYLIC NITRO COMPOUNDS
作者:Rui Tamura、Koji Hayashi、Masato Kakihana、Masanori Tsuji、Daihei Oda
DOI:10.1246/cl.1985.229
日期:1985.2.5
α-Nitro olefins reacted with sodium benzenesulfinate in the presence of tertiary amine and palladium(0) catalyst to afford allylic sulfones. The competition experiment showed that relative rate of the sulfonylation of an α-nitro olefin to that of the corresponding allylic acetate was about 2.2.
Disclosed herein are embodiments of a method for making substituted compounds with specific and selectable regiochemistry. Also disclosed are compounds made by the method. The method may comprise contacting a compound having a formula I
with a compound according to formula II
in the presence of a Lewis acid to form a phenol compound according to formula III and/or a benzofuranone compound according to formula IV
本文公开了一种制造具有特定和可选择区域化学性质的取代化合物的方法的实施例。还公开了用该方法制得的化合物。该方法可包括将具有式 I 的化合物
与根据式 II 的化合物接触
在路易斯酸存在下,生成根据式 III 的苯酚化合物和/或根据式 IV 的苯并呋喃酮化合物