Conjugate addition of nitroalkanes to α,β-unsaturated carbonyl compounds occurs in the presence of basic alumina without a solvent. Yields are fair to good also with substrates which are acid or base sensitive.
Asymmetric Organocatalytic Sequential Reaction of Structurally Complex Cyclic Hemiacetals and Functionalized Nitro-olefins To Synthesize Diverse Heterocycles
作者:Jun-Ping Pei、Ying-Han Chen、Yan-Kai Liu
DOI:10.1021/acs.orglett.8b01386
日期:2018.6.15
Structurally complex cyclic hemiacetals bearing a racemic tetrasubstituted stereocenter have been prepared in a concise manner and were successfully used in an organocatalytic enantioselective sequence to react with functionalized nitro-olefins, providing bicyclic acetal-containing compounds as two separable epimers with excellent stereoselectivity. The reaction showed broad substrate scope, with respect
Catalytic Asymmetric Synthesis of γ-Substituted Vinyl Sulfones
作者:Rosa López、Maitane Zalacain、Claudio Palomo
DOI:10.1002/chem.201003177
日期:2011.2.18
A fast new entry for the stereoselective construction of γ‐substituted vinyl sulfones is presented. The key for success is the use of a readily available chiral secondary amine catalyst that allows the use of base‐sensitive β‐nitroethyl sulfones as masked β‐sulfonyl vinyl anions in conjugateadditions. The method performed in a three‐step one‐pot operation gives access to a great variety of vinyl sulfones
AN EXPEDITIOUS SYNTHESIS OF 3-NITROPROPIONIC ACID AND ITS ETHYL AND METHYL ESTERS
作者:Paulo C. Silva、Jeronimo S. Costa、Vera L. P. Pereira
DOI:10.1081/scc-100000587
日期:2001.1
The synthesis to 3-nitropropionic acid 1 was easily accomplished, in two steps, from commercially available acrolein in 60% yield. The ethyl and methyl esters of 1 were also obtained.
New Rearrangement of Conjugated Cyclic Ene Nitroso O-Trimethylsilyl Acetals: Convenient Synthesis of Dihydro-2H-pyran-3-one and Dihydrofuran-3-one Oximes
The nucleophile-induced rearrangement of cyclic N-alkoxy-N-(silyloxy)enamines was investigated. As a result, a new strategy for the synthesis of β-pyranone and β-furanone derivatives from nitrocompounds is suggested. nitroso acetals - rearrangement - nitrogen heterocycles - 1,2-oxazines - aliphatic nitrocompounds