Catalytic Asymmetric Conjugate Addition of Nitroalkanes to Cycloalkenones
作者:Stephen Hanessian、Vinh Pham
DOI:10.1021/ol000170g
日期:2000.9.1
Nitroalkanes add to cyclic and acyclic enones in an enantioselective manner in the presence of catalytic quantities of L-proline and trans-2,5-dimethylpiperazine as excess additive.
Bifunctional Heterogeneous Catalysis of Silica-Alumina-Supported Tertiary Amines with Controlled Acid-Base Interactions for Efficient 1,4-Addition Reactions
We report the first tunable bifunctional surface of silica–alumina‐supported tertiary amines (SA–NEt2) active for catalytic 1,4‐addition reactions of nitroalkanes and thiols to electron‐deficient alkenes. The 1,4‐addition reaction of nitroalkanes to electron‐deficient alkenes is one of the most useful carbon–carbon bond‐forming reactions and applicable toward a wide range of organic syntheses. The
The Michael reaction of nitroalkanes with conjugated enones in aqueous media
作者:Roberto Ballini、Giovanna Bosica
DOI:10.1016/0040-4039(96)01816-3
日期:1996.10
The Michaelreaction of various nitroalkanes with conjugatedenones can be performed in NaOH 0.025 M and in the presence of cetyltrimethylammonium chloride (CTACl) as cationic surfactant, without any organic solvent. Good yields of the products are obtained even with hindered starting materials.
Unusual regioselectivity in Pd(0)-catalyzed coupling of allylic monoacetates and nitroalkanes: one-pot isomerization–alkylation
作者:Pasha M. Khan、Kirpal S. Bisht
DOI:10.1016/j.tetlet.2010.01.025
日期:2010.3
A hitherto unknown palladium-catalyzed reaction of nitroalkanes with hydroxy allylic acetates is reported. The reaction led to the formation of gamma-nitrocarbonyl Compounds instead of the usual unsaturated nitroalcohol expected upon displacement of the allylic acetate group. (C) 2010 Elsevier Ltd. All rights reserved.
Asymmetric conjugate addition of nitroalkanes to enones with a chiral α-aminophosphonate catalyst
Chiral diethyl (2R)-tetrahydropyrro-2-ylphosphonate is an effective catalyst for the Michael addition of nitroalkanes to alpha,beta-unsaturated ketones. This Study revealed that the hydrate salt of this alpha-aminophosphonate was found to be a better catalytic species. Moderate to high enantioselectivities were achieved in reactions that tolerate various nitroalkanes and enones in the presence of low loading of both catalyst ( 10 mol %) and bulk base (25 mol %). (C) 2008 Published by Elsevier Ltd.