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
Visible‐Light‐Driven Photocatalyst‐Free Preparation of (
<i>Z)</i>
β‐Nitroacrylate Isomers
作者:Muhammad Ehtisham Ibraheem Khan、Lorenzo Di Terlizzi、Stefano Protti、Alessandro Palmieri
DOI:10.1002/ejoc.202200635
日期:2022.7.14
A new easy and efficient protocol for synthesizing poorly available (Z) β-nitroacrylates through visible-light driven conversion of the corresponding (E) isomers is reported. The process can be profitably performed under both batch and flow conditions.
报道了一种通过相应 ( E ) 异构体的可见光驱动转换来合成低效 ( Z ) β-硝基丙烯酸酯的简单有效的新方案。该过程可以在分批和流动条件下有利地进行。
REGIOSELECTIVE SYNTHESIS OF SUBSTITUTED COMPOUNDS
申请人:Oregon State University
公开号:US20230117370A1
公开(公告)日:2023-04-20
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
Asymmetric Bioreductions of β-Nitro Acrylates as a Route to Chiral β<sup>2</sup>-Amino Acids
作者:Magdalena A. Swiderska、Jon D. Stewart
DOI:10.1021/ol062612f
日期:2006.12.1
Reductions of beta-nitroacrylates by Saccharomyces carlsbergensis old yellow enzyme is the key step in a concise route to optically active beta(2)-amino acids. The enzymatic reductions occur with 87 - 96% ee, with larger substrates providing greater stereoselectivities. This work extends enantioselective enzymatic alkene reductions to include acyclic systems with weakly coordinating substituents.
Stereoselective Synthesis of Functionalized Chiral 2-Nitrocyclohexanecarboxylic Esters<i>via</i>Catalytic Dienamine Addition to β-Substituted β-Nitroacrylates
AbstractA metal‐free stereoselective catalytic addition of in situ generated dienamine to β‐nitroacrylates has been developed. Starting from simple α,β‐unsaturated ketones, highly functionalized chiral β‐nitrocyclohexanecarboxylic esters were obtained in a single step, in good yields and up to 98% ee. By an unprecedented mechanistic pathway, starting from the synthetically readily available E‐nitroacrylate, the present methodology allowed us to obtain as major product the isomer bearing a cis relative disposition between the nitro and the ester groups, which is not accessible via a classical Diels–Alder reaction.magnified image