Probing the Mechanism of Allylic Substitution of Morita–Baylis–Hillman Acetates (MBHAs) by using the Silyl Phosphonite Paradigm: Scope and Applications of a Versatile Transformation
作者:Maria Kalyva、Alexandros L. Zografos、Era Kapourani、Evaggelos Giambazolias、Laurent Devel、Athanasios Papakyriakou、Vincent Dive、Yannis G. Lazarou、Dimitris Georgiadis
DOI:10.1002/chem.201405626
日期:2015.2.16
using 31P NMR spectroscopy revealedunexpected reactivity differences between ester and nitrile derivatives. These kinetic profiles and DFT calculations support a mechanistic scenario in which observed differences can be explained from the “lateness” of transition states. In addition, we provide experimental evidence suggesting that enolates due to initial P‐Michaeladdition are not formed. Based on
AP 甲硅烷基膦酸酯和森田-的Baylis-希尔曼乙酸盐(MBHAs)之间C键形成反应探索作为向医药相关β-carboxyphosphinic结构基序的通用的替代方案。使用31记录的不同取代的MBHA转化为次膦酸9或14的转化率P NMR光谱显示酯和腈衍生物之间的反应性差异出乎意料。这些动力学曲线和DFT计算支持了一种机械方案,其中可以从过渡态的“迟缓”解释观察到的差异。此外,我们提供的实验证据表明,由于最初的P-Michael加成而形成的烯醇不形成。基于拟议的机械情景结合DFT计算,对E / Z的解释提出了酯和腈之间的立体选择性差异。提出了由这种转变产生的合成机会,该机会涉及几种合成的反复变化的膦基结构单元的制备,而这些结构单元通过经典的P-Michael合成路线的访问并不简单。
Direct Decarboxylative Allylation and Arylation of Aliphatic Carboxylic Acids Using Flavin‐Mediated Photoredox Catalysis
作者:Nieves P. Ramirez、Teresa Lana‐Villarreal、Jose C. Gonzalez‐Gomez
DOI:10.1002/ejoc.201900888
日期:2020.3.15
This work was generously supported by the Spanish Ministerio de Economia y Competitividad (CTQ2017–88171-P) and the Generalitat Valenciana (AICO/2017/007). N. P. R. thanks to Instituto de Sintesis Organica for financial support.
这项工作得到了西班牙经济与竞争部长 (CTQ2017-88171-P) 和巴伦西亚政府 (AICO/2017/007) 的慷慨支持。NPR 感谢 Instituto de Sintesis Organica 的财政支持。
The First One-Pot Synthesis of Morita-Baylis-Hillman Adducts Starting Directly from Alcohols
作者:Lal Yadav、Vishnu Srivastava、Rajesh Patel
DOI:10.1055/s-0029-1219577
日期:2010.4
The first example of one-pot oxidative carbon-carbon bond formation via the Morita-Baylis-Hillman reaction using alcohols is reported. The protocol involves silica gel-DABCO catalyzed oxidation of alcohols to aldehydes with chloramine-T followed by their Morita-Baylis-Hillman reaction with acrylonitrile or methyl acrylate to give 70-87% overall yields of the corresponding Morita-Baylis-Hillman adducts
The Baylis-Hillman Adducts as Valuable Source for One-Pot Multi-Step Synthesis: A Facile Synthesis of Substituted Piperidin-2-ones
作者:Deevi Basavaiah、Raju Jannapu Reddy、Dandamudi V. Lenin
DOI:10.1002/hlca.200900352
日期:——
A facile, convenient, and one‐pot multi‐step synthesis of substituted piperidin‐2‐ones from the Baylis–Hillman alcohols derived from various aldehydes and acrylonitrile, involving Johnson–Claisen rearrangement, reduction of an α,β‐unsaturated nitrile moiety into the saturated amine‐skeleton, followed by cyclization, in an operationally simple procedure, is described.
Rhodium‐Catalyzed Asymmetric Synthesis of 1,2‐Disubstituted Allylic Fluorides
作者:Fuad O. Usman、Achyut R. Gogoi、Jason C. Mixdorf、Osvaldo Gutierrez、Hien M. Nguyen
DOI:10.1002/anie.202314843
日期:2023.11.27
Access to enantioenriched 1,2-disubstituted allylic fluorides in good to high levels of enantiomeric excess was achieved using a chiral diene-ligated rhodium catalyst. Experimental results together with DFT calculations support a dynamic kinetic asymmetric transformation process, whose efficiency is impacted by developing steric interactions in the syn and anti π-allyl intermediate complexes.
使用手性二烯连接的铑催化剂,可以获得对映体过量的对映体富集 1,2-二取代烯丙基氟化物。实验结果以及 DFT 计算支持动态动力学不对称转变过程,其效率受 syn 和抗 π-烯丙基中间体复合物中产生的空间相互作用的影响。