A visible-light RuII photoredox Meerwein synthesis of isochromanones and isochromenones is described starting from diazonium salts of differently substituted anthranilic acids and various alkenes. This approach has allowed the reliable and efficient preparation of structures found in many biologically active molecules or used in materials chemistry.
First TDAE Reactivity Using Benzonitrile Derivatives as Substrates and Its Application to the Synthesis of 3-Substituted Isochroman-1-ones
作者:Omar Khoumeri、Thierry Terme、Patrice Vanelle
DOI:10.1055/s-0036-1591570
日期:2018.7
TDAE-initiated reaction between benzonitrile derivatives as substrates and substituted benzaldehydes to form substituted hydroxyethylbenzonitrile derivatives is reported. The 2-hydroxyethyl benzonitrile derivatives thus formed were good candidates for one-pot lactonization in a mixture of hydrochloricacid and methanol at 70 °C over five hours. These reactions furnished the corresponding 3-substituted isochroman-1-one
Metal‐ and Oxidant‐Free Electrosynthesis of Heterocycles from 1,2‐Diarylalkene Derivatives
作者:Eunsoo Yu、Hyungguk Kim、Cheol‐Min Park
DOI:10.1002/adsc.202200847
日期:2022.12.8
Synthesis of heterocycles from 1,2-diarylalkene derivatives through electrosynthesis under metal- and oxidant-free conditions has been discovered. Cathodic reduction of 2-alkenylbenzoic acid or anodic oxidation of 2-alkenylbenzamide, 2-alkenylphenol and 2-alkenylaniline leads to the formation of reactive radical intermediates which afford corresponding phthalide, isochroman-1-one, isoindolin-1-one
challenging intramolecular hydroacyloxylation reaction. Both HFIP and an internal carboxy group have been proven to be crucial for the successful implementation of this transformation; these are proposed to assist the formation and stabilization of the key cationic intermediate via hydrogen-bondinginteractions with perrhenate anion (ReO4–).
该出版物描述了 Re 2 O 7在六氟异丙醇 (HFIP) 中的应用,用于活化惰性和电子失活的烯烃,以促进具有挑战性的分子内加氢酰氧基化反应。HFIP 和内部羧基均已被证明对于成功实施这一转变至关重要;这些被提议通过与高铼酸盐阴离子 (ReO 4 – )的氢键相互作用来帮助关键阳离子中间体的形成和稳定。
Expeditious synthesis of 3,4-dihydroisocoumarins and phthalides using the Heck–Matsuda reaction
作者:Eduardo T. da Penha、José Augusto Forni、André F.P. Biajoli、Carlos Roque D. Correia
DOI:10.1016/j.tetlet.2011.09.014
日期:2011.11
Several 3,4-dihydroisocoumarins and phthalides were synthesized by an effective Heck-Matsuda reaction involving an ortho carboxybenzenediazonium salt with a series of styrenes bearing electron donating and electron withdrawing groups, methylvinyl ketone, and methyl acrylate. The reaction was carried out in an open-flask with 1% mol of palladium acetate in aqueous ethanol at similar to 80 degrees C, giving the correspondent 3-aryl-3,4-dihydroisocoumarins and phthalides with good overall yields. The electronic nature of the group attached to the olefin is a key feature for the regioselectivity of the cyclization step. (C) 2011 Elsevier Ltd. All rights reserved.