Simple and expeditious pinacol coupling of non usual α,β-unsaturated carbonyl compounds in water
作者:Muriel Billamboz、Nicolas Sotto、Carole Chevrin-Villette、Christophe Len
DOI:10.1039/c5ra03870g
日期:——
Using zinc (0) in a 5% v AcOH aqueous solution allowed the efficient pinacolcoupling of aliphatic or aromatic unusual, α,β-unsaturated carbonylcompounds such as citral A in good to excellent yields (56–99%). It can also be successfully applied to acetophenone.
Chromium(VI) Based Oxidants; IV.<sup>1</sup>Zinc Chlorochromate Nonahydrate as an Efficient and Mild Oxidizing Agent
作者:H. Firouzabadi、A. Sharifi
DOI:10.1055/s-1992-26288
日期:——
Zinc chlorochromate nonahydrate [Zn(CICrO3)2·9 H2O] is an easily prepared and a cheap oxidizing agent for the oxidation of different types of hydroxy compounds, unsaturated hydrocarbons, and benzylic carbon hydrogen bonds at room temperature in dichloromethane.
The sesquiterpene–coumarinether samarcandone provided a suitable framework to replace the apocarotenoid A–C ring system of strigol (1), replicating, after linking to a butenolide moiety, the activity of the natural phytohormone on Nrf2 and also showing potent NF-kB inhibitory activity, overall modulating two critical pathways of inflammation and cancer.
Substituent Effects on EI-MS Fragmentation Patterns of 5-Allyloxy-1-aryl-tetrazoles and 4-Allyl-1-aryl-tetrazole-5-ones; Correlation with UV-Induced Fragmentation Channels
作者:Alina Secrieru、Rabah Oumeddour、Maria L. S. Cristiano
DOI:10.3390/molecules26113282
日期:——
present work, we unravel the fragmentation patterns of a chemically diverse range of 5-allyloxy-1-aryl-tetrazoles and 4-allyl-1-aryl-tetrazolole-5-ones when subjected to electron impact mass spectrometry (EI-MS) and investigate the correlation with the UV-induced fragmentation channels of the matrix-isolated tetrazole derivatives. Our results indicate that the fragmentation pathways of the selected tetrazoles
Thioethers, often found in pharmaceuticals and natural compounds, typically involve metal cross-coupling reactions, high temperatures, and the use of disagreeable thiols for their synthesis. Here we present a straightforward, thiol-free organocatalytic protocol that uses mild conditions to stitch together inexpensive alcohols and aryl chlorides, yielding a diverse array of aryl alkyl thioethers. Central