Remote carboxylation of halogenated aliphatic hydrocarbons with carbon dioxide
作者:Francisco Juliá-Hernández、Toni Moragas、Josep Cornella、Ruben Martin
DOI:10.1038/nature22316
日期:2017.5
along the hydrocarbon side-chain with excellent regio- and chemoselectivity, representing a remarkable reactivity relay when compared with classical cross-coupling reactions. Our results demonstrate that site-selectivity can be switched and controlled, enabling the functionalization of less-reactive positions in the presence of a priori more reactive ones. Furthermore, we show that raw materials obtained
Site‐Selective, Remote sp
<sup>3</sup>
C−H Carboxylation Enabled by the Merger of Photoredox and Nickel Catalysis
作者:Basudev Sahoo、Peter Bellotti、Francisco Juliá‐Hernández、Qing‐Yuan Meng、Stefano Crespi、Burkhard König、Ruben Martin
DOI:10.1002/chem.201902095
日期:2019.7.5
A photoinduced carboxylation of alkyl halides with CO2 at remote sp3 C−Hsitesenabled by the merger of photoredox and Ni catalysis is described. This protocol features a predictable reactivity and siteselectivity that can be modulated by the ligand backbone. Preliminary studies reinforce a rationale based on a dynamic displacement of the catalyst throughout the alkyl side chain.
The present invention relates to a method of reacting starting materials with an activating group, namely alkanes carrying a leaving group and/or olefins, with carbon dioxide under transition metal catalysis to give carboxyl group-containing products. It is a special feature of the method of the present invention that the carboxylation predominantly takes place at a preferred position of the molecule irrespective of the position of the activating group. The carboxylation position is either an aliphatic terminus of the molecule or it is a carbon atom adjacent to a carbon carrying an electron withdrawing group. The course of the reaction can be controlled by appropriately choosing the reaction conditions to yield the desired regioisomer.
Synthesis of 3,4-bridged indoles by photocyclisation reactions. Part 1. Photocyclisation of halogenoacetyl tryptophan derivatives
作者:Anthony L. Beck、Mark Mascal、Christopher J. Moody、Alexandra M. Z. Slawin、David J. Williams、William J. Coates
DOI:10.1039/p19920000797
日期:——
results in a poor yield of photocyclisation to the indole 4-position due to competing cyclisation to C-2, the photocyclisation of (dichloroacetyl)tryptophan derivatives gives, after addition of a nucleophile in work-up, 7-substituted pyrrolobenzazocines in good yield and with trans-stereospecificity. N-(Trichloroacetyl)tryptophan derivatives also undergo photocyclisation to give 3,4-bridged indoles
Preparation of bivalent agonists for targeting the mu opioid and cannabinoid receptors
作者:Szabolcs Dvorácskó、Attila Keresztes、Adriano Mollica、Azzurra Stefanucci、Giorgia Macedonio、Stefano Pieretti、Ferenc Zádor、Fruzsina R. Walter、Mária A. Deli、Gabriella Kékesi、László Bánki、Gábor Tuboly、Gyöngyi Horváth、Csaba Tömböly
DOI:10.1016/j.ejmech.2019.05.037
日期:2019.9
CB1 and CB2 cannabinoid receptor agonist JWH-018 was conjugated with the opiate analgesic oxycodone or with an enkephalin related tetrapeptide. The opioid and cannabinoid pharmacophores were coupled via spacers of different length and chemical structure. In vitro radioligand binding experiments confirmed that the resulting bivalent compounds bound both to the opioid and to the cannabinoid receptors with