73286-70-1Relevant articles and documents
Merging Halogen-Atom Transfer (XAT) and Cobalt Catalysis to Override E2-Selectivity in the Elimination of Alkyl Halides: A Mild Route towardcontra-Thermodynamic Olefins
Zhao, Huaibo,McMillan, Alastair J.,Constantin, Timothée,Mykura, Rory C.,Juliá, Fabio,Leonori, Daniele
supporting information, p. 14806 - 14813 (2021/09/18)
We report here a mechanistically distinct tactic to carry E2-type eliminations on alkyl halides. This strategy exploits the interplay of α-aminoalkyl radical-mediated halogen-atom transfer (XAT) with desaturative cobalt catalysis. The methodology is high-yielding, tolerates many functionalities, and was used to access industrially relevant materials. In contrast to thermal E2 eliminations where unsymmetrical substrates give regioisomeric mixtures, this approach enables, by fine-tuning of the electronic and steric properties of the cobalt catalyst, to obtain high olefin positional selectivity. This unprecedented mechanistic feature has allowed access tocontra-thermodynamic olefins, elusive by E2 eliminations.
A Scalable Membrane Pervaporation Approach for Continuous Flow Olefin Metathesis
Breen, Christopher P.,Parrish, Christine,Shangguan, Ning,Majumdar, Sudip,Murnen, Hannah,Jamison, Timothy F.,Bio, Matthew M.
supporting information, p. 2298 - 2303 (2020/05/14)
The translation of olefin metathesis reactions from the laboratory to process scale has been challenging with traditional batch techniques. In this contribution, we describe a continuous membrane reactor design that selectively permeates the ethylene byproduct from metathetical processes, thereby overcoming the mass-transport limitations that have negatively influenced the efficiency of this transformation in batch vessels. The membrane sheet-in-frame pervaporation module yielded turnover numbers of >7500 in the case of diethyl diallylmalonate ring-closing metathesis. The preparation of more challenging, low-effective-molarity substrates, a cyclooctene and a 14-membered macrocyclic lactone, was also effective. A comparison of optimal membrane reactor conditions to a sealed tubular reactor revealed that the benefits of ethylene removal are most apparent at low reaction concentrations.
JAK inhibitor compound and application thereof
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Paragraph 0508; 0515; 0526-0527, (2020/09/12)
The invention relates to a JAK inhibitor compound and application thereof. Specifically, the invention discloses a compound shown as a formula (G), or an isotope labeled compound, or an optical isomer, a geometrical isomer, a tautomer or an isomer mixture of the compound, or a pharmaceutically acceptable salt of the compound, or a prodrug of the compound, or a metabolite of the compound. The invention also relates to the medical application of the compound.