1197-05-3Relevant academic research and scientific papers
Preparation method of high-temperature-resistant composite cross-linking agent
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Paragraph 0044; 0055; 0061; 0072; 0078; 0089; 0095; 0106, (2021/06/22)
The invention belongs to the technical field of preparation of crosslinking agents, and particularly relates to a preparation method of a high-temperature-resistant composite crosslinking agent, which comprises 20 - 40 parts of a zirconium oxychloride sol
Selective Cross-Coupling of (Hetero)aryl Halides with Ammonia to Produce Primary Arylamines using Pd-NHC Complexes
Lombardi, Christopher,Day, Jonathan,Chandrasoma, Nalin,Mitchell, David,Rodriguez, Michael J.,Farmer, Jennifer L.,Organ, Michael G.
supporting information, p. 251 - 254 (2017/04/26)
Herein we report the first example of (hetero)arylation of ammonia using a monoligated palladium-NHC complex. The new, rationally designed, precatalyst (DiMeIHeptCl)Pd(allyl)Cl featuring highly branched alkyl chains has been shown to be effective in selective aminations across a range of challenging substrates, including nitrogen-containing heterocycles and those featuring base-sensitive functionality. The less bulky Pd-PEPPSI-IPentCl precatalyst performs well for ortho-substituted aryl halides, giving monoarylated products in high yield with good selectivity.
Palladium-catalyzed coupling of ammonia with aryl chlorides, bromides, iodides, and sulfonates: A general method for the preparation of primary arylamines
Vo, Giang D.,Hartwig, John F.
supporting information; scheme or table, p. 11049 - 11061 (2009/12/05)
We report that the complex generated from Pd[P(o-tol)3] 2 and the alkylbisphosphine CyPF-t-Bu is a highly active and selective catalyst for the coupling of ammonia with aryl chlorides, bromides, iodides, and sulfonates. The couplings of ammonia with this catalyst conducted with a solution of ammonia in dioxane form primary arylamines from a variety of aryl electrophiles in high yields. Catalyst loadings as low as 0.1 mol % were sufficient for reactions of many aryl chlorides and bromides. In the presence of this catalyst, aryl sulfonates also coupled with ammonia for the first time in high yields. A comparison of reactions in the presence of this catalyst versus those in the presence of existing copper and palladium systems revealed a complementary, if not broader, substrate scope. The utility of this method to generate amides, imides, and carbamates is illustrated by a one-pot synthesis of a small library of these carbonyl compounds from aryl bromides and chlorides, ammonia, and acid chlorides or anhydrides. Mechanistic studies show that reactions conducted with the combination of Pd[P(o-tol)3]2 and CyPF-t-Bu as catalyst occur with faster rates and higher yields than those conducted with CyPF-t-Bu and palladiun(II) as catalyst precursors because of the low concentration of active catalyst that is generated from the combination of palladium(II), ammonia, and base.
PYRANONE COMPOUNDS USEFUL TO TREAT RETROVIRAL INFECTIONS
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, (2008/06/13)
The present invention relates to compounds of formulae (I) and (II) which are pyran-2-ones, 5,6-dihydro-pyran-2-ones, 4-hydroxy-benzopyran-2-ones, 4-hydroxy-cycloalkyl[b]pyran-2-ones, and derivatives thereof, useful for inhibiting a retrovirus in a mammalian cell infected with said retrovirus, wherein R 10 and R 20 taken together are formulae (III) and (IV). STR1
Non-peptidic HIV protease inhibitors: C2-symmetry-based design of bis- sulfonamide dihydropyrones
Janakiraman, Musiri N.,Watenpaugh, Keith D.,Tomich, Paul K.,Chong, Kong-Teck,Turner, Steve R.,Tommasi, Ruben A.,Thaisrivongs, Suvit,Strohbach, Joseph W.
, p. 1237 - 1242 (2007/10/03)
Potent, non-peptidic, dihydropyrone sulfonamide HIV protease inhibitors have been previously described. Crystallographic analysis of dihydropyrone sulfonamide inhibitor/HIV protease complexes suggested incorporation of a second, C2 symmetry-rel
Facile Hydrodehalogenation with H2 and Pd/C Catalyst under Multiphase Conditions. 2. Selectivity and Kinetics
Marques, Carlos Alberto,Selva, Maurizio,Tundo, Pietro
, p. 3830 - 3837 (2007/10/02)
Hydrodehalogenation of polyhalogenated aromatics with Pd/C catalyst carried out in the presence of a quaternary onium salt follows zero-order kinetics in the substrate and first-order kinetics in the Pd/C catalyst; the related rate constants were determined for o-, m- and p-bromotoluenes, o-, m- and p-chloroalkylbenzenes (methyl, ethyl, and propyl derivatives), and other aryl halides.Reaction rates, depending on the aromatic to be reduced, may be strongly enhanced by the presence of quaternary onium salts: the isomeric chloroethylbenzenes were reduced 50 times faster when operating in the presence of Aliquat 336 (1).Also the hindered 2-chloro-m-xylene easily yielded m-xylene.The cocatalyst onium salts operate by being adsorbed on the Pd/C surface, as shown when kinetic constants are reported by varying the onium salt amount: classical Langmuir adsorption isotherms are observed.The presence of the onium salt may also influence selectivity in the reduction of isomeric aryl halides: when 1 is present, p-dichlorobenzene reacts in diethyl ether at 20 deg C, 5-fold slower than the ortho isomer; whereas the reduction rates of the two compounds are almost the same in its absence.
3' Cyanophenylalkanolamines: a contribution to the search for selective β adrenomimetic compounds
Pratesi,Grana,Villa
, p. 753 - 765 (2007/10/06)
Some derivatives of 1 (3' cyanophenyl) 2 aminoethanol have been synthesized in which OH is substituted at the nucleus, methyl or ethyl at the α carbon atom and isopropyl or t butyl at the nitrogen atom. The pharmacological research has shown that by combi
