Ruthenium-Catalyzed Oxidative Cross-Coupling Reaction of Activated Olefins with Vinyl Boronates for the Synthesis of (<i>E</i>,<i>E</i>)-1,3-Dienes
作者:Dattatraya H. Dethe、Nagabhushana C. Beeralingappa、Amar Uike
DOI:10.1021/acs.joc.0c02823
日期:2021.2.19
An oxidativecross-coupling reaction between activated olefins and vinyl boronate derivatives has been developed for the highly stereoselective construction of synthetically useful (E,E)-1,3-dienes. The highlight of this reaction is that exclusive stereoselectivity (only E,E-isomer) was achieved from a base-free, ligand-free, and mild catalytic condition with a less expensive [RuCl2(p-cymene)]2 catalyst
Inexpensive Ruthenium NNS-Complexes as Efficient Ester Hydrogenation Catalysts with High C=O vs. C=C Selectivities
作者:Bernhard M. Stadler、Pim Puylaert、Justus Diekamp、Richard van Heck、Yuting Fan、Anke Spannenberg、Sandra Hinze、Johannes G. de Vries
DOI:10.1002/adsc.201701607
日期:2018.3.20
Ru(NNS)(PPh3)Cl2 (NNS=2‐(methylthio)‐N‐(pyridin‐2‐yl‐methyl)ethan‐1‐amine) was employed in the hydrogenation of α,β‐unsaturatedesters, reaching selectivities for the allylic alcohol up to 95% in the hydrogenation of iso‐butylcinnamate. In addition, several ester substrates were hydrogenated with catalyst loadings as low as 0.05 mol%. Surprisingly, selectivity of the hydrogenation of the C=O vs the
BITTER TASTE MODIFIERS INCLUDING SUBSTITUTED 1-BENZYL-3-(1-(ISOXAZOL-4-YLMETHYL)-1H-PYRAZOL-4-YL)IMIDAZOLIDINE-2,4-DIONES AND COMPOSITIONS THEREOF
申请人:SENOMYX, INC.
公开号:US20160376263A1
公开(公告)日:2016-12-29
The present invention includes compounds and compositions known to modify the perception of bitter taste, and combinations of said compositions and compounds with additional compositions, compounds, and products. Exemplary compositions comprise one or more of the following: cooling agents; inactive drug ingredients; active pharmaceutical ingredients; food additives or foodstuffs; flavorants, or flavor enhancers; food or beverage products; bitter compounds; sweeteners; bitterants; sour flavorants; salty flavorants; umami flavorants; plant or animal products; compounds known to be used in pet care products; compounds known to be used in personal care products; compounds known to be used in home products; pharmaceutical preparations; topical preparations; cannabis-derived or cannabis-related products; compounds known to be used in oral care products; beverages; scents, perfumes, or odorants; compounds known to be used in consumer products; silicone compounds; abrasives; surfactants; warming agents; smoking articles; fats, oils, or emulsions; and/or probiotic bacteria or supplements.
Palladium(II)-catalyzed catalytic aminocarbonylation and alkoxycarbonylation of terminal alkynes: regioselectivity controlled by the nucleophiles
作者:Rami Suleiman、Jimoh Tijani、Bassam El Ali
DOI:10.1002/aoc.1585
日期:——
the selectivity towards the gem or trans unsaturated esters or amides with these nucleophiles. The effects of the type of palladium catalysts, the type of ligands, the amount of dppb and the solvents were carefully studied. With diisobutylamine (2b1), excellent regioselectivity towards the 2‐acrylamides (gem isomer, 3ab1) was almost always observed, while trans‐α,β‐unsaturated esters 4ac1 was the predominant
Kinetics of trans-Cinnamic Anhydride Reactions Catalyzed by Pyridine, 4-Dimethylaminopyridine, and N-Methylimidazole
作者:Shu-Fen Lin、Kenneth A. Connorsx
DOI:10.1002/jps.2600700302
日期:1981.3
pyridine, 4-dimethylaminopyridine, and N-methylimidazole as catalysts. The absolute rates of the catalyzed hydrolysis decreased with increasing acetonitrile content (decreasing solvent polarity), but the catalytic efficiency of N-methylimidazole and 4-dimethylaminopyridine relative to pyridine increased as the solvent polarity decreased. The relative catalytic rates for the cinnamoylation of n-propanol