Diverse One-Pot Electrophilic Trapping Reactions of 2-Quinolylzincates with Acyl Chlorides and Allyl Iodide
作者:Hye Jin Jeong、Suyeon Chae、Keunhong Jeong、Sung Keon Namgoong
DOI:10.1055/s-0039-1690036
日期:2020.2
tandem acylation reactions of 2-quinolylzincates under one-potreaction conditions facilitated the formation of biologically active (Z)-3-alkylidenephthalides and multifunctionalized quinoline derivatives at specific positions. The reactions of these zincates with allyl iodide produced three different types of temperature- and alkyl-ligand-dependent C-2 homologated quinolines. The reaction mechanisms for
Regioselective Synthesis of Natural and Unnatural (Z)-3-(1-Alkylidene)phthalides and 3-Substituted Isocoumarins Starting from Methyl 2-Hydroxybenzoates
benzene ring, have been selectively and efficiently synthesized by a new protocol which involves: (i) the conversion of methyl 2-hydroxybenzoates into the corresponding nonaflates; (ii) Pd-catalyzed alkynylation reactions of these derivatives; (iii) the conversion of the so obtained methyl 2-(1-alkynyl)benzoates into the corresponding carboxylic acids followed by a transition metal-catalyzed heteroannulation
Cycloisomerization of γ- and δ-acetylenic acids catalyzed by gold(I) chloride
作者:Estelle Marchal、Philippe Uriac、Béatrice Legouin、Loïc Toupet、Pierre van de Weghe
DOI:10.1016/j.tet.2007.07.066
日期:2007.10
We have developed a gold(I)-catalyzed intramolecular cyclization of γ- and δ-alkyne acids in mild conditions yielding various alkylidene lactones. Whereas a slight electronic effect of the R group was observed on the regioselectivity, bulky substituents on the R group bearing the alkyne strongly modify the reactivity. The cycloisomerization of o-alkynylbenzoic methyl esters was achieved rather with
The present invention is directed to a novel taste-masking composition comprising a taste-masking effective amount of an
Angelica
root extract, which shows unexpected effectiveness in reducing an undesirable taste in a food product (e.g., a beverage, broth, or whole grain food product), a dental product, an oral hygiene product or a medicinal product.