Surfactant-Type Brønsted Acid Catalyzed Dehydrative Nucleophilic Substitutions of Alcohols in Water
作者:Seiji Shirakawa、Shū Kobayashi
DOI:10.1021/ol062813j
日期:2007.1.1
A protocol for the dehydrative nucleophilicsubstitution of benzyl alcohols with a variety of carbon- and heteroatom-centered nucleophiles using dodecylbenzenesulfonic acid (DBSA) as a surfactant-type Bronsted acid catalyst in water has been developed. The reaction system can be applied to the stereoselective C-glycosylation of 1-hydroxy sugars in water. [reaction: see text].
the indole ring in the transition state. Furthermore, comparison of initial rates in H2O and in D2O reveals an observed kinetic solvent isotope effect (KSIE = 2.7). This simple protocol, which affords the desired products with CO2 and water as the coproducts, can be achieved under mild conditions without the need for base or other additives in water.
This article reports an efficient synthesis of triarylmethanes and tetraarylmethanes from chlorohydrocarbons with miscellaneous nucleophiles in fluorinated alcohols, featuring metal-free, wide substrate scope, excellent functional group tolerance, and mild reaction conditions.
Halogen bonding assisted site-selective C-3 triaryl methylation of indoles and <i>N</i>-triaryl methylation of imidazoles
作者:Dipika Konwar、Pranamika Sarma、Jagat Chandra Borah、Utpal Bora
DOI:10.1039/d3ob00783a
日期:——
existence of halogen bonding which is the driving force of the reaction. This approach is suitable for a wide range of substrates, furnishing moderate to excellent yields (up to 100%) of triaryl methylated products under ambient reaction conditions. Equimolar amounts of reactants are sufficient to obtain the optimum yield and in some cases pure products can be obtained without column chromatography.
Dual type of reactivity op 1,2-disubstituted dihydro-N-heteroaromatic systems. 11. Aromatization of N-sulfonyl-1,2-dihydroquinolines and isoquinolines containing an ?-indolyl or pyrrolyl substituent
作者:T. S. Chmilenko、T. N. Nezdiiminoga、L. M. Sidorenko、A. K. Sheinkman