Efficient preparations of acylamides, acylcarbamates and acylureas from alk-1-en-2-yl esters
摘要:
Acylamides, acylcarbamates and acylureas have been synthesized by acylation of amides, carbamates and ureas sodium salts with alk-1-en-2-yl esters prepared with [Ru(mu-O2CH)(CO)(2)(PPh(3))](2) as catalyst.
Ruthenium(IV)-Catalyzed Markovnikov Addition of Carboxylic Acids to Terminal Alkynes in Aqueous Medium
作者:Victorio Cadierno、Javier Francos、José Gimeno
DOI:10.1021/om1010325
日期:2011.2.28
promote the selective Markovnikov addition of both aromatic and aliphatic carboxylic acids to a large variety of terminal alkynes, enynes, and diynes as well as propargylicalcohols. In this way, a wide number of enol esters and β-oxoesters could be synthesized in moderate to good yields under mild conditions (60 °C) in an aqueous medium.
A rapid and efficient method is described for the selective synthesis of enol esters via the microwave-accelerated addition of carboxylic acids to terminal alkynes. The method employs the readily available [RuCl2(p-cymene)(PPh3)] complex as catalyst without the need of bases, and reactions are complete in 20 min.
Catalytic activity assessment of [RuCl2 (p-cymene) (PTA)] in the synthesis of enol esters
作者:Eric Musengimana、Claver Fatakanwa
DOI:10.1007/s13738-015-0732-7
日期:2016.2
The addition of carboxylic acids onto 1-hexyne was catalyzed by [RuCl2 (p-cymene) (PTA)] complex to give enol esters. Accordingly, the Markovnikov addition-type product was selectively obtained. The microwave-assisted reactions at 160 °C confirmed the influence of the temperature, where quantitative to excellent yields were obtained in 30 min. The catalyst loading test proved that [RuCl2 (p-cymene) (PTA)] complex can be efficiently used with a 1/1500 ratio to carboxylic acid providing the TON value of 1500.