Abstract The oxidation of primaryaromaticamines, p-methylaniline, p-ethylaniline and p-chloroaniline to the corresponding azo- and azoxy-compounds has been observed in ultrasound and/or microwaves systems. The individual irradiation of microwaves and its simultaneous irradiation with ultrasound obviously elevate the conversion of amines, as compared with the individual irradiation of ultrasound and
Efficient One-Pot Synthesis of 1,3-Disubstituted Pyridin-2(1<i>H</i>)-ones from α-Hydroxyketene<i>S</i>,<i>S</i>-Acetals under Vilsmeier Conditions
作者:Qun Liu、Jun Liu、Deqiang Liang、Mang Wang
DOI:10.1055/s-0028-1083198
日期:2008.11
A facile and efficient one-pot synthesis of 1,3-disubstituted pyridin-2( 1H)-ones is developed via a novel cascade reaction of readily available a-hydroxy-a-carbamoyl ketene S,S-acetals under Vilsmeier conditions (DMF/POCl 3 ), and a mechanism of this domino reaction is proposed.
Hexamethyldisilazane was reacted with formamides to generate N,N-disubstituent formimidamide, after which a reaction with sulfonamides was induced to form sulfonylformamidines. This protocol can be applied for arylformamidine formation in which anilines are used as substrates under optimized conditions. The advantages of this method are high efficiency, structural diversity in products with good yields