Microwave irradiation of a mixture of aromatic aldehydes and hexamethyldisilazane in the presence of a solid catalyst such as alumina afforded methanediamines which were efficiently converted to either cis- or trans-2,4,5-triarylimidazolines depending on the base used. A one-pot selective synthesis of cis- and transimidazolines from aromatic aldehydes was achieved under microwave irradiation.
A mild and highly efficient protocol for the one-pot synthesis of primary α-amino phosphonates under solvent-free conditions
作者:Najmedin Azizi、Fatemeh Rajabi、Mohammad R. Saidi
DOI:10.1016/j.tetlet.2004.10.092
日期:2004.12
Undersolvent-free reaction conditions and in the presence of solid LiClO4 a novel and mild protocol for the one-pot, three-component synthesis of primary α-aminophosphonates from an aldehyde, hexamethyldisilazane and a trialkyl phosphite is described giving high yields and having short reaction times. The same products are obtained in very low yields, when the three-component reaction is carried
Synthesis of N,N-di(arylmethylidene)arylmethanediamines by flash vacuum pyrolysis of arylmethylazides
作者:Chin-Hsing Chou、Li-Tse Chu、Shao-Jung Chiu、Chin-Fan Lee、Yao-Teng She
DOI:10.1016/j.tet.2004.06.082
日期:2004.7
Flashvacuumpyrolysis of arylmethylazides 7a-d gave 2,4-diazapentadienes 5a-d in high yield (76–92%). The thermal cyclization of 5a-d gave cis-imidazolines 1a-d, further heating or Swern oxidation of 1a-d gave dehydrogenated products, imidazoles 2a-d.