Microwave-assisted one-pot synthesis of a, β-unsaturated amides under solvent-free conditions
作者:Shilei Jiang、Yuanyuan Xie、Xiaochun Yu
DOI:10.3184/030823409x393682
日期:2009.1
Undermicrowave-assistedsolvent-freeconditions a one-pot reaction of triphenylphosphine, an aldehyde and N, N-diethyl chloroacetamide in the presence of zinc dust affords α, β-unsaturated amides stereoselectively in good yield. In comparison with the conventional heating method, the reaction was finished within five minutes under microwave irradiation.
在微波辅助的无溶剂条件下,三苯基膦、醛和 N, N-二乙基氯乙酰胺在锌粉存在下的一锅反应以良好的收率立体选择性地提供了 α, β-不饱和酰胺。与传统的加热方法相比,在微波照射下,反应在五分钟内完成。
Indium-Mediated Microwave-Assisted One-Pot Synthesis of α,β-Unsaturated Amides
A stereoselective synthesis of α,βunsaturated-N,N-diethyl amides was achieved by a one-pot reaction of triphenylphosphine, an aromatic aldehyde, and N,N-diethyl chloroacetamide in the presence of indium under microwave-assisted and solvent-free condition.
Sequential Reactions Promoted by Manganese: Completely Stereoselective Synthesis of (<i>E</i>)-α,β-Unsaturated Amides, Ketones, Aldehydes, and Carboxylic Acids
作者:José M. Concellón、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1021/jo701417z
日期:2007.10.1
A complete E-selective synthesis of a,alpha,beta-unsaturated amides through a sequential reaction of a range of dichloroamides with a variety of aldehydes promoted by Rieke manganese (Mn*) is reported. A mechanism based on a sequential aldol-type reaction and a completely stereoselective beta-elimination is proposed to explain these results. The unsaturated amides obtained are readily and efficiently transformed into alpha,beta-unsaturated ketones, aldehydes, or carboxylic acids without loss of the diastereoisomeric purity of the C-C double bond.