建立了一种有效的望远镜方法,制备了含4 H -chromen-4-one片段的呋喃-2(5 H)-one衍生物。基于3-(二甲基氨基)-1-(2-羟基苯基)丙-2-烯-1-酮,芳基乙二醛和Meldrum酸的串联多组分反应的建议方法。拟议协议的一个显着特征是在一个合成阶段同时形成4 H -chromen-4-one和呋喃2(5 H)-one片段。该合成方法的优点是反应条件温和,原子经济且易于后处理,可避免色谱纯化。通过X射线衍射确定呋喃-2(5 H)-one衍生物之一的结构。
Practical hydroxymethylation of aldehydes and ketones via pinacol cross-coupling reactions with paraformaldehyde
作者:Jeonghan Park、Steven F. Pedersen
DOI:10.1016/s0040-4020(01)88875-x
日期:——
method for the direct hydroxymethylation of aldehydes and ketones via pinacol cross-coupling with paraformaldehyde is described. The reaction is promoted by vanadium(II) ions which are conveniently generated from the reduction of VCl3(THF)3 with zinc dust. Excellent yields of terminal diols are obtained and stereoselective coupling is observed with some chiral aldehydes and ketones.
Synthesis of 2-hydroxy-2-phenylethylamino derivatives as potential α-adrenergic blocking agents
作者:M. Alvarez、R. Granados、R. Lavilla、M. Salas
DOI:10.1002/jhet.5570220326
日期:1985.5
synthesis of N,N'-bis[6-(2-hydroxy-2-phenylethylamino)hexyl] cystamines 4, and N-(2-hydroxy-2-phenylethyl)-1,6-hexanediamines 6 are described. Compounds 4 were obtained by condensation of the requisite epoxide 2 with 3-(6-aminohexyl)-1,3-thiazolidine followed by dimerization with opening of the thiazolidine ring. A similar method was used for the preparation of compounds 6. In order to prepare 4j (N,N'-bis6-[2-hydroxy-2(3