New indium-mediated cyclisation reactions of tethered haloenynes in aqueous solvent systems
作者:Andres Goeta、Matthew M. Salter、Hummad Shah
DOI:10.1016/j.tet.2006.01.094
日期:2006.4
The intramolecular cyclisation of tethered allyl bromides onto terminal alkynes mediated by metallic indium proceeds smoothly and cleanly in mixtures of THF and H2O to give unsaturated carbocycles and heterocycles in good yield. Alternatively, the cyclisation may be carried out in anhydrous THF with the aid of acid catalysis. The reaction is also mediated by a range of indium salts and proceeds with
由金属铟介导的链状烯丙基溴在末端炔烃上的分子内环化反应在THF和H 2 O的混合物中平稳且清洁地进行,从而以高收率得到不饱和碳环和杂环。或者,环化反应可在无水THF中借助酸催化进行。该反应还由一系列铟盐介导,并在共还原剂存在下以亚化学计量的铟进行。氘化的研究表明,通过协同反应的进行顺碳-碳三键的carboindination得到中间体,其在原位质子化。