Tandem Sequence of Phenol Oxidation and Intramolecular Addition as a Method in Building Heterocycles
作者:Maxim O. Ratnikov、Linda E. Farkas、Michael P. Doyle
DOI:10.1021/jo302002j
日期:2012.11.16
A tandem phenol oxidation–Michael addition furnishing oxo- and -aza-heterocycles has been developed. Dirhodium caprolactamate [Rh2(cap)4] catalyzed oxidation by T-HYDRO of phenols with alcohols, ketones, amides, carboxylic acids, and N-Boc protected amines tethered to their 4-position afforded 4-(tert-butylperoxy)cyclohexa-2,5-dienones that undergo Brønsted acid catalyzed intramolecular Michael addition
已经开发出串联苯酚氧化-迈克尔加成法,提供氧代-和-氮杂-杂环。T-HYDRO催化己内酰胺二甲酸铑[Rh 2(cap)4 ]与醇,酮,酰胺,羧酸和N- Boc保护的胺的束缚在其4位上的苯酚氧化,得到4-(叔进行布朗斯台德酸催化的一丁基过氧)环己2,5-二烯酮催化一锅内分子内迈克尔加成反应,以中等至良好的收率生产羰基和氮杂杂环。所开发方法的范围包括二肽Boc-Tyr-Gly-OEt和Boc-Tyr-Phe-Me,并为理解酪氨酸残基的氧化应激可能产生的转化提供了途径。已经发现,使用TiCl 4选择性地裂解受阻内部过氧化物中O-O键的新方法是致力于构建cleroindicin F,使用发达的方法,从酪醇中仅需3步即可完成50%的合成产率。