Gold- and silver-catalyzed allylic alkylation of 1,3-dicarbonyl compounds with allylic alcohols
作者:Prasath Kothandaraman、Weidong Rao、Xiaoxiang Zhang、Philip Wai Hong Chan
DOI:10.1016/j.tet.2008.11.102
日期:2009.2
A highly efficient gold- and silver-catalyzed allylicalkylation of 1,3-dicarbonyl compounds with allylic alcohols has been developed. The reaction was shown to proceed expediently for a wide variety of 1,3-dicarbonyl compounds and allylic alcohols, including 1° and terminal ones, under very mild conditions at room temperature in good to excellent yields (55–96%).
Hydrogenations constitute fundamental processes in organic chemistry and allow for atom-efficient and clean functional group transformations. In fact, the selective reduction of nitriles, ketones, and aldehydes with molecular hydrogen permits access to a green synthesis of valuable amines and alcohols. Despite more than a century of developments in homogeneous and heterogeneous catalysis, efforts toward
A highly enantioselective nickel-catalyzed intramolecular hydroalkenylation of N- or O-tethered 1,6-dienes was developed by using monodentate chiral spiro phosphoramidite ligands. The reaction provides an efficient and straightforward method for preparing very useful six-membered N- and O-heterocycles with high regioselectivity as well as excellent stereoselectivity from easily accessible starting
通过使用单齿手性螺亚磷酰胺配体开发了高度对映选择性镍催化的 N 或 O 系链 1,6-二烯的分子内加氢烯基化。该反应提供了一种有效且直接的方法,可以在温和的反应条件下从易于获得的起始材料中制备非常有用的六元 N-和 O-杂环,具有高区域选择性和优异的立体选择性。本研究中开发的手性螺镍催化剂是为数不多的用于非共轭二烯高度对映选择性环化的催化剂之一。
Gold-catalysed allylic alkylation of aromatic and heteroaromatic compounds with allylic alcohols
作者:Weidong Rao、Philip Wai Hong Chan
DOI:10.1039/b805067h
日期:——
Friedel-Crafts allylicalkylation of a wide variety of aromatic and heteroaromatic compounds with allylic alcohols catalysed by AuCl(3) (5 mol%) under mild conditions at room temperature was accomplished in good to excellent yields (up to 99%) and regioselectivity.
Combined Oxypalladation/CH Functionalization: Palladium(II)-Catalyzed Intramolecular Oxidative Oxyarylation of Hydroxyalkenes
作者:Rong Zhu、Stephen L. Buchwald
DOI:10.1002/anie.201108129
日期:2012.2.20
An efficient protocol has been developed for the intramolecularoxidativeoxyarylation using a PdII‐catalyzed tandem oxypalladation/CHfunctionalization strategy. This methodology allows rapid access to tetrahydro‐2H‐indeno‐[2,1‐b]furan frameworks from simple hydroxyalkenes. The reactivity of this process is orthogonal to that of Pd0‐catalyzed transformations, enabling the divergent modification of
使用 Pd II催化的串联氧钯化/C H 功能化策略开发了一种有效的分子内氧化氧基化方案。该方法允许从简单的羟基烯烃快速获得四氢-2H-茚并- [2,1- b ]呋喃骨架。该过程的反应性与 Pd 0催化转化的反应性正交,从而能够对单个分子进行不同的修饰。