Platinum-Catalyzed Formal Markownikoff’s Hydroamination/Hydroarylation Cascade of Terminal Alkynes Assisted by Tethered Hydroxyl Groups
摘要:
An efficient method for Markownikoff's hydroamination-hydroarylation of alkynols using PtBr2 as catalyst has been developed. The platinum-catalyzed reactions of alkynols with amino group containing aromatics were achieved in methanol over a reaction time of 6-24 h and temperature ranging from rt to 80 degrees C. This method works well for a variety of alkynols and aromatic amino compounds to give substituted pyrrolo[1,2-a]quinoxalines and indolo[3,2-c]quinolines in good to excellent yields.
Pt(IV)-Catalyzed Hydroamination Triggered Cyclization: A Strategy to Fused Pyrrolo[1,2-<i>a</i>]quinoxalines, Indolo[1,2-<i>a</i>]quinoxalines, and Indolo[3,2-<i>c</i>]quinolines
作者:Nitin T. Patil、Rahul D. Kavthe、Valmik S. Shinde、Balasubramanian Sridhar
DOI:10.1021/jo100373w
日期:2010.5.21
A PtCl4-catalyzed hydroamination-triggered cyclization strategy to access biologically interesting N-containing heterocycles such as pyrrolo[1,2-a]quinoxalines, indolo[1,2-a]quinoxalines, and indolo[3,2-c]quinolines is described. The reaction makes use of aminoaromatics such as 1-(2-aminophenyl)pyrroles, N-(2-aminophenyl)indoles, 2-(2-aminophenyl)indoles, and alkynes having a tethered hydroxyl group
一种PtCl 4催化的加氢胺触发的环化策略,以获取生物学上有趣的含N杂环,如吡咯并[1,2- a ]喹喔啉,吲哚[1,2- a ]喹喔啉和吲哚[3,2- c ]喹啉描述。该反应利用氨基芳族化合物,例如1-(2-氨基苯基)吲哚,N-(2-氨基苯基)吲哚,2-(2-氨基苯基)吲哚和具有束缚羟基的炔烃。从机理上讲,该反应非常吸引人,因为它涉及由单一金属催化剂PtCl 4催化的多个催化循环。当反应在微波辅助条件下进行时,我们观察到了速率的显着提高。
Platinum-Catalyzed Formal Markownikoff’s Hydroamination/Hydroarylation Cascade of Terminal Alkynes Assisted by Tethered Hydroxyl Groups
作者:Nitin T. Patil、Rahul D. Kavthe、Vivek S. Raut、Vaddu V. N. Reddy
DOI:10.1021/jo901200j
日期:2009.8.21
An efficient method for Markownikoff's hydroamination-hydroarylation of alkynols using PtBr2 as catalyst has been developed. The platinum-catalyzed reactions of alkynols with amino group containing aromatics were achieved in methanol over a reaction time of 6-24 h and temperature ranging from rt to 80 degrees C. This method works well for a variety of alkynols and aromatic amino compounds to give substituted pyrrolo[1,2-a]quinoxalines and indolo[3,2-c]quinolines in good to excellent yields.