通过可见光光氧化还原催化的催化脱氢(CD)为芳香族化合物的合成提供了一条有效的途径。然而,由于在光催化条件下难以控制胺的反应性,通过可见光诱导的环糊精来获得广泛使用的合成部分的N-芳基胺仍然是一个重大挑战。在这里,可见光诱导光催化合成N-芳基胺是通过烯丙胺的CD实现的。使用C 6 F 5 I作为氢原子受体的不寻常策略使得带有各种官能团和活化C-H键的胺能够温和且受控的CD,从而抑制反应性N-芳基胺产物的副反应。彻底的机理研究表明,单电子和氢原子转移以明确的顺序参与,以在控制反应性方面提供协同效应。值得注意的是,反电子转移过程可防止所需产物在氧化条件下进一步反应。
[EN] SYNTHESIS OF ACYCLIC AND CYCLIC AMINES USING IRON-CATALYZED NITRENE GROUP TRANSFER<br/>[FR] SYNTHÈSE D'AMINES ACYCLIQUES ET CYCLIQUES AU MOYEN D'UN TRANSFERT DE GROUPE NITRÈNE CATALYSÉ PAR LE FER
申请人:HARVARD COLLEGE
公开号:WO2014134141A1
公开(公告)日:2014-09-04
The present invention provides novel synthetic methods for making acyclic secondary amines by reacting an azide with a compound bearing one or more C-H groups, catalyzed by a FeII-dipyrromethene complex. The acyclic secondary amines are thought to be formed through an intermolecular nitrene transfer. Also provided herein are methods of synthesizing protected (e.g., Boc- or Fmoc-protected) cyclic secondary amines (e.g., 5-, 6-, and 7- membered cyclic secondary amines) by reacting an azide that bears one or more C-H groups, catalyzed by a FeII-dipyrromethene complex. The protected cyclic secondary amines are thought to be formed through an intramolecular nitrene transfer and may be subsequently deprotected to yield cyclic secondary amines.
SYNTHESIS OF ACYCLIC AND CYCLIC AMINES USING IRON-CATALYZED NITRENE GROUP TRANSFER
申请人:PRESIDENT AND FELLOWS OF HARVARD COLLEGE
公开号:US20160002145A1
公开(公告)日:2016-01-07
The present invention provides novel synthetic methods for making acyclic secondary amines by reacting an azide with a compound bearing one or more C—H groups, catalyzed by a Fe
II
-dipyrromethene complex. The acyclic secondary amines are thought to be formed through an intermolecular nitrene transfer. Also provided herein are methods of synthesizing protected (e.g., Boc- or Fmoc-protected) cyclic secondary amines (e.g., 5-, 6-, and 7-membered cyclic secondary amines) by reacting an azide that bears one or more C—H groups, catalyzed by a Fe
II
-dipyrromethene complex. The protected cyclic secondary amines are thought to be formed through an intramolecular nitrene transfer and may be subsequently deprotected to yield cyclic secondary amines.
US9487472B2
申请人:——
公开号:US9487472B2
公开(公告)日:2016-11-08
US9724682B2
申请人:——
公开号:US9724682B2
公开(公告)日:2017-08-08
Iron-mediated intermolecular N-group transfer chemistry with olefinic substrates
作者:Elisabeth T. Hennessy、Richard Y. Liu、Diana A. Iovan、Ryan A. Duncan、Theodore A. Betley
DOI:10.1039/c3sc52533c
日期:——
The dipyrrinato iron catalyst reacts with organic azides to generate a reactive, high-spin imido radical intermediate, distinct from nitrenoid or imido species commonly observed with low-spin transitionmetal complexes. The unique electronic structure of the putative group-transfer intermediate dictates the chemoselectivity for intermolecular nitrene transfer. The mechanism of nitrene group transfer