DIAMINE SYNTHESIS VIA CATALYTIC C-H AMINATION OF AZIDES
申请人:Zhang X. Peter
公开号:US20120101271A1
公开(公告)日:2012-04-26
Selective intramolecular C—H amination via metalloradical activation of azides: synthesis of 1,3-diamines under neutral and nonoxidative conditions. One aspect of the present invention is the synthesis of 1,3-diamines by intramolecular C—H amination of sulfamoyl azides. More specifically, sulfamoyl azides may be selectively aminated via metalloradical activation of azides, preferably with Co(II) porphyrins. In a particularly preferred embodiment, the Co(II) porphyrin is a D
2h
-symmetric porphyrin.
CATALYTIC SYSTEMS FOR STEREOSELECTIVE SYNTHESIS OF CHIRAL AMINES BY ENANTIODIVERGENT RADICAL C-H AMINATION
申请人:Trustees of Boston College
公开号:US20200317627A1
公开(公告)日:2020-10-08
In one aspect, the disclosure relates to a mode of asymmetric induction in radical processes based on sequential combination of enantiodifferentiative H-atom abstraction and stereoretentive radical substitution. Also disclosed is an asymmetric system for stereoselective synthesis of strained 5-membered cyclic sulfamides via radical 1,5-C—H amination of sulfamoyl azides. The disclosed metalloradical system can control the degree and sense of asymmetric induction in the catalytic radical C—H amination in a systematic manner. The disclosed system is applicable to a broad scope of substrates with different types of C(sp
3
)-H bonds and exhibits reactivity and selectivity, providing access to both enantiomers of useful 5-membered cyclic sulfamides in a highly enantioenriched form. Also disclosed are catalysts useful in these processes. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.
Catalytic systems for stereoselective synthesis of chiral amines by enantiodivergent radical C—H amination
申请人:Trustees of Boston College
公开号:US11161827B2
公开(公告)日:2021-11-02
In one aspect, the disclosure relates to a mode of asymmetric induction in radical processes based on sequential combination of enantiodifferentiative H-atom abstraction and stereoretentive radical substitution. Also disclosed is an asymmetric system for stereoselective synthesis of strained 5-membered cyclic sulfamides via radical 1,5-C—H amination of sulfamoyl azides. The disclosed metalloradical system can control the degree and sense of asymmetric induction in the catalytic radical C—H amination in a systematic manner. The disclosed system is applicable to a broad scope of substrates with different types of C(sp3)—H bonds and exhibits reactivity and selectivity, providing access to both enantiomers of useful 5-membered cyclic sulfamides in a highly enantioenriched form. Also disclosed are catalysts useful in these processes. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.
Selective Intramolecular CH Amination through the Metalloradical Activation of Azides: Synthesis of 1,3-Diamines under Neutral and Nonoxidative Conditions
作者:Hongjian Lu、Huiling Jiang、Lukasz Wojtas、X. Peter Zhang
DOI:10.1002/anie.201005552
日期:2010.12.27
N2 is the only by‐product in a stereospecific and highly diastereoselective intramolecularCH amination of sulfamoyl azides with a cobalt(II)‐based metalloradical catalyst (see scheme). The catalytic system has an unusual capacity for the efficient amination of strong primary CH bonds, as well as secondary and tertiary CH bonds, and functional‐group tolerance is excellent owing to the neutral and