Copper(<scp>ii</scp>) acetate catalysed ring-opening cross-coupling of cyclopropanols with sulfonyl azides
作者:Mei-Hua Shen、Xiao-Long Lu、Hua-Dong Xu
DOI:10.1039/c5ra20729k
日期:——
A copper(II) acetate catalyzed ring-opening cross-coupling of cyclopropanol with sulfonyl azide has been developed. By this method, various β-amino ketones have been made efficiently in medium to high yields and venerable functional groups such as benzylic C–H, alkyl and aryl bromides, alkyl sulfonate, silyl ether and alkene are compatible with these reaction conditions. Control experiments have precluded
[RuIV(F20-TPP)Cl2] efficiently catalysed inter- and intra-molecular nitrene insertion into sp3 C–H bonds of hydrocarbons using phosphoryl azides as nitrene sources
作者:Wenbo Xiao、Jinhu Wei、Cong-Ying Zhou、Chi-Ming Che
DOI:10.1039/c3cc41110a
日期:——
[Ru(IV)(F20-TPP)Cl2][H2(F20-TPP) = meso-tetrakis(pentafluorophenyl)porphyrin] is an active catalyst for both inter- and intra-molecular nitreneinsertion into sp(3) C-H bonds of hydrocarbons in good to high product yields using phosphoryl azides as nitrene sources.
Stereoselective Construction of Bridged <i>trans</i>-aza-Bicyclo[7/6,3/2,1]alkenyl Imines through Ring Expansion aza-Cope Rearrangement
作者:Mei-Hua Shen、Ke Xu、Chu-Han Sun、Hua-Dong Xu
DOI:10.1021/acs.orglett.5b02798
日期:2015.11.20
stereoselective method for efficient synthesis of unprecedented bridged bicyclo[7/6,3/2,1]alkenyl amidines is described using cyclic N-allyl-aminoalkyne as a substrate. A ketenimine formation/cyclization/aza-Coperearrangement cascade proceeds either with or without the aid of external DIPEA depending on substrate basicity. Fused bicycloamidines are also obtained via the same protocol using different N-allyl cyclic
COMPOSITIONS AND METHODS FOR CATALYSTS BASED ON BRIDGED CHIRAL AMIDOPORPHYRINS AND THEIR METAL COMPLEXES
申请人:Trustees of Boston College
公开号:US20200330968A1
公开(公告)日:2020-10-22
In one aspect, the disclosure relates to a mode of asymmetric induction in radical processes based on enhanced hydrogen-bonding capability and the situation of metal centers in cavity-like chiral environments. Also disclosed is an asymmetric system for stereoselective synthesis of cyclopropane and aziridine derivatives. The disclosed Co(II)-based metalloradical system has been shown to have an unusual capability of controlling both the degree and sense of asymmetric induction in cyclopropanation and aziridination reactions in a systematic manner. The disclosed system is applicable to a broad scope of substrates having diazo or azido moieties and exhibits a remarkable profile of reactivity and selectivity, providing access to cyclopropane diastereomers and aziridine enantiomers in highly enantioenriched forms. Also disclosed are catalysts useful in the disclosed 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.
Iron-Catalyzed Amination of Sulfides and Sulfoxides with Azides in Photochemical Continuous Flow Synthesis
作者:Hélène Lebel、Henri Piras、Marie Borduy
DOI:10.1021/acscatal.5b02495
日期:2016.2.5
A photochemical (UVA) continuous flow process for the amination of thioethers and sulfoxides was performed with trichloroethoxysulfonyl azide in the presence of catalytic iron(III) acetylacetonate. Aromatic and aliphatic sulfilimines and sulfoximines were produced in high yields and short reaction times. The reaction with chiral sulfoxides was stereospecific, producing enantioenriched sulfoximines