Lewis Acid Catalyzed SN2-Type Ring Opening of N-Activated Aziridines with Electron-Rich Arenes/Heteroarenes
摘要:
An efficient Lewis acid catalyzed S(N)2-type ring opening of substituted aziridines with electron-rich arenes/heteroarenes to provide substituted 2,2-diaryl/heteroarylethylamines in excellent yields and stereoselectivity (er, dr >99:1) is described.
A Highly Effective Cobalt Catalyst for Olefin Aziridination with Azides: Hydrogen Bonding Guided Catalyst Design
摘要:
[Co(P1)], which was designed on the basis of potential hydrogen-bonding interactions in the metal-nitrene intermediate, is a highly active aziridination catalyst with azides. [Co(P1)] can effectively aziridinate various aromatic olefins with arylsulfonyl azides under mild conditions, forming sulfonylated aziridines in excellent yields. The Co-based system enjoys several attributes associated with the relatively low cost of cobalt and the wide accessibility of arylsulfonyl azides. Furthermore, it generates stable dinitrogen as the only byproduct.
achieved with a two-step protocol comprising an allylic cation mediated nucleophilic addition and an intramolecular cyclization reaction. The N-aryl sulfonyl protecting groups of cyclization products were readily removed to furnish free amines with retention of halogensubstitutions and CC double bonds.
Imido Transfer from Bis(imido)ruthenium(VI) Porphyrins to Hydrocarbons: Effect of Imido Substituents, C−H Bond Dissociation Energies, and Ru<sup>VI/V</sup> Reduction Potentials
(BDE) of the hydrocarbons. A linear correlation was observed between log k' (k' is the k2 value divided by the number of reactive hydrogens) and BDE and between log k2 and E(1/2)(Ru(VI/V)); the linearity in the former case supports a H-atom abstraction mechanism. The amidation by [Ru(VI)(TMP)(NNs)2] reverses the thermodynamic reactivity order cumene > ethylbenzene/toluene, with k'(tertiary C-H)/k'(secondary
Nitrene Transfer Reactions Catalyzed by Gold Complexes
作者:Zigang Li、Xiangyu Ding、Chuan He
DOI:10.1021/jo060016t
日期:2006.8.1
We report here the first gold-catalyzed nitrenetransferreaction. A gold(I) compound, supported by 4,4‘,4‘ ‘-tri-tert-butyl-2,2‘:6‘,2‘ ‘-terpyridine (tBu3tpy) as the ligand, efficiently catalyzes olefin aziridination with the use of the commercially available oxidant PhI(OAc)2 and sulfonamides. This system also mediates carbene insertion into benzene.
我们在这里报告了第一个金催化的腈转移反应。由4,4',4''-三叔丁基-2,2':6',2'-叔吡啶(t Bu 3 tpy)担载的金(I)化合物有效催化烯烃使用可商购的氧化剂PhI(OAc)2和磺酰胺进行叠氮化。该系统还介导卡宾插入苯中。
A New Approach to Non-Coordinating Anions: Lewis Acid Enhancement of Porphyrin Metal Centers in a Zwitterionic Metal–Organic Framework
作者:Jacob A. Johnson、Brenna M. Petersen、Attila Kormos、Elena Echeverría、Yu-Sheng Chen、Jian Zhang
DOI:10.1021/jacs.6b05626
日期:2016.8.17
cationic metal center. We demonstrate the enhanced Lewis acidity of Mn(III)- and Fe(III)-porphyrins in the zwitterionic MOFs in three representative electrocyclization reactions: [2 + 1] cycloisomerization of enynes, [3 + 2] cycloaddition of aziridines and alkenes, and [4 + 2] hetero-Diels-Alder cycloaddition of aldehydes with dienes. This work paves a new way to design functional MOFs for tunable chemical
[EN] 6-SUBSTITUTED PHENOXYCHROMAN CARBOXYLIC ACID DERIVATIVES<br/>[FR] DÉRIVÉS DE L'ACIDE CARBOXYLIQUE PHÉNOXYCHROMANE SUBSTITUÉS EN 6
申请人:ARRAY BIOPHARMA INC
公开号:WO2009158426A1
公开(公告)日:2009-12-30
Compounds of Formula (I): in which A1, A2, W, L, G, R7a, R7b, R8, R9 and R10 have the meanings given in the specification, are DP2 receptor modulators useful in the treatment of immunologic diseases.