Nickel-Catalyzed Diaryl Ketone Synthesis by N–C Cleavage: Direct Negishi Cross-Coupling of Primary Amides by Site-Selective <i>N</i>,<i>N</i>-Di-Boc Activation
作者:Shicheng Shi、Michal Szostak
DOI:10.1021/acs.orglett.6b02952
日期:2016.11.18
the first amidecross-coupling by direct metal insertion of simple and readily available primary amides. The overall strategy by N,N-di-Boc activation/metal insertion is suitable for a broad range of coupling protocols via acylmetals. Mechanistic experiments suggest high reactivity of N,N-di-Boc activated 1° amides in direct amide C–N cross-couplings.
Rh-Catalyzed Conjugate Addition of Arylzinc Chlorides to Thiochromones: A Highly Enantioselective Pathway for Accessing Chiral Thioflavanones
作者:Ling Meng、Ming Yu Jin、Jun Wang
DOI:10.1021/acs.orglett.6b02453
日期:2016.10.7
A highly efficient asymmetric synthesis of chiral thioflavanones is developed via conjugateaddition of arylzinc reagents to thiochromones using Rh(COD)Cl2/(R)-3,4,5-MeO-MeOBIPHEP catalyst. This method overcomes catalyst poisoning and substrate inertness and affords a series of chiral thioflavanones (2-arylthiochroman-4-ones) in good yields (up to 91% yield) with excellent ee values (up to 97% ee)
Transition-Metal-Free Cross-Coupling of Aryl and Heteroaryl Thiols with Arylzinc Reagents
作者:Bo Yang、Zhong-Xia Wang
DOI:10.1021/acs.orglett.7b03145
日期:2017.11.17
Cross-coupling of (hetero)arylthiols with arylzinc reagents via C–S cleavage was performed under transition-metal-free conditions. The reaction displays a wide scope of substrates and high functional-group tolerance. Electron-rich and -deficient (hetero)arylthiols and arylzinc reagents can be employed in this transformation. Mg2+ and Li+ ions were demonstrated to facilitate the reaction.
Production methods of alpha, alpha, alpha-trifluoromethylphenyl-substituted benzoic acid and intermediate therefor
申请人:——
公开号:US20010020110A1
公开(公告)日:2001-09-06
The present invention relates to a production method of compound [V] useful as an intermediate for medicaments and agrochemicals. The method includes reacting compound [III] with hexamethylenetetramine under heating to give compound [IV], and oxidizing the obtained compound [IV] with a halous acid salt or a ruthenium compound. According to the present invention, moreover, an organometallic compound having a tolyl group and compound [I] are cross-coupled in the presence of a catalyst to give compound [II] useful as an intermediate for medicaments and agrochemicals. The compound [II] is halogenated to give compound [III].
1
wherein X is halogen atom.
Microwave-assisted Negishi and Kumada cross-coupling reactions of aryl chloridesElectronic supplementary information (ESI) available: Experimental procedures and spectral data. See http://www.rsc.org/suppdata/cc/b3/b313887a/
作者:Peter Walla、C. Oliver Kappe
DOI:10.1039/b313887a
日期:——
Rapid Pd or Ni-catalyzed microwave-accelerated Negishi and Kumada cross-coupling reactions of aryl chlorides in solution and on solid phase are reported.