<i>t</i>BuLi-Mediated One-Pot Direct Highly Selective Cross-Coupling of Two Distinct Aryl Bromides
作者:Carlos Vila、Sara Cembellín、Valentín Hornillos、Massimo Giannerini、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1002/chem.201502709
日期:2015.10.26
A Pd‐catalyzed direct cross‐coupling of twodistinctarylbromides mediated by tBuLi is described. The use of [Pd‐PEPPSI‐IPr] or [Pd‐PEPPSI‐IPent] as catalyst allows for the efficient one‐pot synthesis of unsymmetrical biaryls at room temperature. The key for this selective cross‐coupling is the use of an ortho‐substituted bromide that undergoes lithium–halogen exchange preferentially.
C(sp<sup>2</sup>)–H Borylation of Fluorinated Arenes Using an Air-Stable Cobalt Precatalyst: Electronically Enhanced Site Selectivity Enables Synthetic Opportunities
作者:Jennifer V. Obligacion、Máté J. Bezdek、Paul J. Chirik
DOI:10.1021/jacs.6b13346
日期:2017.2.22
Cobalt catalysts with electronically enhanced site selectivity have been developed, as evidenced by the high ortho-to-fluorine selectivity observed in the C(sp2)-H borylation of fluorinated arenes. Both the air-sensitive cobalt(III) dihydride boryl 4-Me-(iPrPNP)Co(H)2BPin (1) and the air-stable cobalt(II) bis(pivalate) 4-Me-(iPrPNP)Co(O2CtBu)2 (2) compounds were effective and exhibited broad functional
Decarboxylative Cross-Coupling of Aryl Tosylates with Aromatic Carboxylate Salts
作者:Lukas J. Gooßen、Nuria Rodríguez、Paul P. Lange、Christophe Linder
DOI:10.1002/anie.200905953
日期:2010.2.1
A bimetallic copper/palladium catalyst system is disclosed that enables the use of tosylates as carbon electrophiles in decarboxylative coupling reactions. A variety of aromaticcarboxylatesalts, regardless of their substitution pattern, have been coupled with these inexpensive and readily available electrophiles to give the corresponding biaryl compounds in good yields (see scheme).
Tetraethylphosphorodiamidate-Directed Metalation Group: Directed <i>Ortho</i> and Remote Metalation, Cross Coupling, and Remote Phospha Anionic Fries Rearrangement Reactions
作者:Jignesh J. Patel、Thomas Blackburn、Manlio Alessi、Hannah Sawinski、Victor Snieckus
DOI:10.1021/acs.orglett.0c01123
日期:2020.5.15
reactions of aryl phosphorodiamidates (Ar-OP(O)(NEt2)2) is reported. The o-iodo and o-boronato aryl tetraethylphosphorodiamidates 3, prepared by DoM, undergo orthogonal Ni- and Pd-catalyzed Suzuki-Miyaura cross coupling to furnish biaryls 4 and 5 in good to excellent yields. Silicon group protection of biaryl 4 via DoM followed by previously unobserved DreM phospha anionic Fries rearrangement affords biaryls
Rapid Nickel-Catalyzed Suzuki−Miyaura Cross-Couplings of Aryl Carbamates and Sulfamates Utilizing Microwave Heating
作者:Mostafa Baghbanzadeh、Christian Pilger、C. Oliver Kappe
DOI:10.1021/jo1024464
日期:2011.3.4
High-speed and scalable nickel-catalyzed cross-coupling of arylboronic acids with aryl carbamates and sulfamates is achieved by using sealed-vessel microwave processing.