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Palladium‐Catalysed, Directed CH Coupling with Organometallics
Author(s) -
Giri Ramesh,
Thapa Surendra,
Kafle Arjun
Publication year - 2014
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201400105
Subject(s) - chemistry , palladium , reactivity (psychology) , catalysis , reagent , transition metal , heteroatom , combinatorial chemistry , coupling reaction , organometallic chemistry , functional group , stereochemistry , organic chemistry , ring (chemistry) , medicine , polymer , alternative medicine , pathology
Abstract Transition metal (TM)‐catalysed CH coupling using organometallic reagents is developing into a distinct transformation area for the construction of carbon‐carbon (CC) bonds. Among different TMs (Ru, Rh, Pd, Co, Fe), complexes of palladium(II) are emerging as the most effective and versatile catalysts and have already asserted a proven track‐record for the catalytic activation and coupling of unactivated sp 2 and sp 3 CH bonds with sp 2 and sp 3 organometallic reagents. A majority of these TM‐catalysed CH coupling reactions utilise a heteroatom contained in substrates as a directing group. In the last decade, both traditional as well as non‐traditional but synthetically useful functional groups have been extensively exploited as directing groups. Novel directing groups based on mechanistic understanding have also been designed to enhance the reactivity of Pd(II) catalysts towards CH bonds. In addition, the unprecedented application of exogenous ligands to Pd(II)‐catalysed CH coupling is also on the rise, and this approach has already demonstrated an extraordinary level of success not only in breaking unactivated CH bonds enantioselectively, but also in improving reactivity of catalysts towards these CH bonds.