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2017 ; 473
(2200
): 20160859
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Some aspects of radical cascade and relay reactions
#MMPMID28484329
Quiclet-Sire B
; Zard SZ
Proc Math Phys Eng Sci
2017[Apr]; 473
(2200
): 20160859
PMID28484329
show ga
The ability to create carbon-carbon bonds is at the heart of organic synthesis.
Radical processes are particularly apt at creating such bonds, especially in
cascade or relay sequences where more than one bond is formed, allowing for a
rapid assembly of complex structures. In the present brief overview, examples
taken from the authors' laboratory will serve to illustrate the strategic impact
of radical-based approaches on synthetic planning. Transformations involving
nitrogen-centred radicals, electron transfer from metallic nickel and the
reversible degenerative exchange of xanthates will be presented and discussed.
The last method has proved to be a particularly powerful tool for the
intermolecular creation of carbon-carbon bonds by radical additions even to
unactivated alkenes. Various functional groups can be brought into the same
molecule in a convergent manner and made to react together in order to further
increase the structural complexity. One important benefit of this chemistry is
the so-called RAFT/MADIX technology for the manufacture of block copolymers of
almost any desired architecture.