Electro‐Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO 3
نویسندگان
چکیده
منابع مشابه
[Synthesis of alkaloids using radical cyclizations].
This review deals with the synthesis of alkaloids using radical cyclizations. Emphasis has been placed on radical cascades that provide synthesis of (-)-cephalotaxine, (±)-stemonamide, and (±)-isostemonamide.
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(E)-3-Ylideneoxindoles are prepared in methanol in reasonable to good yields, as adducts of photochemical 5-exo-trig of aryl radicals, in contrast to previously reported analogous radical cyclizations initiated by tris(trimethylsilyl)silane and azo-initiators that gave reduced oxindole adducts.
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This Perspective presents recent advances in macromolecular engineering enabled by ATRP. They include the fundamental mechanistic and synthetic features of ATRP with emphasis on various catalytic/initiation systems that use parts-per-million concentrations of Cu catalysts and can be run in environmentally friendly media, e.g., water. The roles of the major components of ATRP--monomers, initiato...
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............................................................................................................................. iii Acknowledgments............................................................................................................... v Table of
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Overcoming the challenge of metal contamination in traditional ATRP systems, a metal-free ATRP process, mediated by light and catalyzed by an organic-based photoredox catalyst, is reported. Polymerization of vinyl monomers are efficiently activated and deactivated with light leading to excellent control over the molecular weight, polydispersity, and chain ends of the resulting polymers. Signifi...
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ژورنال
عنوان ژورنال: Angewandte Chemie
سال: 2020
ISSN: 0044-8249,1521-3757
DOI: 10.1002/ange.202003565