Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 49, Pages 15683-15687Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201704513
Keywords
cross-coupling; halides; palladium; photochemistry; radicals
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Funding
- National Natural Science Foundation of China [21772129]
- 973 Project from the MOST of China [2015CB856600]
- 1000-Youth Talents Plan
- Fundamental Research Funds for the Central Universities
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Reported herein is a novel visible-light photoredox system with Pd(PPh3)(4) as the sole catalyst for the realization of the first direct cross-coupling of C(sp(3))-H bonds in N-aryl tetrahydroisoquinolines with unactivated alkyl bromides. Moreover, intra- and intermolecular alkylations of heteroarenes were also developed under mild reaction conditions. A variety of tertiary, secondary, and primary alkyl bromides undergo reaction to generate C(sp(3))-C(sp(3)) and C(sp(2))-C(sp(3)) bonds in moderate to excellent yields. These redox-neutral reactions feature broad substrate scope (>60 examples), good functional-group tolerance, and facile generation of quaternary centers. Mechanistic studies indicate that the simple palladium complex acts as the visible-light photocatalyst and radicals are involved in the process.
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