期刊
TETRAHEDRON
卷 70, 期 27-28, 页码 4257-4263出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2014.03.039
关键词
Enantiospecific cross coupling; Nickel catalysis; Carbon-nitrogen bond activation; Benzylic electrophiles
资金
- NIH, United States (COBRE) [P20 GM103541]
- University of Delaware
- NSF, United States (NSF) [CHE 0421224, CHE 1229234, CHE 0840401]
- NIH, United States (NIH) [P20 GM103541, S10 RR026962]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1229234] Funding Source: National Science Foundation
Highly improved conditions for the enantiospecific cross coupling of benzylic ammonium triflates with boronic acids are reported. This method relies on the use of Ni(cod)(2) without ancillary phosphine or N-heterocyclic carbene ligands as catalyst. These conditions enable the coupling of new classes of boronic acids and benzylic ammonium triflates. In particular, both heteroaromatic and vinyl boronic acids are well tolerated as coupling partners. In addition, these conditions enable the use of ammonium triflates with a variety of substituents at the benzylic stereocenter. Further, naphthyl-substitution is not required on the benzylic ammonium triflate; ammonium triflates with simple aromatic substituents also undergo this coupling. Good to high yields and levels of stereochemical fidelity are observed. This new catalyst system greatly expands the utility of enantiospecific cross couplings of these amine-derived substrates for the preparation of highly enantioenriched products. (C) 2014 Elsevier Ltd. All rights reserved.
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