Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 51, Pages 15525-15529Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507167
Keywords
carbenes; cyclopropanation; gold; nitrogen heterocycles; ynamides
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Funding
- EPSRC
- AstraZeneca plc
- University of Birmingham
- Engineering and Physical Sciences Research Council [970746] Funding Source: researchfish
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Gold carbene reactivity patterns were accessed by ynamide insertion into a C(sp(3))-H bond. A substantial increase in molecular complexity occurred through the cascade polycyclization of N-allyl ynamides to form fused nitrogen-heterocycle scaffolds. Exquisite selectivity was observed despite several competing pathways in an efficient gold-catalyzed synthesis of densely functionalized C(sp(3))-rich polycycles and a copper-catalyzed synthesis of fused pyridine derivatives. The respective gold-keteniminium and ketenimine activation pathways have been explored through a structure-reactivity study, and isotopic labeling identified turnover-limiting C-H bond-cleavage in both processes.
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