期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 3, 页码 846-851出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201409186
关键词
C-H activation; cross-coupling; boron; iridium; small ring systems
资金
- Funding Program for Next Generation World-Leading Researchers from JSPS
- MEXT [25105720, 25708005]
- World Premier International Research Center (WPI) Initiative (Japan)
- Grants-in-Aid for Scientific Research [25708005, 25105720] Funding Source: KAKEN
A step-economical and stereodivergent synthesis of privileged 2-arylcyclopropylamines (ACPAs) through a C-(sp(3))-H borylation and Suzuki-Miyaura coupling sequence has been developed. The iridium-catalyzed C-H borylation of N-cyclopropylpivalamide proceeds with cis selectivity. The subsequent B-cyclopropyl Suzuki-Miyaura coupling catalyzed by [PdCl2(dppf)]/Ag2O proceeds with retention of configuration at the carbon center bearing the Bpin group, while epimerization at the nitrogen-bound carbon atoms of both the starting materials and products is observed under the reaction conditions. This epimerization is, however, suppressed in the presence of O-2. The present new ACPA synthesis results in not only a significant reduction in the steps required for making ACPA derivatives, but also the ability to access either isomer (cis or trans) by simply changing the atmosphere (N-2 or O-2) in the coupling stage.
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