Nickel-catalyzed transamidation of aliphatic amide derivatives
Open Access
- 10 July 2017
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Chemical Science
- Vol. 8 (9), 6433-6438
- https://doi.org/10.1039/c7sc01980g
Abstract
Transamidation, or the conversion of one amide to another, is a long-standing challenge in organic synthesis. Although notable progress has been made in the transamidation of primary amides, the transamidation of secondary amides has remained underdeveloped, especially when considering aliphatic substrates. Herein, we report a two-step approach to achieve the transamidation of secondary aliphatic amides, which relies on non-precious metal catalysis. The method involves initial Boc-functionalization of secondary amide substrates to weaken the amide C–N bond. Subsequent treatment with a nickel catalyst, in the presence of an appropriate amine coupling partner, then delivers the net transamidated products. The transformation proceeds in synthetically useful yields across a range of substrates. A series of competition experiments delineate selectivity patterns that should influence future synthetic design. Moreover, the transamidation of Boc-activated secondary amide derivatives bearing epimerizable stereocenters underscores the mildness and synthetic utility of this methodology. This study provides the most general solution to the classic problem of secondary amide transamidation reported to date.Keywords
Funding Information
- Division of Graduate Education (DGE-1144087)
- Division of Chemistry (CHE-1048804)
- National Institute of General Medical Sciences (R01-GM117016, T32-GM067555)
- National Center for Research Resources (S10RR025631)
- University of California, Los Angeles
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