Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 19, Pages 7397-7402Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201916530
Keywords
C-H functionalization; donor; acceptor carbenes; heterocycles; rhodium; synthetic methods
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Funding
- National Science Foundation [CHE-1700982] Funding Source: Medline
- NIGMS NIH HHS [R01 GM099142] Funding Source: Medline
- NIH HHS [GM099142] Funding Source: Medline
- Research Council of Norway [288665] Funding Source: Medline
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Regio- and stereoselective distal allylic/benzylic C-H functionalization of allyl and benzyl silyl ethers was achieved using rhodium(II) carbenes derived from N-sulfonyltriazoles and aryldiazoacetates as carbene precursors. The bulky rhodium carbenes led to highly site-selective functionalization of less activated allylic and benzylic C-H bonds even in the presence of electronically preferred C-H bonds located alpha to oxygen. The dirhodium catalyst Rh-2(S-NTTL)(4) is the most effective chiral catalyst for triazole-derived carbene transformations, whereas Rh-2(S-TPPTTL)(4) works best for carbenes derived from aryldiazoacetates. The reactions afford a variety of delta-functionalized allyl silyl ethers with high diastereo- and enantioselectivity. The utility of the present method was demonstrated by its application to the synthesis of a 3,4-disubstituted l-proline scaffold.
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