Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 11, Pages 5407-5414Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.5b00920
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Funding
- MEXT, Japan [26248030]
- MEXT program for promoting the enhancement of research universities [25105739]
- Grants-in-Aid for Scientific Research [25105739, 26870389] Funding Source: KAKEN
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The current work describes the marked rate of acceleration caused by phosphine ligands on the rhodium-catalyzed dehydrogenative silylation and germylation of unactivated C(sp(3))-H bonds. The reactivity was affected by the steric and electronic nature of the phosphine ligands. The use of the bulky and electron-rich diphosphine ligand (R)-DTBM-SEGPHOS was highly effective to yield the dehydrogenative silylation products selectively in the presence of a hydrogen acceptor. An appropriate choice of C-2-symmetric chiral diphosphine ligand enables the asymmetric dehydrogenative silylation via the enantioselective desymmetrization of the C(sp(3))-H bond. The unprecedented catalytic germylation of C(sp(3))-H bonds with dehydrogenation was also examined with the combination of the rhodium complex and a wide bite angle diphosphine ligand to provide the corresponding 2,3-dihydrobenzo[b]germoles in good yield.
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