Spirolactones from Dirhodium(II)-Catalyzed Diazo Decomposition with Regioselective Carbon-Hydrogen Insertion
作者:Michael P. Doyle、Alexey B. Dyatkin
DOI:10.1021/jo00115a018
日期:1995.5
Dirhodium(II) caprolactamate, Rh-2(cap)(4), catalyzes diazo decomposition of cycloalkylmethyl diazoacetates which form spirolactones in moderate to high yield by insertion into a tertiary carbon-hydrogen bond. Similar results are obtained with diazoacetates derived from tetrahydropyran-2-methanol and tetrahydrofurfuryl alcohol but not from cyclopropylmethanol. With tetrahydrofuran-3-ylmethyl diazoacetate, Rh-2(cap)(4) catalysis promotes delta-lactone formation via insertion into the oxygen-activated secondary C-H bond instead of gamma-lactone formation by carbene insertion into the unactivated tertiary C-H bond. However, when both 1,5- and 1,6-positions are activated for insertion by adjacent oxygen atoms, as in (2,2-dimethyl-1,3-dioxolan-4-yl)methyl diazoacetate, five-membered ring formation occurs exclusively in Rh-2(cap)(4)-catalyzed reactions, whereas use of dirhodium(II) acetate leads to both insertion products.
Sircar, Journal of the Chemical Society, 1928, p. 901
作者:Sircar
DOI:——
日期:——
METALLKOMPLEXE
申请人:Merck Patent GmbH
公开号:EP3044284B1
公开(公告)日:2019-11-13
Metal Complexes
申请人:MERCK PATENT GMBH
公开号:US20160233443A1
公开(公告)日:2016-08-11
The invention relates to metal complexes and to electronic devices, in particular organic electroluminescence devices, containing said metal complexes.