A Ru carbene (8, Scheme 2) that contains an internal metal-oxygen chelate is an active metathesis catalyst and is readily obtained by the sequential treatment of Cl2Ru(PPh3)(3) with (2-isopropoxyphenyl)-diazomethane and PCy3. This Ru-carbene complex offers excellent stability to air and moisture and can be recycled in high yield by silica gel column chromatography. The structures of this and related complexes have been unambiguously established by NMR and single-crystal X-ray diffraction studies.
A Ru carbene (8, Scheme 2) that contains an internal metal-oxygen chelate is an active metathesis catalyst and is readily obtained by the sequential treatment of Cl2Ru(PPh3)(3) with (2-isopropoxyphenyl)-diazomethane and PCy3. This Ru-carbene complex offers excellent stability to air and moisture and can be recycled in high yield by silica gel column chromatography. The structures of this and related complexes have been unambiguously established by NMR and single-crystal X-ray diffraction studies.
Rhodium ion catalyzed decomposition of aryldiazoalkanes
作者:B.K.Ravi Shankar、Harold Shechter
DOI:10.1016/s0040-4039(00)87320-7
日期:1982.1
Aryldiazomethanes are converted by rhodium(II) acetate and iodorhodium(III) tetraphenylporphyrin to cis- rather than trans-1,2-diarylethylenes. Secondary aryldiazoalkanes react with rhodirum(II) acetate to give azines.
Cyclopropanation using flow-generated diazo compounds
作者:Nuria M. Roda、Duc N. Tran、Claudio Battilocchio、Ricardo Labes、Richard J. Ingham、Joel M. Hawkins、Steven V. Ley
DOI:10.1039/c5ob00019j
日期:——
A practical and mild protocol for the cyclopropanation of unstabilised diazo compounds is reported.
一种实用且温和的方法用于环丙烷化不稳定的重氮化合物。
N−N Bond Cleavage in Diazoalkanes by a Bis(imino)pyridine Iron Complex
作者:Sarah K. Russell、Emil Lobkovsky、Paul J. Chirik
DOI:10.1021/ja8075132
日期:2009.1.14
Addition of monosubstituted diazoalkanes, N(2)CHR (R = Ph, p-Tolyl, (t)Bu, Cy), to the bis(imino)pyridine iron dinitrogen complex, ((iPr)PDI)Fe(N(2))(2), at 23 degrees C in benzene-d(6) resulted in rapid cleavage of the N-N bond to yield the iron nitrile and imine complexes, ((iPr)PDI)FeNCR and ((iPr)PDI)FeHNCHR, respectively. Aryl azines were also cleaved with ((iPr)PDI)Fe(N(2))(2) and yielded the
An Enantioselective Synthesis of 2-Aryl Cycloalkanones by Sc-Catalyzed Carbon Insertion
作者:Victor L. Rendina、David C. Moebius、Jason S. Kingsbury
DOI:10.1021/ol200402m
日期:2011.4.15
Current methods for asymmetric alpha-arylation require blocking groups to prevent reaction at the alpha'-carbon, basic conditions that promote racemization, or multistep synthesis. This work records the first catalytic enantioselective examples of the diazoalkane-carbonyl homologation reaction. Medium ring 2-aryl ketones are prepared in one step in up to 98:2 er and 99% yield from the unsubstituted lower homologue by Sc-catalyzed aryldiazomethyl insertion with simple bis- and tris(oxazoline) ligands.