1,2,3-Trimethoxybenzene reacts with BF4Mn(CO)5 in CH2Cl2 or ClMn(CO)5 in CF3CO2H then with HPF6 to afford 1,2,3-tri-methoxybenzene manganesetricarbonyl tetrafluoroborate 2aor hexafluorophosphate 2b, the X-ray structure of which indicates an arene nonplanarity and an eclipsed conformation of C1, C3 and C5 carbons; LiEt3BH, EtMgBr, and SiR3CHLiCN (R = Me, i-Pr) additions occur mainly on the C5 eclipsed
Conjugate addition reaction of trimethylsilylacetonitrile with α,β-unsaturated carbonyl compounds. Synthetic studies toward sesbanimide
作者:Kiyoshi Tomioka、Kenji Koga
DOI:10.1016/s0040-4039(01)90021-8
日期:1984.1
Lithiated trimethylsilylacetonitrile was allowed to react with some α,β-unsaturated carbonylcompounds to give the corresponding conjugateaddition products.
Cobalt carbonyl-catalyzed carbonylation of functionalized aziridines to versatile β-lactam building blocks
作者:Nicola Piens、Kristof Van Hecke、Dieter Vogt、Matthias D'hooghe
DOI:10.1039/c7ob00832e
日期:——
carbonylation of different classes of non-activated aziridines with diverse substitution patterns was investigated. Special attention was devoted to selectivity issues and reaction optimization. This study resulted in the regio- and stereospecific synthesis of 24 novel β-lactam target structures in high yields on a multigram scale. The synthetic potential of the newly obtained azetidin-2-ones was illustrated
Tandem Cationic <i>aza</i>-Cope Rearrangement−Mannich Cyclization Approach to the Core Structure of FR901483 via a Bridgehead Iminium Ion
作者:Kay M. Brummond、Jianliang Lu
DOI:10.1021/ol010029n
日期:2001.5.1
[GRAPHICS]An approach to the potent immunosuppressant FR901483 is described, This route utilizes a tandem cationic aza-Cope rearrangement-Mannich cyclization to generate the core structure of this compound. In addition, this is the first demonstration of this tandem reaction passing through a bridgehead iminium ion.