Indium-Mediated Deoxygenation of Nitrones, N-Oxides and Deoxygenative Reductive Coupling of Nitrones to Vicinal Diamines
摘要:
We reported transformation of nitrones selectively either to aldamines or vicinal diamines and deoxygenation of N-oxides using Indium at ambient temperature in good yields.
The coordination chemistry of molybdenum and tungsten. Part XVI. Oxomolybdenum(V) and oxotungsten(V) complexes containing neutral monodentate and anionic bidentate Schiff base ligands
作者:C.A. Rice、C.G. Benson、C.A. McAuliffe、W.E. Hill
DOI:10.1016/s0020-1693(00)87304-1
日期:1982.1
ligands with phenolic, imine and various side chain donors yields complexes of type [MOCl3(ligand)2] in which the ligand generally binds as a neutral monodentate imine donor. Electron spin resonance spectra suggest that these complexes have a cis-mer structure. These complexes are not converted to the bidentate anionic ligand complexes [MoOCl(L)2] by refluxing in alcohols, but the latter may be prepared
Palladium-Catalyzed Regioselective C-Benzylation via a Rearrangement Reaction: Access to Benzyl-Substituted Anilines
作者:Manuel Amézquita-Valencia、Howard Alper
DOI:10.1002/chem.201603941
日期:2016.11.14
An unprecedented C‐benzylation rearrangementreaction, catalyzed by palladium, is reported. The reaction proceeds by rearrangement leading to the direct synthesis of para or ortho benzyl‐substituted N‐methylanilines. The product is obtained in high regioselectivity, without the need to use a ligand for the catalytic process.
Some dichloro Schiff base complexes of molybdenum(IV)
作者:Chi-Tat Kan
DOI:10.1039/dt9820002309
日期:——
A series of molybdenum(IV) complexes of the type [MoCl2L2], where HL represents N-phenylsalicylideneimine and its derivatives, have been synthesised by reaction of [MoCl2(acac)2](acac = acetylacetonate) or [MoCl4(MeCN)2] with related Schiff bases. The spectroscopic properties of these six-co-ordinate d2 complexes are discussed.
The reactions of salicylaldimines with electron‐rich alkenes (2,3‐dihydro‐2H‐furan and 3,4‐dihydro‐2H‐pyran) catalyzed by N,N′‐dioxide–Sc(OTf)3complexes were investigated. The methodology was successfully applied to the asymmetricsynthesis of cis‐4‐aminobenzopyran derivatives. Excellent yields, diastereo‐ and enantioselectivities were observed for a broad range of substrates under mild conditions
A highly enantioselective synthesis of 3,4-diaminochroman-2-ones has been realized via the domino reaction of o-hydroxy aromatic aldimines and azlactones. Notably, a cis-product was obtained as the major product by the use of guanidine 2a whereas a trans-product was the major product with bisguanidium salt 3•HBArF4. In two cases, various substituted 3,4-dihydrocoumarins were obtained with high yields
通过邻羟基芳族醛亚胺和a内酯的多米诺反应,已经实现了对3,4-二氨基苯并二氢吡喃-2-酮的高度对映选择性的合成。值得注意的是,通过使用胍2a获得了顺式产物作为主要产物,而反式产物是双胍盐3•HBAr F 4的主要产物。在两种情况下,以高收率(高达99%),出色的对映选择性(高达99%ee)和非对映选择性(高达> 99:1顺式:反式和98:2 )获得了各种取代的3,4-二氢香豆素。反式:顺式,分别)在温和的反应条件下。