123993-97-5Relevant articles and documents
Site-Selective Nitrene Transfer to Conjugated Olefins Directed by Oxazoline Peptide Ligands
Storch, Golo,van den Heuvel, Naudin,Miller, Scott J.
supporting information, p. 289 - 294 (2019/08/30)
Site-selective nitrene transfer to di- and polyene substrates has been achieved using designed peptide-embedded bioxazoline ligands capable of binding copper. In model 1,3-diene substrates, the olefinic position proximal to a directing group was selectively functionalized. Additional studies indicate that this selectivity stems from non-covalent substrate-catalyst interactions. The peptide-mediated nitrene transfer was also applied to polyene natural product retinol and selective proximal functionalization allowed access to a cis-pyrroline modified retinoid. (Figure presented.).
Triiodide-Mediated δ-Amination of Secondary C?H Bonds
Wappes, Ethan A.,Fosu, Stacy C.,Chopko, Trevor C.,Nagib, David A.
, p. 9974 - 9978 (2016/08/16)
The Cδ?H amination of unactivated, secondary C?H bonds to form a broad range of functionalized pyrrolidines has been developed by a triiodide (I3?)-mediated strategy. By in situ 1) oxidation of sodium iodide and 2) sequestration of the transiently generated iodine (I2) as I3?, this approach precludes undesired I2-mediated decomposition which can otherwise limit synthetic utility to only weak C(sp3)?H bonds. The mechanism of this triiodide-mediated cyclization of unbiased, secondary C(sp3)?H bonds, by either thermal or photolytic initiation, is supported by NMR and UV/Vis data, as well as intercepted intermediates.
Gold versus silver-catalyzed intermolecular hydroaminations of alkenes and dienes
Giner, Xavier,Najera, Carmen,Kovacs, Gabor,Lledos, Agusti,Ujaque, Gregori
experimental part, p. 3451 - 3466 (2012/02/04)
Comparative studies about the hydroamination of unactivated alkenes and dienes catalyzed by either cationic gold(I) triphenyl phosphite complexes or silver salts were performed using sulfonamides, anilines and carbamates as nucleophiles. Gold-catalyzed reactions generally, need lower loadings than those carried out with silver salts. Simple alkenes react only with sulfonamides and weak aromatic amines such as p-nitroaniline, whereas for conjugated dienes carbamates can also be used. Carbon-carbon double bond isomerization is observed only with gold similarly to when triflic acid was used, affording mixtures of regioisomeric products in the same cases. Silver-catalyzed hydroaminations failed with terminal alkenes, except with styrenes. Conjugate dienes can be hydroaminated either at 85 °C in toluene or at room temperature in dichloromethane. Non-conjugated 1,4- and 1,5-dienes suffer double hydroamination leading to saturated N-tosylated heterocyclic amines The catalytic cycle for the silver(I)-catalyzed hydroamination process has been computationally analyzed, resembling gold(I)-catalyzed processes, although with some significant differences. Copyright
Pyrrolidine and piperidine formation via copper(II) carboxylate-promoted intramolecular carboamination of unactivated olefins: Diastereoselectivity and mechanism
Sherman, Eric S.,Fuller, Peter H.,Kasi, Dhanalakshmi,Chemler, Sherry R.
, p. 3896 - 3905 (2008/02/01)
(Chemical Equation Presented) An expanded substrate scope and in-depth analysis of the reaction mechanism of the copper(II) carboxylate-promoted intramolecular carboamination of unactivated alkenes is described. This method provides access to N-functionalized pyrrolidines and piperidines. Both aromatic and aliphatic γ- and δ-alkenyl N-arylsulfonamides undergo the oxidative cyclization reaction efficiently. N-Benzoyl-2-allylaniline also underwent the oxidative cyclization. The terminal olefin substrates examined were more reactive than those with internal olefins, and the latter terminated in elimination rather than carbon-carbon bond formation. The efficiency of the reaction was enhanced by the use of more organic soluble copper(II) carboxylate salts, copper(II) neodecanoate in particular. The reaction times were reduced by the use of microwave heating. High levels of diastereoselectivity were observed in the synthesis of 2,5-disubstituted pyrrolidines, wherein the cis substitution pattern predominates. The mechanism of the reaction is discussed in the context of the observed reactivity and in comparison to analogous reactions promoted by other reagents and conditions. Our evidence supports a mechanism wherein the N-C bond is formed via intramolecular syn aminocupration and the C-C bond is formed via intramolecular addition of a primary carbon radical to an aromatic ring.
Gold(I)-catalyzed intra- and intermolecular hydroamination of unactivated olefins
Zhang, Junliang,Yang, Cai-Guang,He, Chuan
, p. 1798 - 1799 (2007/10/03)
Ph3PAuOTf catalyzes efficient intra- and intermolecular hydroamination of unactivated olefins with sulfonamides. Copyright
A Stereocontrolled Organopalladium Route to 2,5-Disubstituted Pyrrolidine Derivatives. Application to the Synthesis of a Venom Alkaloid of the Ant Species Monomorium latinode
Baeckvall, Jan-E.,Schink, Hans E.,Renko, Z. Dolor
, p. 826 - 831 (2007/10/02)
A general method for the preparation of cis- and trans-2,5-disubstituted pyrrolidines from conjugated dienes has been developed.The approach involves a stereocontrolled syn- or anti-1,4-addition of an amino and an oxygen function to the diene via palladiu
