Pd(0)-catalyzed atom transfer radical cyclization of N-allyl-α-chloroamides: highly stereoselective synthesis of substituted γ-lactam
摘要:
A catalysis system comprised of Pd(cod)Cl-2 precursor and IMes ligand has been developed, which is efficient to catalyze the atom transfer radical cyclization of N-allyl-alpha-chloroamides with the help of NaI additive. This reaction provides a facile access to beta-iodomethyl-gamma-lactam with high stereoselectivity. Moreover, the results from the reaction of deuterium-labeled substrate and TEMPO-trapping experiment clearly indicate that radical intermediate(s) should be involved in the reaction. (C) 2015 Elsevier Ltd. All rights reserved.
Palladium-catalyzed cyclization/cyclopropanation reaction for the synthesis of fused N-containing heterocycles
作者:Sukla Nandi、Jayanta K. Ray
DOI:10.1016/j.tetlet.2009.09.156
日期:2009.12
Palladium-catalyzedcyclization/cyclopropanation can be used to convert a range of substituted cyclic N-aryl allyl/methallyl amines efficiently and selectively to the corresponding fused tetrahydropyridine/cyclopropane-fused isoquinoline derivatives via β-hydrogen elimination or a domino sequence.
Vizgert,R.V. et al., Journal of Organic Chemistry USSR (English Translation), 1969, vol. 5, p. 914 - 919
作者:Vizgert,R.V. et al.
DOI:——
日期:——
Synthesis of pyrrolidines and pyrrolidinones by the rhodium complex catalyzed cyclization of unsaturated amines
作者:Jian Qiang Zhou、Howard Alper
DOI:10.1021/jo00038a019
日期:1992.6
N-Allylic arylamines react with carbon monoxide, sodium borohydride, 2-propanol, and catalytic amounts of the zwitterionic complex eta-6-C6H6BPh3-Rh(COD)+ (1), to form pyrrolidines as the main products in most cases. Pyrrolidinones result from N-allylic alkylamines. An alternate route to the lactams from N-allylic alkylamines involves synthesis gas instead of CO/NaBH4, together with the dual catalytic system 1/[Ru(CO)3Cl2]2. Complementary to the N-allylic arylamine route to pyrrolidines with NaBH4 and 1 is the use of synthesis gas, 1, and 1,4-bis(diphenylphosphino)butane.
Catalytic, Atom-Economical Radical Arylation of Epoxides
作者:Andreas Gansäuer、Maike Behlendorf、Daniel von Laufenberg、André Fleckhaus、Christian Kube、Dhandapani V. Sadasivam、Robert A. Flowers
DOI:10.1002/anie.201200431
日期:2012.5.7
A slow electron waltz: Catalysis in single‐electron steps with radicals as intermediates is essential for an atom‐economical arylation of epoxides with a proton‐coupled electron transfer as a key step. Stabilization of the catalyst is essential for low catalyst loading, as demonstrated by reaction‐progress kinetic analysis, cyclic voltammetry, and calculations.