Reductive Amination/Cyclization of Keto Acids Using a Hydrosilane for Selective Production of Lactams versus Cyclic Amines by Switching of the Indium Catalyst
作者:Yohei Ogiwara、Takuya Uchiyama、Norio Sakai
DOI:10.1002/anie.201509465
日期:2016.1.26
amines by reductive amination, using an indium/silane combination. This relatively benign and safe catalyst/reductant system tolerates the use of a variety of functional groups, especially ones that are reduction‐sensitive. A direct switch from synthesizing lactams to synthesizing cyclic amines is achieved by changing the catalyst from In(OAc)3 to InI3. This conversion occurs by further reduction of the
Synthesis of Tricyclic Nitrogen Heterocycles by a Sequence of Palladium-Catalyzed N–H and C(sp<sup>3</sup>)–H Arylations
作者:Mathieu Guyonnet、Olivier Baudoin
DOI:10.1021/ol2031763
日期:2012.1.6
A range of tricyclic nitrogenheterocycles were synthesized in a straightforward and efficient manner via a sequence involving palladium-catalyzed N-arylation and C(sp3)–H arylation as the key steps. Whereas the C(sp3)–H arylation furnished fused 6,5,6-membered ring systems efficiently, the formation of the more strained 6,5,5-membered systems proved to be more challenging and required a subtle adjustment
Facile cyclization of amidyl radicals generated from N-acyltriazenes
作者:Hongjian Lu、Chaozhong Li
DOI:10.1016/j.tetlet.2005.07.023
日期:2005.9
N-Acyltriazenes serve as a tin-free and initiator-free source for amidylradicals. Thermal decomposition of N,N′-diaryl-N-(4-pentenoyl)triazenes in refluxing toluene led to the formation of monocyclic and tricyclic lactams in satisfactory yields via 5-exoamidylradicalcyclization.
Highly Efficient and Versatile Synthesis of Lactams and <i>N</i>-Heterocycles via Al(OTf)<sub>3</sub>-Catalyzed Cascade Cyclization and Ionic Hydrogenation Reactions
The discovery and development of an efficient and versatile method for the synthesis of N-substituted lactams is described. Pyrrolindinones, piperidones, and structurally related heterocycles were formed by Al(OTf)3-catalyzed cascade cyclization and ionic hydrogenation reactions of corresponding nitrogen substituted ketoamides in good yields.
A Catalyst and Solvent Free Route for the Synthesis of
<i>N</i>
‐Substituted Pyrrolidones from Levulinic Acid
作者:Pritam Dolui、Vikas Tiwari、Parul Saini、Tarak Karmakar、Koushik Makhal、Harshita Goel、Anil J. Elias
DOI:10.1002/chem.202200829
日期:2022.8
This work offers a simple methodolgy to avoid solvents and added catalysts for the synthesis of different kinds of N-substituted pyrrolidones. Different aniline derivatives with varying steric and electronic demands, aliphatic amines and benzyl amines were responsive to this methodology. The method was also modified for the synthesis of industrially important γ-valerolactone. Control experiments and