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
processes for their production are scarce and would greatly benefit from further investigations. Herein, we demonstrate that an iridium‐based photocatalyst promotes the direct reductive cross‐coupling of imines with olefins upon irradiation with visible light to give GABA derivatives in good yields and selectivities. We also stress the enabling triple role of tributylamine additive in this process
There is disclosed a lactam derivative of the formula: ##STR1## wherein R.sup.1 is a substituted or unsubstituted phenyl group; R.sup.2 is a substituted or unsubstituted phenyl group, a cycloalkyl group or a nitrogen-containing 6-membered heterocyclic group; Z is oxygen atom or sulfur atom; and n is an integer of 2 or 3, and a salt thereof. The above lactam derivative is novel and useful as a pharmaceutical compound.
The Catalyst-Controlled Divergent Cascade Reactions of Homo-Propargylic Amines and Nitrones: Synthesis of Pyrrolo-Isoxazolidines and γ-Lactams
作者:Yuanfang Kong、Yingze Liu、Boyi Wang、Shengli Li、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1002/adsc.201701476
日期:2018.3.20
Two controllable one‐pot cascade cyclization reactions of homopropargylic amines and nitrones were developed by using different metal Cu and Ag salts. The pyrroloisoxazolidines and γ‐lactams were obtained in good to high yields, respectively. Herein, nitrones played dual roles, both as 1,3‐dipoles and oxidants, and four stereocenters were simultaneously formed in the hydroamination cyclization‐1,3‐dipolar
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.