Palladium-Catalyzed Enantioselective Relay Heck Arylation of Enelactams: Accessing α,β-Unsaturated δ-Lactams
作者:Qianjia Yuan、Matthew S. Sigman
DOI:10.1021/jacs.8b02752
日期:2018.5.30
In this Communication, we describe the construction of chiral α,β-unsaturated δ-lactams, widely used as pharmacophores, in high yields and excellent enantioselectivities using an oxidative relay Heckarylation reaction. This strategy also allows facile access to 7-substituted α,β-unsaturated ε-lactam products and δ-lactams containing a tetrasubstituted nitrogen-bearing stereocenter.
Elektrophile α-Amidoalkylierungen mit Enamiden nach einem neuen Aktivierungsverfahren mitO,O′-Dimethyldithiophosphorsäure
作者:Klaus Th. Wanner、Cornelia Wolf
DOI:10.1002/ardp.19933261006
日期:——
Doppelbindungsisomerisierung werden aus den Allylamiden 3 die Enamide 4 dargestellt. 4a‐d und 10 werden in einer elektrophilen α‐Amidoalkylierungsreaktion mit dem Silylenolether 6 zu den Amidoketonen 8a‐d und 12 umgesetzt. Die Enamide werden dabei durch Umsetzung mitO,O′‐Dimethyldithiophosphorsäure (5) und SnCl4 aktiviert.
Durch Pd-C-katalysierte Doppelbindungsisomerisierung werden aus den Allylamiden 3 die Enamide 4 dargestellt。4a-d 和 10 werden in einer elektrophilen α-Amidoalkylierungsreaktion mit dem Silylenolether 6 zu den Amidoketonen 8a-d und 12 umgesetzt。Die Enamide werden dabei durch Umsetzung mit O,O'-Dimethyldithiophosphorsäure (5) 和 SnCl4 活性。
Asymmetric heck reaction of alkenyl iodides in the presence of silver salts. Catalytic asymmetric synthesis of decalin and functionalized indolizidine derivatives
Decalin derivatives3 (up to 80% ee) and indolizidine derivative 6 (up to 86% ee) have been synthesized by an asymmetric Heck reaction starting with prochiral alkenyl iodides 1 and 4, respectively. The important role of silver salts in the asymmetric Heck reaction is discussed, and the conversion of 6 to δ-coniceine (24) is also described.
Palladium‐Catalyzed Enantioselective Alkenylation of Enelactams Using a Relay Heck Strategy
作者:Qianjia Yuan、Matthew S. Sigman
DOI:10.1002/chem.201902813
日期:2019.8.14
In this report, a palladium-catalyzed redox-relay Heck process to access optically active alkenylated α,β-unsaturated lactams is described. Under mildreaction conditions, electron-deficient alkenyl triflates and electron-rich alkenyliodoniumsalts undergo enantioselective and site-selective coupling with enelactams to deliver the products in high yields and excellent enantioselectivities. Furthermore
Imidazole group containing 2(1H)-pyridones and method for treating heart
申请人:A. Nattermann & Cie GmbH
公开号:US04699914A1
公开(公告)日:1987-10-13
The present invention is directed to new, an imidazole group containing 2(1H)-pyridones of formula I ##STR1## salts thereof and process for treating congestive heart failure in humans.