[EN] SUBSTITUTED 3-AMINO-THIENO[2,3-b]PYRIDINE-2-CARBOXYLIC ACID AMIDE COMPOUNDS AND PROCESSES FOR PREPARING AND THEIR USES [FR] COMPOSES AMIDE D'ACIDE 3-AMINO-THIENO[2,3-b]PYRIDINE-2-CARBOXYLIQUE SUBSTITUES ET PROCESSUS DE PREPARATION ET D'UTILISATION DE CES COMPOSES
Studies on transannulation reactions across a nine-membered ring: the synthesis of natural product-like structures
作者:Mudassar Iqbal、Richard J. G. Black、Joby Winn、Andrew T. Reeder、Alexander J. Blake、Paul A. Clarke
DOI:10.1039/c1ob05448a
日期:——
transannulation reactions across a cyclononene ring. Transannularcyclisations through oxygen functionality have generated a number of bicyclo[5.3.1]systems containing bridged cyclic ethers and bicyclo[5.2.2]lactones, as well as a tetrahydrofuran-containing bridged analogue of hexacyclinic acid. An unprecedented Brønsted acid mediated transannularcyclisation between proximal carbons generated bicyclo[4.3
Intramolecular Simmons−Smith Cyclopropanation. Studies into the Reactivity of Alkyl-Substituted Zinc Carbenoids, Effect of Directing Groups and Synthesis of Bicyclo[<i>n</i>.1.0]alkanes
作者:James A. Bull、André B. Charette
DOI:10.1021/ja907504w
日期:2010.2.17
explored. Substitution on the alkene and at the allylic position was well tolerated, providing the bicyclic products in high yields. Additionally, the IMSS reaction allowed a highly diastereoselective synthesis of a 5-3-5 fused tricycloalkane. These studies will have implications for the use of substituted carbenoids in cyclopropanation reactions and for directed cyclopropanation reactions as well as in
已经开发了分子内 Simmons-Smith (IMSS) 环丙烷化,为构建取代的双环烷烃提供了一种新方法。首先,以高收率制备了含有烯丙醇的功能化的偕二碘烷烃。然后研究了分子内环化形成不同环大小的过程,并证明可以成功合成双环[3.1.0]己烷和双环[4.1.0]庚烷。更大的链长导致含末端烯烃的产物。Analysis of the product distribution for the different ring sizes and under various reaction conditions provided insight into the reactivity of substituted zinc carbenoids, and by the appropriate choice of conditions cyclopropanation could be promoted
Synthesis of an austrodorane sesquiterpenoid core via a transannular Prins cyclization
作者:Paul A. Clarke、Joby Winn
DOI:10.1016/j.tetlet.2011.01.093
日期:2011.3
The bicyclo[4.3.0]nonane core of the austrodorane family of sesquiterpenoids has been synthesized via a noveltransannular Prins cyclization. This strategy formed the fused 5,6-ring system and installed the required quaternary stereocentre at the ring fusion in a single step.
Nickel-Catalyzed Enantioselective Coupling of Aldehydes and Electron-Deficient 1,3-Dienes Following an Inverse Regiochemical Course
作者:Thomas Q. Davies、Jae Yeon Kim、Alois Fürstner
DOI:10.1021/jacs.2c09328
日期:2022.10.19
The nickel catalyzed reductive coupling of aldehydes with sorbate esters and related electron-deficient 1,3-dienes are known in the literature to occur at the π-bond proximal to the ester to afford aldol-type products. In stark contrast to this established path, a VAPOL-derived phosphoramidite ligand in combination with a bench-stable nickel precatalyst brokers a regiocomplementary course in that C–C