Asymmetric Counteranion-Directed Transition-Metal Catalysis: Enantioselective Epoxidation of Alkenes with Manganese(III) Salen Phosphate Complexes
作者:Saihu Liao、Benjamin List
DOI:10.1002/anie.200905332
日期:2010.1.12
Paired up: A highly active and enantioselective ion‐pair epoxidationcatalyst, consisting of an achiral MnIII–salen complex and a chiral phosphate counteranion, mediates the epoxidization of a wide range of alkenes with high yields and enantioselectivities (see scheme). The unique role of the counteranion is to stabilize an enantiomorphic conformation of the cationic Mn catalyst.
配对:高活性和对映选择性离子对环氧化催化剂,由非手性Mn III -salen配合物和手性磷酸抗衡阴离子组成,可介导高产率和对映选择性的多种烯烃的环氧化。抗衡阴离子的独特作用是稳定阳离子Mn催化剂的对映体构象。
Copper-Catalyzed Intramolecular Carbotrifluoromethylation of Alkynes for the Construction of Trifluoromethylated Heterocycles
作者:Yanan Wang、Min Jiang、Jin-Tao Liu
DOI:10.1002/chem.201404386
日期:2014.11.17
A mild and efficient copper‐catalyzed intramolecularcarbotrifluoromethylation of alkynes has been achieved in the presence of Togni reagent as trifluoromethylating reagent. The reaction tolerates a range of substrates to give a group of trifluoromethylatedheterocycles with high selectivities. A plausible mechanism was proposed on the basis of experimental results.
Anti-hypertensive derivatives of trans-3-hydroxy-4-amino-chroman, their preparation from amines and chroman epoxide derivatives, and pharmaceutical compositions containing such anti-hypertensive derivatives for reducing blood pressure in mammals including humans.
Copper(I) Iodide: A Catalyst for the Improved Synthesis of Aryl Propargyl Ethers
作者:David Bell、Mark R. Davies、Graham R. Geen、Inderjit S. Mann
DOI:10.1055/s-1995-3977
日期:1995.6
Copper(I) iodide catalyses the reaction between phenols and dialkylpropargyl chlorides to give aryl 1,1-dialkylpropargyl ethers 5a-k and 7a-e in good yields and purity. These ethers are important as precursors to the 2H-1-benzopyrans 8a-l and 9a-e.
The synthesis and potassium channel blocking activity of some (4-methanesulfonamidophenoxy)propanolamines as potential class III antiarrhythmic agents
作者:Sean P. Connors、Paul D. Dennis、Edward W. Gill、Derek A. Terrar
DOI:10.1021/jm00109a007
日期:1991.5
potassium channel blockingactivity. Compounds 81 and 8m produced a significant increase in APD at nanomolar concentrations, with no effect on cardiac muscle conduction velocity, and hence merit further investigation as Class III antiarrhythmic agents. Methylation of the methanesulfonamido group abolished channel-blocking activity; 4-carboxy and 3-methanesulfonamido analogues retained activity but at a reduced