Enantioselective and Regioselective Friedel-Crafts Alkylation of Pyrroles with Nitroalkenes Catalyzed by a Tridentate Schiff Base-Copper Complex
作者:Fengfeng Guo、Dalu Chang、Guoyin Lai、Tao Zhu、Shunshun Xiong、Sujing Wang、Zhiyong Wang
DOI:10.1002/chem.201102206
日期:2011.9.26
On a (pyr)role: A mild and highly efficientcatalytic system has been developed for the asymmetric Friedel–Crafts alkylation of pyrroles with nitroalkenes (see scheme). High yields, and excellent enantioselectivities and regioselectivities were obtained for a broad range of substrates. The synthetic utility of this methodology and mechanisticstudies involving a novel, negative, nonlinear effect are
Boosting Chemical Stability, Catalytic Activity, and Enantioselectivity of Metal–Organic Frameworks for Batch and Flow Reactions
作者:Xu Chen、Hong Jiang、Bang Hou、Wei Gong、Yan Liu、Yong Cui
DOI:10.1021/jacs.7b06459
日期:2017.9.27
5-bis(trifluoromethyl)-, bismethyl-, and bisfluoro-phenyl substituents at the 3,3'-position. For the first time, we show that not only chemical stability but also catalyticactivity and stereoselectivity of the MOFs can be tuned by modifying the ligand structures. Particularly, the MOF incorporated with -CF3 groups on the pore walls exhibits enhanced tolerance to water, weak acid, and base compared with the MOFs with
Direct Transformation of Primary Nitro Compounds into Nitriles with Sodium Dithionite
作者:Baris Temelli、Canan Unaleroglu
DOI:10.1055/s-0033-1370874
日期:——
Abstract A new and practical directtransformation of primarynitrocompounds into nitriles with sodium dithionite is described. The reaction is simple, convenient and eliminates the use of expensive and moisture-sensitive reagents. A new and practical directtransformation of primarynitrocompounds into nitriles with sodium dithionite is described. The reaction is simple, convenient and eliminates