Manganese-Catalyzed Divergent Markovnikov Addition and [2+2+2] Cycloaddition of 2-Carbonyl Indanone with Terminal Alkyne
作者:Pradip Ramdas Thorve、Murali Mohan Guru、Biplab Maji
DOI:10.1021/acs.joc.9b01173
日期:2019.6.21
addition and [2+2+2] cycloaddition of 2-carbonyl indanones with terminal alkynes. This method provides an efficient approach for the construction of all-carbon quaternary centers and complex polycyclichydrocarbon frameworks by the formation of new carbon–carbon single bonds in a regio- and stereoselective manner. Preliminary mechanistic experiments involving deuterium labeling, kinetic, catalytic, and
Novel Tartrate-Based Guanidines for Enantioselective Fluorination of 1,3-Dicarbonyl and α-Cyano Carbonyl Compounds
作者:Liwei Zou、Xiaoze Bao、Huanrui Zhang、Yuming Song、Jingping Qu、Baomin Wang
DOI:10.1071/ch14179
日期:——
electronic properties. A guanidine molecule of this library with an incorporated 2,6-diisoaniline fragment was identified as a suitable promoter for the enantioselective fluorination of 1,3-dicarbonyl and α-cyano carbonyl compounds to furnish the fluorinated product with up to 84 % ee and 99 % yield using N-fluorobenzenesulfonimide (NFSI) as the fluorinating agent.
A novel library of chiral guanidines featuring a tartaric acid skeleton was developed from diethyl L-tartrate. These guanidines are easily accessed with tunable style and electronic properties. The utilities of the guanidines were highlighted by their ability to catalyze the alpha-hydroxylation of beta-ketoesters and beta-diketones with remarkable efficiency and excellent enantioselectivity.