Catalytic reductive desymmetrization of malonic esters
作者:Pengwei Xu、Zhongxing Huang
DOI:10.1038/s41557-021-00715-0
日期:2021.7
carbons with a pair of enantiotopic functional groups is a practical strategy for the synthesis of quaternary stereocentres, as it divides the tasks of enantioselection and C−C bond formation. The use of disubstituted malonic esters as the substrate of desymmetrization is particularly attractive, given their easy and modular preparation, as well as the high synthetic values of the chiral monoester products
Substituent effects on partition coefficients of barbituric acids
作者:Ooi Wong、Robert Henry McKeown
DOI:10.1002/jps.2600771105
日期:1988.11
Precise partitioncoefficients in 1-octanol-water at 25 degrees C were determined for three 2-thiobarbituric acids and 14 barbituricacids with a wider range of substituents. The experimental log P values (log Pexp) of barbituricacids were correlated with the carbon number and the branching effect of the C5 substituent(s) by linear regression analysis. The carbon number term makes a major contribution
malonic esters is a rewarding strategy to access structurally diverse quaternary stereocenters. Particularly, asymmetric reduction of malonic esters would generate a functional group with a lower oxidation state than the remaining ester, thus allowing for more chemoselective derivatization. Here, we report a new set of conditions for the zinc-catalyzed desymmetric hydrosilylation of malonic esters that