Environmentally benign decarboxylative <i>N</i>-, <i>O</i>-, and <i>S</i>-acetylations and acylations
作者:Santanu Ghosh、Anisha Purkait、Chandan K. Jana
DOI:10.1039/d0gc03731a
日期:——
An operationally simple and general method for acetylation and acylation of a wide variety of substrates (amines, alcohols, phenols, thiols, and hydrazones) has been reported. Meldrum's acid and its derivatives have been used as an air-stable, non-volatile, cost-effective, and easy to handle acetylating/acylating agent. Easily separable byproducts (CO2 and acetone) allowed the isolation of analytically
Facile Synthesis of Novel Pyrimido[1,2-<i>a</i>]pyrimidin-4-ones from Highly Reactive Malonates
作者:Mustafa Güllü、Ali Dinçsönmez、Öznur Özyavaş
DOI:10.1002/ejoc.200901419
日期:2010.4
A very simple and efficient procedure for the synthesis of novel 2-hydroxy-4H-pyrimido(1,2-a]pyrimidin-4-ones is described. Title compounds were obtained from the room temperature reaction of 2-aminopyrimidine and its substituted derivatives with bis(2,4,6-trichlorophenyl) malonates. High product yields were observed under optimized conditions. Applicability and reactivity of a range of substituted
concerted fragmentation is proposed. An enantioselective one-pot Michaeladdition/Conia-ene reaction sequence catalyzed by the combination of a squaramide and indium(III) triflate has been developed. Employing 2-ethynyl-β-nitrostyrenes and 1,3-dicarbonyl compounds as substrates, the functionalized methyleneindanes and methylindenes are obtained in good to excellent enantiomeric excesses. For the indane/indene
It′s just a phase: The title reaction sequence of para‐quinonemethides (p‐QMs) has been developed with malonates under phase‐transfer catalysis. The reaction also offers an alternative route to asymmetric construction of diarylmethine stereocenters in excellent enantioselectivities and high yields.
The present invention relates to functional fluid compositions containing friction modifiers, and specifically stable compositions containing friction modifiers with limited solubility in and/or limited compatibility with the functional fluids with which they are used. In particular the present invention deals with functional fluids used in internal combustion engines, such as engine oils, and friction modifiers derived from hydroxy-carboxylic acids, where the friction modifier is present in the functional fluid composition at levels that would otherwise cause the composition to be unstable and/or hazy.