01367nas a2200193   4500008004100000022001400041245011300055210006900168260007100237300001400308490000700322520062500329100001700954700002400971700001500995700001701010700002001027856012601047       2016                        eng d  a0022-326300aIntramolecular dehydrogenative coupling of 2,3-diaryl acrylic compounds: access to substituted phenanthrenes0 aIntramolecular dehydrogenative coupling of 23diaryl acrylic comp  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUL  a5663-56690 v813 a<p>A simple, facile, and environmentally benign intramolecular dehydrogenative coupling of various 1,2-diarylethylenes for the synthesis of phenanthrenes in excellent yield has been described. This new methodology uses ceric ammonium nitrate (CAN) as a promoter at room temperature and has been extended to intermolecular synthesis of biaryl compounds. The electron transfer from methoxyarene to cerium leads to cationic radical formation, which further proceeds to intramolecular coupling. Preliminary mechanistic investigation by EPR spectroscopy and density functional theory calculation suggested a similar view.</p>1 aGupta, Vijay1 aRao, V., U. Bhaskar1 aDas, Tamal1 aVanka, Kumar1 aSingh, Ravi, P.  uhttps://library.ncl.res.in/content/intramolecular-dehydrogenative-coupling-23-diaryl-acrylic-compounds-access-substituted01113nas a2200193   4500008004100000022001400041245012400055210006900179260000800248300001400256490000700270520042200277100001700699700002000716700001800736700001700754700002000771856012800791       2019                        eng d  a1477-052000aDiastereoselective multi-component tandem condensation: synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles0 aDiastereoselective multicomponent tandem condensation synthesis   cOCT  a8853-88570 v173 a<p>A general strategy for a one-pot stereoselective synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles by reaction of salicylaldehyde, malononitrile and butenolides via a tandem Knoevenagel/Pinner/vinylogous Michael condensation is presented. The beta,gamma-butenolides gave a syn-selective MCR adduct with a dr up to 11.5 : 1. The mechanistic insight into the MCR was obtained by DFT calculations.</p>
1 aGupta, Vijay1 aSahu, Debashish1 aJain, Shailja1 aVanka, Kumar1 aSingh, Ravi, P.  uhttps://library.ncl.res.in/content/diastereoselective-multi-component-tandem-condensation-synthesis-2-amino-4-2-furanone-4h