01752nas a2200265   4500008004100000022001400041245016300055210006900218260007300287300001200360490000700372520077300379653001401152653002301166653002101189653001301210653001701223653001501240653001401255100001901269700002301288700002501311700002301336856012701359       2008                        eng d  a1350-417700aEfficient synthesis of 1,8-dioxo-octahydro-xanthene derivatives promoted by a room temperature ionic liquid at ambient conditions under ultrasound irradiation0 aEfficient synthesis of 18dioxooctahydroxanthene derivatives prom  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a548-5530 v153 a<p>The condensation reaction involving an aldehyde and diketone was efficiently promoted by the Ionic liquid, [Hbim]BF(4) (IL) as a reaction medium with methanol as co-solvent at ambient temperature under ultrasonic irradiation to afford the corresponding 1,8-dioxo-octahydroxantliene (xanthene) derivatives in excellent yields. The advantages of this method include among others the use of a recyclable, non-volatile ionic liquid, which promotes this protocol under ambient temperature without the requirement of ally added catalyst. The reaction times and yields are compared with p-TSA catalyzed synthesis of xanthenes under thermal conditions, which is also reported for the first time under our reaction conditions. (c) 2007 Elsevier B.V. All rights reserved.</p>10aaldehydes10aambient conditions10aBronsted acidity10adimedone10aIonic liquid10aUltrasound10aXanthenes1 aVenkatesan, K.1 aPujari, Suresh, S.1 aLahoti, Rajgopal, J.1 aSrinivasan, K., V.  uhttps://library.ncl.res.in/content/efficient-synthesis-18-dioxo-octahydro-xanthene-derivatives-promoted-room-temperature-001213nas a2200229   4500008004100000022001400041245011100055210006900166260008600235300001800321490000700339520036100346653000600707653003000713653001800743653001600761653001200777100001900789700002300808700002600831856012600857       2009                        eng d  a0039-791100aProline-catalyzed simple and efficient synthesis of 1,8-dioxo-decahydroacridines in aqueous ethanol medium0 aProlinecatalyzed simple and efficient synthesis of 18dioxodecahy  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcDEC  aPII 9071279190 v393 a<p>Proline-catalyzed synthesis of 1,8-dioxo-decahydroacridines is achieved via one-pot, three-component condensation of aromatic aldehydes, cyclic diketone, and aryl amines in aqueous ethanol medium. This method offers the advantages of proceeding in neutral and mild conditions, giving high to excellent yields of acridines with easy workup procedure.</p>10a110a8-dioxodecahydroacridines10aaqueous media10aone-pot MCR10aProline1 aVenkatesan, K.1 aPujari, Suresh, S.1 aSrinivasan, Kumar, V.  uhttps://library.ncl.res.in/content/proline-catalyzed-simple-and-efficient-synthesis-18-dioxo-decahydroacridines-aqueous-0