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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Thioureadioxide:Anefficientandreusableorganocatalystfortherapidone-potsynthesisofpyrano[4,3-b]pyranderivativesinwater
DOI: 10.1016/S1872-2067(12)60727-X, PP. 127-133
Keywords: Pyrano[4,3-b]pyran,Thioureadioxide,4-Hydroxy-6-methylpyran-2-one,One-potsynthesis
Abstract:
？Aseriesofpyrano[4,3-b]pyranderivativeshavebeensynthesizedinexcellentyieldsbythereactionofaromaticaldehydeswithmalononitrileorcyanoacetateand4-hydroxy-6-methylpyran-2-oneinwaterat80℃,withthetransformationbeingcatalyzedbyanaqueoussolutionofthioureadioxide(TUD).Uponcompletionofthereaction,theproductwasisolatedbyfiltrationorextractionandtheremainingaqueousTUDsolutioncouldbereusedseveraltimeswithoutanydiscernibleimpactonitscatalyticactivity.Thisprocedureoffersseveraladvantagesoverexistingprocedures,includinghighyields,operationalsimplicity,theuseofanon-toxiccatalystandsolvent,shortreactiontimeandminimumpollutionoftheenvironment,makingitausefulandattractiveprocessforthepreparationofpyrano[4,3-b]pyranderivatives.
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