{"title":"DABCO 在水介质中催化合成呫吨衍生物。","authors":"Pradeep Paliwal, Srinivasa Rao Jetti, Anjna Bhatewara, Tanuja Kadre, Shubha Jain","doi":"10.1155/2013/526173","DOIUrl":null,"url":null,"abstract":"<p><p>The reaction of 5,5-dimethylcyclohexane-1,3-dione with various heteroarylaldehydes afforded the corresponding heteroaryl substituted xanthene derivatives 1(a-f). The reaction proceeds via the initial Knoevenagel, subsequent Michael, and final heterocyclization reactions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst in aqueous media. The synthesized heteroaryl substituted xanthenes 1(a-f) reacted with malononitrile to obtain different alkylidenes 2(a-f). Short reaction time, environmentally friendly procedure, avoiding of cumbersome apparatus, and excellent yields are the main advantages of this procedure which makes it more economic than the other conventional methods. </p>","PeriodicalId":14730,"journal":{"name":"ISRN Organic Chemistry","volume":"2013 ","pages":"526173"},"PeriodicalIF":0.0000,"publicationDate":"2013-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3767241/pdf/","citationCount":"0","resultStr":"{\"title\":\"DABCO Catalyzed Synthesis of Xanthene Derivatives in Aqueous Media.\",\"authors\":\"Pradeep Paliwal, Srinivasa Rao Jetti, Anjna Bhatewara, Tanuja Kadre, Shubha Jain\",\"doi\":\"10.1155/2013/526173\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The reaction of 5,5-dimethylcyclohexane-1,3-dione with various heteroarylaldehydes afforded the corresponding heteroaryl substituted xanthene derivatives 1(a-f). The reaction proceeds via the initial Knoevenagel, subsequent Michael, and final heterocyclization reactions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst in aqueous media. The synthesized heteroaryl substituted xanthenes 1(a-f) reacted with malononitrile to obtain different alkylidenes 2(a-f). Short reaction time, environmentally friendly procedure, avoiding of cumbersome apparatus, and excellent yields are the main advantages of this procedure which makes it more economic than the other conventional methods. </p>\",\"PeriodicalId\":14730,\"journal\":{\"name\":\"ISRN Organic Chemistry\",\"volume\":\"2013 \",\"pages\":\"526173\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-03-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3767241/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ISRN Organic Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1155/2013/526173\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2013/1/1 0:00:00\",\"PubModel\":\"eCollection\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ISRN Organic Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1155/2013/526173","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2013/1/1 0:00:00","PubModel":"eCollection","JCR":"","JCRName":"","Score":null,"Total":0}
DABCO Catalyzed Synthesis of Xanthene Derivatives in Aqueous Media.
The reaction of 5,5-dimethylcyclohexane-1,3-dione with various heteroarylaldehydes afforded the corresponding heteroaryl substituted xanthene derivatives 1(a-f). The reaction proceeds via the initial Knoevenagel, subsequent Michael, and final heterocyclization reactions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst in aqueous media. The synthesized heteroaryl substituted xanthenes 1(a-f) reacted with malononitrile to obtain different alkylidenes 2(a-f). Short reaction time, environmentally friendly procedure, avoiding of cumbersome apparatus, and excellent yields are the main advantages of this procedure which makes it more economic than the other conventional methods.
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