1,3-Dibromo-5,5-dimethylhydantoin (DBH)/kaolin: An efficient reagent system for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes under solvent-free conditions
β Scribed by Shirini, Farhad; Khaligh, Nader Ghaffari; Imanzadeh, Gholam Hossein; Ghasem-Abadi, Parisa Ghods
- Book ID
- 118427961
- Publisher
- Chinese Electronic Periodical Services
- Year
- 2012
- Tongue
- English
- Weight
- 215 KB
- Volume
- 23
- Category
- Article
- ISSN
- 1001-8417
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## Abstract A novel procedure for the synthesis of 14βarylβ14__H__βdibenzo[__a__,__j__]xanthenes through oneβpot condensation of naphthalenβ2βol with arenecarbaldehydes in the presence of __N__βbromosuccinimide (NBS) as catalyst under solventβfree conditions is described.
## Abstract Efficient syntheses of 3,4-dihydropyrimidin-2-(1H)-ones and the corresponding thioxo derivatives using 1,3-dibromo-5,5-dimethylhydantoin (DBH) catalysis of a one-pot three-component Biginelli reaction of aldehydes, ethyl acetoacetate, and urea or thiourea under microwave irradiation are