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Citation: CUI Yong-Tao, WANG Jian-Qiang, YIN Jun, JI Chun-Xiang, GUO Cheng. Synthesis of 1,4-Dihydropyrimido[1,2-a] benzimidazole Derivatives via Microwave in Water[J]. Chinese Journal of Applied Chemistry, ;2010, 27(1): 53-57. shu

Synthesis of 1,4-Dihydropyrimido[1,2-a] benzimidazole Derivatives via Microwave in Water

1.
College of Sciences, Nanjing University of Technology, Nanjing 210009

Received Date: 15 January 2009
Available Online: 27 April 2009

A series of pyrimido[1,2-a] benzimidazoles derivatives were synthesized by the reaction of 2-aminobenzimidazole with an aldehyde in the presence of malononitrile under microwave irradiation or classical heating conditions in water without any catalyst.The results show the optimal conditions of the reaction are as follows: the molar ratio of three components(malononitrile/aldehyde/2-aminobenzimidazole) is 1.1 and the microwave irradiation time is 6~8 min with the power of 400 W.The total yield of 1,4-dihydropyrimido[1,2-a]benzimidazole was above 85%.The reaction rate was increased by 70 times against ordinary heating.Their optical characteristics were tested by fluorescence spectroscopy.Peaks ranging from 480 nm to 550 nm are observed in their fluorescence emission spectra.
- Microwave irradiation,
- dihydropyrimido[1,2-a]benzimidazole,
- water,
- fluorescence
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