Efficient microwave-assisted synthesis of new sulfonylbenzimidazole-4,7-diones: heterocyclic quinones with potential antitumor activity

Microwave‐assisted synthesis, metallation, and duff formylation of porphyrins

“…After cooling, the reaction mixture was applied as such onto silica column and eluted with chloroform: petroleum ether; b.p 60-90 C (1:3). The fast moving band was collected, and the solvent was evaporated to get Metalloporphyrin [4] 3,7,8,12,13,17,18). MS (m/z, %) 1118 (M þ , 100%), 57 (84%).…”

“…In the past few years, porphyrin chemistry under microwave heating has been under intense study with significant benefits. Microwave assisted reactions are believed to facilitate the polarization of the substrate thereby increasing the rate of the reactions [10][11][12]. Herein, we wish to report the use of inorganic polymer solid support for synthesis, metallation, and formylation of porphyrins.…”

Microwave-assisted synthesis of some 5(6)-nitro-1H-benzimidazoles and their hydrazide derivatives

“…A number of synthetic methods have been developed in recent years to bring out new reagents for the synthesis of 2-substitued benzimidazoles [5][6][7][8][9]. A major drawback of these methods is the poor yields, use of expensive reagents and long reaction time.…”

Benzoimidazole Derivatives Containing Indole Unit: Activated Carbon/Air Promoted Synthesis and Spectral Properties

“…鉴于此, 本文选用 3-吲哚甲醛为原料, 合成了具有拓展 π 结构的含吲哚基苯 并咪唑衍生物, 并测试其紫外-可见吸收光谱和荧光发 射光谱, 期待筛选和进一步合成有更佳性能的光敏材 料. 苯并咪唑衍生物可经多种途径合成, 其中主要有两 种: 第一种是以邻苯二胺与羧酸或其衍生物为原料, 在 盐酸 [18] 、多聚磷酸 [19] , 或微波辐射 [20,21] 等作用下合成, MnO 2 [24] 等, 催化剂有 Co(OH) 2 [25] 、苯磺酸 [26] 、Cu(II)配 合物 [27] 等. 然而, 这种方法也有一些不足之处, 如后处 理复杂、需化学计量甚至过量的氧化剂, 有些氧化剂或 催化剂本身毒性较大, 许多反应还产生毒性大或污染环 境的副产物等.…”