Novel hexacyclic camptothecin derivatives. Part 1: Synthesis and cytotoxicity of camptothecins with an A-ring fused 1,3-oxazine ring
作者:Sheng Wang、Yuyan Li、Yonghui Liu、Aijun Lu、Qidong You
DOI:10.1016/j.bmcl.2008.05.103
日期:2008.7
modified hexacyclic camptothecin derivatives containing a 1,3-oxazine ring were first designed and synthesized. All of the hexacyclic camptothecins were assayed for in vitro cytotoxicity against nine human cancer cell lines. Among these compounds, 9b and 9c showed most potent cytotoxicity against several cell lines. Particularly, 9c was about 13-fold more potent than camptothecin, and about sixfold
Synthesis and characterization of novel 7-hydroxycoumarin derivatives
作者:H. Mostafavi、R. Najjar、E. Maskani
DOI:10.1007/s10600-013-0628-7
日期:2013.7
The synthesis of several coumarin Mannich bases is described. The reaction of natural 7-hydroxycoumarin with primary amines and two equivalents of formaldehyde in the presence of a base catalyst was studied. Several novel N-substituted angular 9,10-dihydro-2H,8H-chromeno[8,7-e][1,3]oxazin-2-ones were synthesized. Different aliphatic and aromatic amines have been used in the reaction, and the corresponding products were obtained with moderate to relatively good yields.
Efficient photochemical production of hydrogen in aqueous solution by simply incorporating a water-insoluble hydrogenase mimic into a hydrogel
作者:Tianjun Yu、Yi Zeng、Jinping Chen、Xiaohui Zhang、Guoqiang Yang、Yi Li
DOI:10.1039/c4ta04914d
日期:——
A water-insoluble hydrogenase mimic has been successively applied to the photochemical production of hydrogen in aqueous solution with high efficiency and activity by simply incorporating the mimic into the PVP hydrogel.