Synthesis and antitumor activity of 4-hydroxycoumarin derivatives
作者:Jae-Chul Jung、Ji-Ho Lee、Seikwan Oh、Jae-Gon Lee、Oee-Sook Park
DOI:10.1016/j.bmcl.2004.09.009
日期:2004.11
A series of 4-hydroxycoumarinderivatives was prepared and evaluated for antitumor activity. The key fragments were 2a-c, 5c, 12b, 13b, 17, and 18 which were prepared via dianion ring cyclization, Friedel-Crafts acylation, and Reformatsky reaction. Compound 20b showed the most potent antitumor activity among the total 12 derivatives and compounds 19a and 19b exhibited efficacy comparable to etoposide
Borontribromide-mediated C–C bond formation in cyclic ketones: a transition metal free approach
作者:Imran Ahmad、Vinay Pathak、Prema G. Vasudev、Hardesh K. Maurya、Atul Gupta
DOI:10.1039/c4ra01745e
日期:——
In this study, borontribromide mediated C–C bond formation reactions of tetralones, chromenone, thiochromenone and indanones were explored. A methoxy group containing ketones showed selective C–C bond formation reaction instead of demethylation of the methoxy group. MM2 steric energy calculations for the final products showed that the reaction favored the formation of exo- or endo-cyclic double bond