Concise Approach to Mono- and Disubstituted Luotonin A Analogs and Their Cytotoxicity Test
摘要:
A concise approach for the preparation of luotonin A analogs has been developed. The new synthetic route contains an anion-assisted intramolecular double hetero Diels-Alder reaction and a direct oxidative cross coupling reaction. Some synthetic luotonin A analogs show cytotoxic activities against Daudi and Jurkat human cancer cells as potent as camptothecin.
esters from phenols and alcohols and sulfonamides from amines was achieved in excellent yields. Majority of the phenols irrespective of their substituents electronic nature underwent tosylation nearly at same reactionrate with an average yield of 95%. For amines, ring activating substituents favors rapid sulfonylation while the ring deactivating substituents relatively lowers the rate of tosylation
Coupled up: A new general palladium‐catalyzed procedure for the cross‐coupling of aryl and heteroaryltosylates is described. This highly versatile and efficient process can be used for the synthesis of a wide variety of functionalized alkynes (see scheme).
Access to phthalazinones via palladium-catalyzed three-component cycloamino-carbonylation of 2-formylaryl tosylates, hydrazines and CO
作者:Bin Liu、Chunlei Zhang、Xigeng Zhou
DOI:10.1016/j.tet.2016.10.065
日期:2016.12
The palladium-catalyzed three-component cycloaminocarbonylation of 2-formylaryl tosylates with hydrazines and carbon monoxide has been established, which provides an efficient method for synthesis of substituted phthalazinones. In addition, by applying this protocol as the key step, Hydralazine can easily be synthesized in 65% yield.
A concise approach for the preparation of luotonin A analogs has been developed. The new synthetic route contains an anion-assisted intramolecular double hetero Diels-Alder reaction and a direct oxidative cross coupling reaction. Some synthetic luotonin A analogs show cytotoxic activities against Daudi and Jurkat human cancer cells as potent as camptothecin.
A concise approach to the preparation of 2-hydroxydiarylketones by an intramolecular acyl radical ipso substitution
作者:William B Motherwell、Santiago Vázquez
DOI:10.1016/s0040-4039(00)01746-9
日期:2000.12
Substituted 2-hydroxydiarylketones have been simply prepared using an intramolecular acyl radical [1,6] ipsosubstitution reaction.