Enantioselective Intermolecular Formal [3 + 3] Cycloaddition of 2,3-Disubstituted Indoles with Acrolein
摘要:
An expedient enantioselective synthesis of highly substituted hydrocarbazoles has been realized by an organocatalyzed formal [3 + 3] cycloaddition between acrolein and 2,3-disubstituted indoles. Tricyclic hydrocarbazoles were obtained from a broad range of 2,3-disubstituted indoles and acrolein in good to excellent yields and excellent enantioselectivites.
The present invention relates to a method for preparing a cyclic peptide with antiparasite activity and anticancer activity. The invention also relates to this peptide as an antiparasite agent, for example in the treatment of toxoplasmosis and as an anticancer agent. The invention also relates to the use of this cyclic peptide for treating organs ex vivo before transplantation.
terminal and non-terminal alkenes such as enol esters, alkenyl sulfides, enol ethers, silyl enol ethers, enamides and enecarbamates has been developed. The reactions are carried out at room temperature under air initiation in the presence of triethylborane acting as a chain transfer reagent and 4-tert-butylcatechol (TBC) as a source of hydrogen atom. The efficacy of the reaction is best explained by very
Flexible Synthesis and Evaluation of Diverse Anti-Apicomplexa Cyclic Peptides
作者:Mariam Traoré、Flore Mietton、Danièle Maubon、Marine Peuchmaur、Flaviane Francisco Hilário、Rossimiriam Pereira de Freitas、Alexandre Bougdour、Aurélie Curt、Marjorie Maynadier、Henri Vial、Hervé Pelloux、Mohamed-Ali Hakimi、Yung-Sing Wong
DOI:10.1021/jo4001492
日期:2013.4.19
A modular approach to synthesize anti-Apicomplexa parasite inhibitors was developed that takes advantage of a pluripotent cyclic tetrapeptide scaffold capable of adjusting appendage and skeletal diversities in only a few steps (one to three steps). The diversification processes make use of selective radical coupling reactions and involve a new example of a reductive carbon nitrogen cleavage reaction with SmI2. The resulting bioactive cyclic peptides have revealed new insights into structural factors that govern selectivity between Apicomplexa parasites such as Toxoplasma and Plasmodium and human cells.