Synthesis and Preliminary Biological Characterization of New Semisynthetic Derivatives of Ramoplanin
作者:Romeo Ciabatti、Sonia I. Maffioli、Gianbattista Panzone、Augusto Canavesi、Elena Michelucci、Paolo S. Tiseni、Ettore Marzorati、Anna Checchia、Matteo Giannone、Daniela Jabes、Gabriella Romanò、Cristina Brunati、Gianpaolo Candiani、Franca Castiglione
DOI:10.1021/jm070042z
日期:2007.6.1
of the new ramoplanin derivatives showed antimicrobial activity similar to that of the natural precursor coupled with a significantly improved local tolerability. Among them the derivative in which the 2-methylphenylacetic acid has replaced the di-unsaturated fatty acid side chain (48) was selected as the most interesting compound and submitted to further in vitro and in vivo characterization studies
A highly enantio‐ and diastereoselective formal (4+3) cycloaddition of 1,3‐diene‐1‐carbamates with 3‐indolylmethanols in the presence of a chiral phosphoric acid catalyst is reported. The approach described herein provides efficient access to 6‐aminotetrahydrocyclohepta[b]indoles in good yields with mostly complete diastereoselectivity and excellent levels of enantioselectivity (>98:2 dr and up to
作者:Nagaraju Madala、Venkata Rao Ghanta、Srilalitha Vinnakota、Narender Mendu、Arun B. Ingle、Krishna Ethiraj、Vishal Sharma
DOI:10.1016/j.tetlet.2018.05.090
日期:2018.7
A synthetic strategy was developed for the synthesis of the common core structure of Carpatamides A–D. The total synthesis of Carpatamides A and C was completed in 6 steps and of Carpatamides B and D in 7 steps, by employing the Wittig olefination, olefin cross metathesis and acid amine coupling reactions as key steps.
Enantioselective and Diastereodivergent Synthesis of Spiroindolenines via Chiral Phosphoric Acid-Catalyzed Cycloaddition
作者:Thomas Varlet、Mateja Matišić、Elsa Van Elslande、Luc Neuville、Vincent Gandon、Géraldine Masson
DOI:10.1021/jacs.1c04648
日期:2021.8.4
A diastereodivergent and enantioselective synthesis of chiral spirocyclohexyl-indolenines with four contiguous stereogenic centers is achieved by a chiral phosphoric acid-catalyzed cycloaddition of 2-susbtituted 3-indolylmethanols with 1,3-dienecarbamates. Modular access to two different diastereoisomers with high enantioselectivities was obtained by careful choice of reaction conditions. Their functional
Process for the production of ramoplanin-like amide derivatives
申请人:Ciabatti Romeo
公开号:US20050106691A1
公开(公告)日:2005-05-19
The invention regards a process for the production of ramoplanin-like derivatives of formula (I): RAMO-NC—CO—R (I), wherein the radical R represents a hydrocarbon radical and the portion RAMO-NH— represents deacylated ramoplanin, any of its factors or ramoplanose. The compound of Formula (I) are obtained by reacting a carboxylic acid R—COOH with deacylated ramoplanin, any of its factors or ramoplanose protected on the ornitine amino groups. New compounds wherein the hydrocarbon radical R is different form those characaterizing the ramoplanin and ramoplanose natural products and their tetrahydro-derivatives are calimed. The new compounds have the same or better antinfective activity, lower haemolytic effect and better tolerability profile than ramoplanin.