A Convenient Entry to New C-7-Modified Colchicinoids through Azide Alkyne [3+2] Cycloaddition: Application of Ring-Contractive Rearrangements
摘要:
Reliable procedures for the preparation of azides derived from colchicine (1), allocolchicine (3) and N-acetylcolchinol (4a) were developed. These azides were then employed in Cu-catalyzed Huisgen-Sharpless [3+2] cycloaddition ("click") reactions with alkynes under microwave irradiation. The method developed opens a convenient and efficient access to libraries of new C-7-modified colchicinoids (triazole derivatives). In addition, a plausible mechanistic rationale for the colchicine-allocolchicine rearrangement is suggested.
Lipidic polyols using thiol‐ene/yne strategy for crosslinked polyurethanes
作者:Phuoc Dien Pham、Vincent Lapinte、Yann Raoul、Jean‐Jacques Robin
DOI:10.1002/pola.27159
日期:2014.6
converted into propargylic esters followed by thiol‐ene/yne coupling (TEC/TYC) functionalization in presence of mercaptoethanol. The multiradical addition on fatty esters leads to the formation of lipidicpolyols (OH1 and OH2), as judged by 1H NMR and mass spectroscopies as well as by size exclusion chromatography. The crosslinking reaction between TEC/TYC‐based polyols and 4,4′‐methylene bis(phenylisocyanate)
Amphiphilic bioconjugates obtained from xylan derivatives
申请人:Université de Bordeaux
公开号:EP3034517A1
公开(公告)日:2016-06-22
The present invention concerns a compound of formula (I):
wherein:
- n is an integer comprised between 1 and 7;
- X1 is in particular a radical of formula -CH2-S-(CH2)k-S-;
- A1 is in particular a linear or branched alkylene radical comprising from 2 to 30 carbon atoms, and
- X2 is in particular an alkoxy group of formula ORa, wherein Ra is a linear or branched alkyl group comprising from 1 to 10 carbon atoms.
Reliable procedures for the preparation of azides derived from colchicine (1), allocolchicine (3) and N-acetylcolchinol (4a) were developed. These azides were then employed in Cu-catalyzed Huisgen-Sharpless [3+2] cycloaddition ("click") reactions with alkynes under microwave irradiation. The method developed opens a convenient and efficient access to libraries of new C-7-modified colchicinoids (triazole derivatives). In addition, a plausible mechanistic rationale for the colchicine-allocolchicine rearrangement is suggested.
Synthesis and antitumor activity of 7-(triazol-1-yl)pyrroloallocolchicine derivatives
作者:N. S. Sitnikov、A. V. Sintsov、E. S. Shchegravina、A. Prokop、H. G. Schmalz、V. V. Fokin、A. Yu. Fedorov
DOI:10.1007/s11172-015-1018-z
日期:2015.6
The cycloaddition of acetylene derivatives of azido-substituted pyrroloallocolchicines afforded 7-(triazol-1-yl)pyrroloallocolchicines. The synthesized compounds exhibit considerable cytotoxicity and apoptosis-inducing activity against Nalm 6 human leukemia cells.