Selective Cross-Couplings. Sequential Stille−Liebeskind/Srogl Reactions of 3-Chloro-4-arylthiocyclobutene-1,2-dione
摘要:
The synthesis and initial reactivity studies of 2 are described. It was found that it participates in Stille couplings exclusively at the C-Cl site with a number of organostannanes (58-71% yield) in the absence of Cu(I). Then, these new derivatives were functionalized at the C-S site with boronic acids by switching to the Liebeskind-Srogi reaction conditions (in the presence of a Cu(l) carboxylate) to yield the bifunctionalized cyclobutenediones (44-90% yield).
[EN] NOVEL OXADIAZOLE COMPOUNDS FOR CONTROLLING OR PREVENTING PHYTOPATHOGENIC FUNGI [FR] NOUVEAUX COMPOSÉS D'OXADIAZOLE POUR LA LUTTE OU LA PRÉVENTION CONTRE DES CHAMPIGNONS PHYTOPATHOGÈNES
[EN] NOVEL OXADIAZOLE COMPOUNDS FOR CONTROLLING OR PREVENTING PHYTOPATHOGENIC FUNGI<br/>[FR] NOUVEAUX COMPOSÉS D'OXADIAZOLE POUR LA LUTTE OU LA PRÉVENTION CONTRE DES CHAMPIGNONS PHYTOPATHOGÈNES
申请人:PI INDUSTRIES LTD
公开号:WO2020208509A1
公开(公告)日:2020-10-15
The present invention discloses a compound of formula (I), wherein, R1, L1,A, k, L2, W, L4, R5, R8 and R9 are as defined in the detailed description. The present invention further discloses a process for preparing the compound of formula (I).
A series of novel 3,4-diaryl squaric acid analogs 4a-r related to combretastatin A-4 (CA4) using squaric acid as the cis-restricted linker were prepared and studied for their anticancer activity against selected human cancer cell lines. New compounds 4g, 4k, 4m, 4n, 4p, 4q and 4r exhibit strong activities against human leukemia cells with IC50 values of <= 20 nM and compounds 4k, 4n, 4p, 4q and 4r showed potent activities against a panel of human tumor cell lines. Compounds 4n and 4p arrest tumor cell cycle in G2-M phase. Computational modeling analysis suggests that the binding mechanism of compound 4n to the colchicine binding site on the microtubules is similar to that of CA4. (C) 2013 Elsevier Masson SAS. All rights reserved.
Selective Cross-Couplings. Sequential Stille−Liebeskind/Srogl Reactions of 3-Chloro-4-arylthiocyclobutene-1,2-dione
作者:Angélica Aguilar-Aguilar、Eduardo Peña-Cabrera
DOI:10.1021/ol701628z
日期:2007.10.1
The synthesis and initial reactivity studies of 2 are described. It was found that it participates in Stille couplings exclusively at the C-Cl site with a number of organostannanes (58-71% yield) in the absence of Cu(I). Then, these new derivatives were functionalized at the C-S site with boronic acids by switching to the Liebeskind-Srogi reaction conditions (in the presence of a Cu(l) carboxylate) to yield the bifunctionalized cyclobutenediones (44-90% yield).