Highly Efficient Suzuki–Miyaura Coupling of Heterocyclic Substrates through Rational Reaction Design
作者:Christoph A. Fleckenstein、Herbert Plenio
DOI:10.1002/chem.200701877
日期:2008.5.9
the presence of 0.5 mol % of catalyst, and S-heterocyclic aryl chlorides and aryl- or 3-pyridylboronic acids required 0.01-0.05 mol % Pd catalyst for full conversion. The key to the high activity of the Pd-phosphine catalyst is the rationaldesign of the reaction parameters (i.e., the presence of water in the reaction mixture, good solubility of reactants and catalyst in n-butanol/water (3:1), and
Suzuki−Miyaura and Sonogashira Coupling of 6-Chloropurines and -Nucleosides in Water
作者:Jan Pschierer、Herbert Plenio
DOI:10.1021/ol9007475
日期:2009.6.18
A general protocol is reported for the efficient Suzuki-Miyaura and the copper-free Sonogashira coupling of unprotected 6-chloropurines and unprotected beta-D-ribofuranosyl-6-chloropurine in water or in water/n-butanol utilizing Na2PdCl4 and a disulfonated and highly water-soluble fluorenylphosphine (cataCXium F sulk).
Newly synthesized 6-substituted piperazine/phenyl-9-cyclopentyl containing purine nucleobase analogs act as potent anticancer agents and induce apoptosis <i>via</i> inhibiting Src in hepatocellular carcinoma cells
Newlysynthesized 6-substituted piperazine/phenyl-9-cyclopentyl-containing purine nucleobase analogs were tested for their in vitroanticanceractivity against humancancercells. Compounds 15, 17–24, 49, and 56 with IC50 values less than 10 μM were selected for further examination on an enlarged panel of liver cancercelllines. Experiments revealed that compound 19 utilizes its high cytotoxic potential