A series of benzenesulfonamide derivatives were synthesized and evaluated for their anti-proliferative activity and interaction with tubulin. These new derivatives showed significant activities against cellular proliferative and tubulin polymerization. Compound BA-3b proved to be the most potent compound with IC50 value ranging from 0.007 to 0.036 μM against seven cancer cell lines, and three drug-resistant
3-triazoles with carboxylicesters followed by acid-mediated aromatization has been developed, affording a variety of 2,5-disubstituted oxazole derivatives in good to high yields under mild reaction conditions. The present transformation is proposed to involve the intermolecular carbonyl ylide formation between in situ generated α-imino rhodium carbene species and carboxylicesters, which undergoes
we developed a versatile method for [3+2] cycloaddition with diverse nitriles to yield substituted oxazoles. Our approach can be extended to bis-oxazoles, isotope-labeled oxazoles, drug diversification, as well as natural product and drug synthesis. Integration of photolysis with continuous-flow chemistry demonstrated applicability, scalability, and robustness for oxazole synthesis.
A novel and direct synthesis of 2-alkyl-5-aryl disubstituted oxazoles
作者:Jong Chan Lee、Taiyoung Hong
DOI:10.1016/s0040-4039(97)10362-8
日期:1997.12
A direct and efficient method for the preparation of 2-alkyl-5-aryl disubstituted oxazoles was realized by reaction of aromatic alpha-methyl ketones with various aliphatic nitriles in the presence of Tl(OTf)(3). (C) 1997 Elsevier Science Ltd.