微环境敏感的荧光(ESF)核苷是用于核酸研究的强大工具。合成了新的5-取代的尿苷类似物,其包含通过5-硫代酰胺-尿苷与芳族α-溴羰基化合物的汉茨(Hantzsch)合成反应获得的4 H-环戊[ d ]噻唑环。新化合物的最大发射量在可见光区域。它们具有很强的溶剂和pH依赖性荧光特性,表明它们有望成为荧光探针。
Palladium-catalyzed cyclotrimerization was applied to three strainedcycloalkynes. Pd(PPh 3 ) 4 and Pt(PPh 3 ) 4 -catalyzed cyclotrimerizations of cyclohexyne (2) afforded dodecahydrotriphenylene (3) in 64% and 62% yields, respectively, but subjecting cyclopentyne to the same conditions failed to afford isolable amounts of the cyclotrimer. Finally, decacyclene (15), a putative C 6 0 -fullerene precursor