Iron-catalyzed thioesterification of methylarenes with thiols in water
作者:Liang Wang、Jing Cao、Qun Chen、Ming-yang He
DOI:10.1016/j.tetlet.2014.10.155
日期:2014.12
An iron-catalyzed coupling reaction of methylarenes with thiols leading to thioesters has been developed. The reactions were carried out in water with tert-butyl hydroperoxide (TBHP) as the oxidant and polyoxyethanyl α-tocopheryl sebacate (PTS) as the surfactant. The reaction medium is compatible with a series of functional groups and can be reused.
Selective approach to thioesters and thioethers via sp<sup>3</sup> C–H activation of methylarenes
作者:J. Feng、G.-P. Lu、C. Cai
DOI:10.1039/c4ra09450f
日期:——
Novel CDC approaches for the synthesis of thioesters and thioethers was developed via sp3 C–H activation of methylarenes and subsequent functionalization.
新型CDC方法用于合成硫酯和硫醚,通过对甲基芳烃进行sp3 C-H活化和随后的官能化。
Synthesis of Phosphorodithioate DNA via Sulfur-Linked, Base-Labile Protecting Groups<sup>1</sup>
作者:William T. Wiesler、Marvin H. Caruthers
DOI:10.1021/jo960274y
日期:1996.1.1
deoxynucleoside thiophosphite. Subsequent steps involved oxidation with sulfur to generate the completely protected phosphorodithioate triester, acylation of unreacted deoxynucleoside, and removal of the 5'-protecting group. Yields per cycle were usually 97-98% with 2-5% phosphorothioate contamination as determined by (31)P NMR. By using deoxynucleoside 3'-phosphorothioamidites and deoxynucleoside 3'-phosphoroamidites
Chemically synthesized small interfering RNAs (siRNAs) have been widely used to identify gene function and hold great potential in providing a new class of therapeutics. Chemical modifications are desired for therapeutic applications to improve siRNA efficacy. Appropriately protected ribonucleoside-3'-yl S-[beta-(benzoylmercapto)-ethyl]pyrrolidino-thiophosphoramidite monomers were prepared for the synthesis of siRNA containing phosphorodithioate (PS2) substitutions in which the two non-bridging oxygen atoms are replaced by sulfur atoms. A series of siRNAs containing PS2 substitutions have been strategically designed, synthesized, and evaluated for their gene silencing activities. These PS2-siRNA duplexes exhibit an A-form helical structure similar to unmodified siRNA. The effect of PS2 substitutions on gene silencing activity is position-dependent, with certain PS2-siRNAs showing activity significantly higher than that of unmodified siRNA. The relative gene silencing activities of siRNAs containing either PS2 or phosphoromonothioate (PS) linkages at identical positions are variable and depend on the sites of modification. 5'-Phosphorylation of PS2-siRNAs has little or no effect on gene silencing activity. Incorporation of PS2 substitutions into siRNA duplexes increases their serum stability. These results offer preliminary evidence of the potential value of PS2-modified siRNAs.
Alagui, A.; Apparu, M.; Pasqualini, R., Bulletin de la Societe Chimique de France, 1991, p. 286 - 295