Poly(3,4‐dimethyl‐5‐vinylthiazolium) was synthesized from 3,4‐dimethyl‐5‐vinylthiazole through free radical polymerization and was examined as polymer precatalysts in the presence of 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) for the thioesterification of aldehydes with thiols. The poly(5‐vinylthiazolium)/DBU had excellent catalytic activity and could be reused 10 times without a considerable loss of
Solid phase synthesis and purification of 5′-mercaptoalkylated oligonucleotides
作者:P. Kumar、D. Bhatia、R.C. Rastogi、K.C. Gupta
DOI:10.1016/0960-894x(96)00084-4
日期:1996.3
A novel strategy for the synthesis of thiol link phosphoramidites having base labile S-acyl type protecting groups is described. The method involves the reaction of 6-bromohexanol with potassium thioacetate or thiobenzoate in the presence of 18-crown-6 as a phase transfer catalyst to obtain the compounds 3(a,b) which were then converted to their corresponding phosphoramidites 4(a,b) and used for solid phase synthesis of 5'-mercaptoalkylated oligonucleotides. The thiolated oligomers were purified by single step covalent chromatography using an activated sulfhydryl group containing support.