Nucleosides. Part LXIII. Acetals as new 2?-O-protecting functions for the synthesis of oligoribonucleotides: Synthesis of uridine building blocks and evaluation of their relative acid stability
A broad variety of new acyclic vinyl ethers (see 6–41) have been synthesized via the vinyl-interchange reaction of ethyl vinyl ether at room temperature using mercury(II) trifluoroacetate as a highly efficient catalyst. The appropriate vinyl ethers were reacted under acidic conditions with 3′,5′-O-silyl-protected uridine 42 to the corresponding 2′-O-(1-alkoxyethyl) derivatives 43–83 which gave, on
Es wird ein Verfahren zur Herstellung von Oligoribonucleotiden der Formel
worin n, L, BB, W, T, Y', U, C¹ und C² wie in der Beschreibung definiert sind, mittels Festphasensynthese beschrieben sowie Zwischenprodukte der Formeln
und
Azaoxa heterocyclic compound and method of preparing the same
申请人:——
公开号:US20040068084A1
公开(公告)日:2004-04-08
Disclosed is an azaoxa heterocyclic compound represented by the following formula (I):
1
(wherein, each symbol is defined the same as in the specification) and a method for preparing the same. This compound of the present invention is prepared by the reaction of a phenolic compound, an aromatic diamine compound and an aldehyde compound. The azaoxa heterocyclic compound of the present invention can be used as a hardening resin or a hardener for an epoxy resin, polyether and a resin containing active hydrogen atoms, wherein the composition formed by the azaoxa heterocyclic compound and the epoxy resin is useful in the application of laminates, adhesive, semiconductor packaging materials and phenolic resin forming materials.