The invention provides a use of a morpholino subunit of the formula (I)
where P is a purine or pyrimidine base-pairing moiety, and T is H or an N-protective group, for the production of a polymer capable of hydrogen-bonding to complementary bases in a polynucleotide, where in said polymer (i) the subunits are joined predominantly by substantially uncharged, achiral linkages, and (ii) each linkage joins the morpholino nitrogen of one subunit to the 5' exocyclic carbon of an adjacent subunit.
本发明提供了式 (I) 吗啉亚基的用途
其中 P 是嘌呤或嘧啶碱基配对分子,T 是 H 或 N 保护基团,用于生产能够与多核苷酸中的互补碱基发生氢键连接的聚合物,在所述聚合物中,(i) 亚基主要通过基本上不带电的非手性连接物连接,(ii) 每个连接物将一个亚基的吗啉基氮连接到相邻亚基的 5'外环碳上。
Efficient synthesis of 2′-deoxyzebularine and its α-anomer by the silyl method of N-glycosylation. Crystal structures and conformational study in solution
2'-Deoxyzebularine and its alpha-anomer have been efficiently synthesized with relatively high stereoselectivity by a modified procedure of the silyl method of the N-glycosidic bond formation. An SnCl4-catalyzed condensation of silylated pyrimidin-2-one with 1-alpha-chloro-3,5-di-O-p-toluoy1-2-deoxy-D-ribofuranose under kinetic control condition (-33 degrees C, 1,2-dichloroethane) led to the mixture of beta- and alpha-anomeric nucleosides in 3:1 ratio. Analogous condensation at +35 degrees C (thermodynamic control conditions) provided mainly p-toluoyl protected alpha-2'-deoxyzebularine (alpha:beta= 4:1), easily separated by crystallization from the anomeric mixture. The structures of both 2'-deoxyzebularine anomers were confirmed by X-ray analysis of the crystals and conformational studies in solution performed using an NMR method. (C) 2014 Elsevier Ltd. All rights reserved.
SEELA, FRANK;BINDIG, UWE, LIEBIGS ANN. CHEM.,(1989) N, C. 895-901