Diastereoselective Synthesis of a Conformationally Restricted Dinucleotide with Predefined α and β Torsional Angles for the Construction of α,β-Constrained Nucleic Acids (α,β-CNA)
作者:Ingrid Le Clézio、Jean-Marc Escudier、Alain Vigroux
DOI:10.1021/ol027222h
日期:2003.1.1
[GRAPHICS]The synthesis of a diastereopure 1,3,2-dioxaphosphorinane linkage in which two, alpha and beta, out of six torsion angles of the natural phosphodiester backbone are constrained with predefined values of ca. +60degrees (g+) and 180degrees (t), respectively, is described. The stable and unstrained six-membered cyclic phosphotriester structure represents the smallest possible ring allowing the conformational locking of the alpha torsion angle at a significant positive value that is typical of many bulged regions of nucleic acids.