Synthesis of spiro ɛ,ζ-D-CNA in xylo configuration featuring noncanonical δ/ɛ/ζ torsion angle combination
作者:Christelle Dupouy、Pierre Lavedan、Jean-Marc Escudier
DOI:10.1016/j.tet.2007.08.098
日期:2007.11
The synthesis of diastereoisomers of spiro xylo-ɛ,ζ-D-CNA dinucleotide building units of nucleic acids, in which the ɛ and ζ torsional angles are stereocontrolled by a dioxaphosphorinane ring structure (D-CNA family), is described from uridine with a Mukaïyama's aldol condensation as key reaction. The NMR structure analysis showed that δ, ɛ and ζ torsional angles of the (SC3′,RP)- and (SC3′,SP)-configured
从尿嘧啶核苷中描述了螺旋木糖基的非对映异构体的合成,其中ζ和ζ扭转角由二氧杂磷环烷环结构(D-CNA家族)立体控制。 Mukaïyama的醛醇缩合反应是关键反应。的NMR结构分析结果表明,δ,ɛ和ζ扭转(的角度小号C3' ,- [R P) -和(小号C3' ,小号P)构型的木糖-ɛ,ζ-d-CNA TT二聚体被限制在δ,ɛ,ζ} = 顺,反,gauche } +或顺,反,gauche(-)}构象分别与A型或B型双链体中通常观察到的构象显着不同。