How do the gauche and anomeric effects drive the pseudorotational equilibrium of the pentofuranose moiety of nucleosides?
作者:Janez Plavec、Weimin Tong、Jyoti Chattopadhyaya
DOI:10.1021/ja00074a046
日期:1993.10
The conformational characteristics of abasic 1-deoxy sugars 1,2, and 3 and pentofuranose moieties in 2',3'- dideoxy-(ddA (6), ddG (7), ddC (S)), 2'-deoxy-(dA (9), dG (lo), dC (ll)), and ribo-@-D-nucleosides (Ade (12), Gua (13), Cyt (14)) were established through the analysis of vicinal proton-proton coupling constants extracted from their 500-MHz lH-NMR spectra recorded at 20 K intervals in the temperature
无碱基 1-脱氧糖 1,2 和 3 以及 2',3'-双脱氧-(ddA (6)、ddG (7)、ddC (S))、2'-脱氧-( dA (9)、dG (lo)、dC (ll)) 和 ribo-@-D-核苷(Ade (12)、Gua (13)、Cyt (14))是通过邻位质子-质子分析建立的从其 500-MHz 1H-NMR 谱中提取的耦合常数以 20 K 间隔记录,温度范围为 278 至 358 K,D2O 溶液。(S)-四氢糠醇 (l)、2-(S)-(羟甲基)-4-(R)-氘代四氢呋喃 (4) 和 2-(S)-(羟甲基)-3- 的两种新型氘代类似物(S)-氘代四氢呋喃 (5),已在其 'H-NMR 谱中明确指定了复杂的九自旋系统。(In(&/&)) 作为 1 / Tgave AH' 和 AS' 的函数的范特霍夫图 呋喃戊糖 1-3 中的假旋转平衡值和核苷 614 中的呋喃戊糖部分的值。将