摘要
天然有机小分子因结构的多样性和复杂性,其立体结构的鉴定一直是研究的难点,也是热点之一。尤其是近年来分离材料的发展,得到的天然产物的结构更趋复杂,且得量少,这给其立体结构的解析带来了更严峻的挑战。随着计算方法的发展和计算技术的进步,利用不同的理论方法来鉴定不同类型的手性分子的立体结构成为可能。主要是通过计算有机分子的13C NMR并与实验结果比较来确定未知结构分子的相对构型,其在分子中的任何一个手性中心绝对构型已知的前提下,计算13C NMR也可用于绝对构型的鉴定。另外,通过计算手性分子的旋光(OR),旋光色散(ORD)、电子圆二色谱(ECD)、振动圆二色谱(VCD)以及手性分子的特征矩阵值,并将这些计算结果与实验值进行比较,也能很好地确定手性分子的绝对构型。目前,利用不同的计算方法来交叉验证同一分子的不同性质,成为一种非常有效的研究模式。
Identification of natural products has been a big challenge because of their structural complexity and diversity.Recently,with the development of separation materials,more and more complex compounds have been found with small quantity,which causes difficulty in absolute configuration assignment. Now,the computational methods,such as to compute the 13 C NMR data and compare them with experimental results,could be used for relative configuration study;other methods,for example,to compute optical rotation(OR),or optical rotatory dispersion(ORD),electronic circular dichroism(ECD or CD) or vibrational circular dichroism(VCD),could be efficiently used for absolute configuration determinations for chiral compounds,including the derminant computations for chiral acyclic compounds. Now,two or two more methods are applied for the absolute configuration study and exhibit very powerful reliability.
出处
《国际药学研究杂志》
CAS
CSCD
北大核心
2015年第6期669-685,共17页
Journal of International Pharmaceutical Research
关键词
碳谱
电子圆二色谱
振动圆二色谱
旋光
矩阵
carbon spectra
electronic circular dichroism
vibrational circular dichroism
optical rotation
matrix