选择性远程DEPT^(13)C NMR新技术用于新阔叶千里光碱氮氧化合物的结构测定和谱峰归属研究

STRUCTURE DETERMINATION AND SPECTRAL ASSINGMENT OF A NEW ALKALOID NEUPLATY-PHYLLINE N-OXIDE BY SELECTIVE LONGRANGE DEPT ^(13)C NMR NEW TECHNIQUE

从湖北蟹甲草根茎中分得一个新的生物碱,选择性远程DEPT^(13)C NMR新技术用于识别NMR信号归属和连接被季碳及杂原子分割的质子自旋系统,确定其结构为新阔叶千里光碱的氮氧化物,如(1)所示。

A new alkaloid, neuplatyphyllinc N-oxide, was isolated from the root of Caculia hupehensis Hand-Mazzi. Selective long-range DEPT 13C NMR new technique has been sucessfully used to identify 13C nuclei and to connect the spin system separated by quaternary carbons and heteroatoms in the compound. Total assignment of 1H and 13C NMR spectra of the compound were achieved. Its structure has been elucidated as (1).