THE APPLICATION OF
HMQC-TOCSY TO THE
PLANT GLYCOSIDES AND PLANT CYCLOPEPTIDES |
| |
Abstract: | HMQC-TOCSY experiment is a useful 2D NMR
technique for elucidating structures of organic molecules that possess independent spin
systems. From HMQC-TOCSY spectrum, we can obtain information of all the proton
connectivities in the F2 dimension and information of the carbon connectivity
in the F1 dimension for a given spin system, so the chemical shifts of both
proton and carbon can be simultaneously assigned. In this paper, two examples,
annosquamosin A, which is a cyclopeptide, and prostratoside A, which is a triterpenoidal
saponin, are given to demonstrate the application of this technique to the natural
products. |
| |
Keywords: | |
|
|