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13C NMR assignments of brassinosteroids by two-dimensional techniques

✍ Scribed by Tetsu Ando; Masakazu Aburatani; Nozomu Koseki; Seiichi Asakawa; Takehito Mouri; Hiroshi Abe

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 481 KB
Volume: 31
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260310119

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

^1^H NMR spectra of eight naturally occurring brassinosteroids, plant hormones with a steroid skeleton, and five synthetic analogues were analysed by COSY and long‐range COSY measurements. Based on the ^1^H resonances, the ^13^C signals were assigned by a combination of CH COSY and long‐range CH COSY spectra detecting ^13^C nuclei, or by HMQC and HMBC spectra detecting ^1^H nuclei. Although the steroids showed complex ^1^H signals around 1–2 ppm, the resonances for the two angular methyl groups and the other methyl groups in the side‐chain could be assigned unambiguously and used as a reference point for the other assignments. Strong correlation peaks between the methyl protons and carbons connected with the protons through two or three bonds were observed in the long‐range CH COSY or the HMBC spectra. These spectra provide valuable information for assigning the ^13^C NMR resonances of this class of compounds.

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