## Abstract Vitamin E is a family of chromanols that vary by the degree of methylation of the chroman ring as well as the nature of the hydrophobic side chain at C2 that serves to anchor these lipids in biological membranes. The tocopherols contain saturated side chains, whereas the tocotrienols co
1H and 13C NMR assignments of the antitumor macrolide bryostatin 1
β Scribed by Daniel E. Schaufelberger; Gwendolyn N. Chmurny; Mary P. Koleck
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 610 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
During a largeβscale isolation of bryostatin 1, NMR measurements indicated that parts of the published ^13^C and ^1^H NMR assignments had to be revised. These reassignments were based on extensive homonuclear and heteronuclear oneβ and twoβdimensional NMR techniques performed at 500 MHz. These independently obtained assignments are also in good agreement with the revised assignments and structure of bryostatin 3.
π SIMILAR VOLUMES
## Abstract The ^13^CβNMR. spectra of a number of colchicine derivatives are given comprising examples of the normal series (**4β10**), iso series (**11β16**) and colchicine series (**17**), which were either reported in the literature or obtained by partial synthesis or degradation reactions. The
1 H and 13 C NMR spectral data for phytochelatin, NH 3 C --Glu-Cys 2 -Gly-COO , were assigned by a combination of one-( 1 H, 13 C) and two-dimensional (DQF-COSY, CH-COSY, HMBC) NMR experiments.
The indole alkaloid strychnobrasiline was studied using one-and two-dimensional NMR techniques. The interpretation of these spectra led to the complete assignments of all carbon and proton chemical shifts.
The complete assignments of 1H and 13C NMR data for a series of synthesized diosgenyl saponin analogs are described, viz. diosgenyl b-D-glucopyranoside (1), diosgenyl a-L-rhamnopyranosyl- 7). The assignments were achieved using homo-and heteronuclear two-dimensional NMR techniques.
In addition to 1D NMR methods and 2D shift-correlated NMR techniques (COSY and HETCOR), spin-spin simulation and MMX calculations, to obtain the minimum energy conformation structure, were used for the complete 1 H and 13 C NMR assignments of stephalic acid.