Synthesis and 13C nuclear magnetic resonance spectral analysis of some diterpenoids related to the cleistanthane type hydrocarbon isolated from Amphibolisantarctica

1987 ◽  
Vol 65 (9) ◽  
pp. 2024-2026 ◽  
Author(s):  
Teodoro S. Kaufman ◽  
Mirta P. Mischne ◽  
Manuel Gonzalez-Sierra ◽  
Edmundo A. Ruveda
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Spectral Analysis ◽  
Magnetic Resonance ◽  
Natural Product ◽  
Spectral Data ◽  
Side Chain ◽  
13C Nuclear Magnetic Resonance ◽  
Related Compounds ◽  
Nuclear Magnetic

The synthesis of the cleistanthane-type diterpene 13 (8-β(H), 14-β-ethyl, 13-methylene podocarpane), a dihydro epimer of the natural product 6, is described. By comparison of the 13C nuclear magnetic resonance spectral data of 13 and related compounds with those reported for 6, the stereochemistry of the C-14 side chain of the latter was confirmed.

Carbonyl-bridged and related compounds. Structural assignments by nuclear magnetic resonance spectroscopy

1967 ◽  
Vol 45 (11) ◽  
pp. 1201-1207 ◽  
Author(s):  
C. F. H. Allen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Spectral Data ◽  
Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectra ◽  
Related Compounds ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The spectral data, predominantly nuclear magnetic resonance spectra, of a number of carbonyl-bridged and related compounds have been examined. In most instances they confirm the structures arrived at by classical procedures, but in some instances revisions have been made.

Microbial hydroxylation of steroids. 7. Hydroxylation of B-nortestosterone and related compounds by Rhizopus arrhizus ATCC 11145, and 13C nuclear magnetic resonance spectra of some B-norsteroids

1981 ◽  
Vol 59 (11) ◽  
pp. 1651-1655 ◽  
Author(s):  
Herbert L. Holland
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Rhizopus Arrhizus ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
Mechanism Of Oxidation ◽  
Related Compounds ◽  
Stereoelectronic Interactions ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The incubation of B-norandrost-4-ene-3-ones and B-nor-3β-hydroxyandrost-5-enes with Rhizopus arrhizus ATCC 11145 has been described. The products are consistent with a mechanism of oxidation at C-6 in which the stereochemistry of substitution at C-6 is controlled by stereoelectronic interactions in the substrate, and is not dictated by enzymic constraint during the reaction. The carbon-13 nuclear magnetic resonance spectra of several B-nor-Δ4 and Δ5 steroids have been presented.

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