(–)-Argemonine hemihydrate

Nečas, Marek; Dostál, Jiřı́; Slavík, Jiří

doi:10.1107/s010827010001252x

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Nmr Spectroscopy1

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2001

2002

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Cited by 2 publications

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“…Interactions with the nitrogen atom were observed for the signals of H-6 and H-17 (NMe) two bonds away, and for H-5A separated by three bonds (the dihedral angle H5A-C5-C6-N is 170°). 18 Owing to the rigidity of the basic skeleton, an identical stereochemical arrangement in the crystal and in the solution is expected. Proton-proton coupling constants are described in the Experimental section.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

Isoquinoline alkaloids: a ¹⁵N NMR and x‐ray study. Part 2

Marek

Dostál

et al. 2002

Magnetic Reson in Chemistry

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Continuing our systematic15 N NMR study of isoquinoline alkaloids, we report a contribution extending our previous paper. The 15 N NMR chemical shifts and 15 N, 1 H long-range coupling pathways of tertiary and quaternary isoquinoline alkaloids of several constitutional types are presented. The selected compounds belong to the protoberberine, proaporphine, pavinane, rhoeadine and phtalideisoquinoline classes of alkaloids and were investigated by gradient-selected inverse-detected multiple bond correlation experiments (GHMBC and GSQMBC). In addition, x-ray data and the principal geometric parameters of stylopine, mecambridine, norchelerythrine, isothebaine and mecambrine are reported and discussed.

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Section: Nmr Spectroscopymentioning

confidence: 99%