Alkaloide aus der thailändischen Menispermaceen‐Droge Krung Kha Mao (Cyclea barbata), 5. Mitt. Isolierung und Strukturaufklärung weiterer Bisbenzylisochinolin‐Alkaloide

Dahmen, K. H.; Pachaly, P.; Zymalkowski, F.

doi:10.1002/ardp.19773100204

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1977

1993

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Cited by 14 publications

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“…A ROESY experiment confirmed these assignments. In particular, effects were observed between H-5' (6.55 ppm) and 6'- The mass spectrum of ( + )tetrandrine-2'-ß--oxide [3] displays a weak molecular ion at mlz 638 (16%), which corresponds to C38H42N207. The base peak at mlz 622 is due to the loss of an oxygen atom and suggests the presence of an N-oxide function.…”

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confidence: 97%

Bisbenzylisoquinoline Alkaloids from Cyclea barbata

Guinaudeau

Lin²,

Ruangrungsi³

et al. 1993

J. Nat. Prod.

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Continuing studies of the alkaloidal fraction from the roots of Cyclea barbata afforded two new bisbenzylisoquinoline alkaloids, namely, (-)-2'-norlimacine [1] and (+)-cycleabarbatine [2]. The known (+)-tetrandrine-2'-beta-N-oxide [3], for which the configuration of the N-oxide function is now assigned, was identified, as were (+)-berbamine, (-)-repandine, (+)-cycleanorine, (+)-daphnandrine, (-)-curine, (+)-coclaurine, and (-)-N-methylcoclaurine.

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confidence: 97%