A novel hasubanan alkaloid has been isolated along with the known aknadinine from the fresh roots of Stephania sutchenensis.Its structure has been established as 1—nitroaknadinine from detailed spectral studies and c...A novel hasubanan alkaloid has been isolated along with the known aknadinine from the fresh roots of Stephania sutchenensis.Its structure has been established as 1—nitroaknadinine from detailed spectral studies and confirmed by chemical correlation with aknadinine.The novel alkaloid is the first nitro-hasubanan and also the first example of naturally occurring nitro—alkaloids.展开更多
Chemical investigation of O-Zhang-Ye fuzi, cultivated Aconitum carmichaeli Debx., from Zhong-Ba, Sichuan, resulted in the isolation of a new alkaloid, aldohypaconitine (1), along with the known alkaloids: hypaconitine...Chemical investigation of O-Zhang-Ye fuzi, cultivated Aconitum carmichaeli Debx., from Zhong-Ba, Sichuan, resulted in the isolation of a new alkaloid, aldohypaconitine (1), along with the known alkaloids: hypaconitine (2),mesaconitine, aconitine, neoline, fuziline, songorine, and songoramine. Songoramine has not been reported previously in this plant. The structure of 1 has been established on the basis of spectral methods, and confirmed by chemical correlation with hypaconitine (2).展开更多
Further chemical study on the fresh roots of Stellaria delavayi led to the isolation of another new cyclopeptide, namely stelladelin D. On the basis of spectroscopic analyses and chemical methods, its structure was as...Further chemical study on the fresh roots of Stellaria delavayi led to the isolation of another new cyclopeptide, namely stelladelin D. On the basis of spectroscopic analyses and chemical methods, its structure was assigned as cyclo (Gly-Val-Pro-Ser-Pro-Tyr-Phe-Pro-Ala-Ala-Ile) In previous papers((1,2)), we have reported the structural elucidation of three new cyclopeptides named stelladelin A-C from the fresh roots of Stellaria delavayi. Further chemical study on this plant led to the isolation of another new cyclopeptide, namely stelladelin D. In this paper, we shall report its structural elucidation.展开更多
A new cyclopeptide named arenarin A(1) was obtained from the roots of Arenaria juncea Bieb and its structure was established to be cyclo(Ser-Ser-Phe-lle-Pro-Phe)by a combination of 2D-NMR and FABMS.
From the fresh roots of Stellaria yunnanensis two new cyclopcptides,stellarin B(1)and C(2),were obtained and on the basis of the spectral methods their structures were established to be cyclo(Gly-Ser-HOIle-Phe-phe-Al...From the fresh roots of Stellaria yunnanensis two new cyclopcptides,stellarin B(1)and C(2),were obtained and on the basis of the spectral methods their structures were established to be cyclo(Gly-Ser-HOIle-Phe-phe-Ala)and cyclo(Gly-Ser--HOIle-Phe-Phe-Ser),respectively.展开更多
文摘A novel hasubanan alkaloid has been isolated along with the known aknadinine from the fresh roots of Stephania sutchenensis.Its structure has been established as 1—nitroaknadinine from detailed spectral studies and confirmed by chemical correlation with aknadinine.The novel alkaloid is the first nitro-hasubanan and also the first example of naturally occurring nitro—alkaloids.
文摘Chemical investigation of O-Zhang-Ye fuzi, cultivated Aconitum carmichaeli Debx., from Zhong-Ba, Sichuan, resulted in the isolation of a new alkaloid, aldohypaconitine (1), along with the known alkaloids: hypaconitine (2),mesaconitine, aconitine, neoline, fuziline, songorine, and songoramine. Songoramine has not been reported previously in this plant. The structure of 1 has been established on the basis of spectral methods, and confirmed by chemical correlation with hypaconitine (2).
文摘Further chemical study on the fresh roots of Stellaria delavayi led to the isolation of another new cyclopeptide, namely stelladelin D. On the basis of spectroscopic analyses and chemical methods, its structure was assigned as cyclo (Gly-Val-Pro-Ser-Pro-Tyr-Phe-Pro-Ala-Ala-Ile) In previous papers((1,2)), we have reported the structural elucidation of three new cyclopeptides named stelladelin A-C from the fresh roots of Stellaria delavayi. Further chemical study on this plant led to the isolation of another new cyclopeptide, namely stelladelin D. In this paper, we shall report its structural elucidation.
文摘A new cyclopeptide named arenarin A(1) was obtained from the roots of Arenaria juncea Bieb and its structure was established to be cyclo(Ser-Ser-Phe-lle-Pro-Phe)by a combination of 2D-NMR and FABMS.
文摘From the fresh roots of Stellaria yunnanensis two new cyclopcptides,stellarin B(1)and C(2),were obtained and on the basis of the spectral methods their structures were established to be cyclo(Gly-Ser-HOIle-Phe-phe-Ala)and cyclo(Gly-Ser--HOIle-Phe-Phe-Ser),respectively.
