- ALKALOIDS OF LITSAEA LAETA AND L. SALICIFOLIA
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The structure for laetine (2-hydroxy-1-methyl 10,11-methylenedioxy noraporphine), a new alkaloid from the bark of Litsaea laeta has been established.N,O-Dimethylharnovine and glaucine were also isolated from the same source.C-2 hydroxy aporphines are characteristic of L. laeta.Two known alkaloids, dicentrinone and nordicentrine, have also been isolated from the leaves of L. salicifolia. - Key Word Index: Litsaea laeta; L. salicifolia; Lauraceae; new noraporphine alkaloid; structure determination.
- Rastogi, R. C.,Borthakur, N.
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- Synthesizing method of oxidized dicentrine
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The invention discloses a synthesizing method of oxidized dicentrine. The synthesizing method comprises the following steps of using 3,4-dimethoxyphenylacetic acid as the start raw material, reactingwith bromine to obtain a product, and then reacting with
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Paragraph 0042; 0059-0060
(2019/03/28)
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- Novel total syntheses of oxoaporphine alkaloids enabled by mild Cu-catalyzed tandem oxidation/aromatization of 1-Bn-DHIQs
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Novel total syntheses of oxoaporphine alkaloids such as liriodenine, dicentrinone, cassameridine, lysicamine, oxoglaucine and O-methylmoschatoline were developed. The key step of these total syntheses is Cu-catalyzed conversion of 1-benzyl-3,4-dihydro-isoquinolines (1-Bn-DHIQs) to 1-benzoyl-isoquinolines (1-Bz-IQs) via tandem oxidation/aromatization. This novel Cu-catalyzed conversion has been studied in detail, and was successfully used for constructing the 1-Bz-IQ core.
- Zheng, Bo,Qu, Hui-Ya,Meng, Tian-Zhuo,Lu, Xia,Zheng, Jie,He, Yun-Gang,Fan, Qi-Qi,Shi, Xiao-Xin
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p. 28997 - 29007
(2018/08/29)
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- Alkaloids of Machilus glaucescens Wight: Machigline, A New Phenolic Oxoaporphine Alkaloid
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Machigline (I), a new phenolic oxoaporphine alkaloid, isolated along with atheroline (II) and β-sitosterol-O-β-D-glucoside from the alcohol extract of the leaves of Machilus glaucescens Wight (Lauraceae), has been shown to be 1,2-methylenedioxy-9-hydroxy-10-methoxyoxoaporphine by spectral and chemical studies.A fatty ketol characterised as a rarely occurring n-hentriacotan-10-ol-16-one (10-hydroxypalmitone) (III); (first report of its occurrence in Lauraceae) has also been isolated as an aliphatic constituent from the CHCl3 extract of the plant besides the lignan and nor-lignan constituents.The mass fragmentation of I and III have been delinated.The isolation of machigline and atheroline constitutes the firsent report on the occurrence of oxoaporphines in Machilus species, and machigline adds a new name to the list of only a few phenolic oxoaporphines.
- Talapatra, Bani,Goswami, Shyamaprosad,Ghosh, Arindum,Talapatra, Sunil K.
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p. 1364 - 1368
(2007/10/02)
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- FREMY'S SALT OXIDATION OF SOME ISOQUINOLINE ALKALOIDS. BIOGENETIC CONSIDERATIONS
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Fremy's salt oxidation of benzylisoquinoline and aporphine alkaloids to isoquinolones and oxoaporphines is described.Aminium radicals are suggested to account for the observed results.Their possible involvement in alkaloid biosynthesis is considered.
- Castedo, Luis,Puga, Alberto,Saa, Jose M.,Suau, Rafael
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p. 2233 - 2236
(2007/10/02)
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