A new carbazole alkaloid, designated as murrayakoeninol, was isolated from the leaves of Murraya koenigii (Linn) Spreng, along with four known carbazole alkaloids, viz. mahanimbine, koenimbine, O-methylmurrayamine-A and murrayazolinine and one from the bark viz. girinimbine. The structure of the new alkaloid 1 was elucidated on the basis of 2D NMR spectral analysis and chemical reactions.

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The plant Murraya koenigii, commonly known as curry leaf tree is a rich source of carbazole alkaloids. A number of monomeric as well as dimeric carbazoles with C13, C18 and C23 skeleton have been isolated from the plant. In my present work, a new carbazole alkaloid, designated as mumunine, was isolated from the bark of Murraya koenigii (Linn) Spreng, along with a known carbazole alkaloid, viz. mahanimbine. The structure of the new alkaloid 1 was elucidated on the basis of 1D and 2D NMR spectral data analysis. In this paper, the isolation and structure elucidation of the new compound will be discussed in detail.

A new benzopyridoquinolizine alkaloid, designated as angustinine (1), was isolated from the root bark of Alangium lamarckii Thwaites, along with the known ipecac alkaloid, emetine. Investigation of the stem bark of the same plant resulted in the isolation of another known ipecac alkaloid, cephaeline. The structure of the new alkaloid (1) was elucidated on the basis of 2D NMR spectral analysis.

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