Angustifolin,a coumarin from Ruta angustifolia

From the aerial parts of Ruta angustifolia, a new natural coumarin, angustifolin, was obtained. Two other coumarins (scoparone and 6,7,8-trimethoxycoumarin) and the alkaloid graveolin were also isolated.     

Omphamurin-a new coumarin from Murraya omphalocarpa

A new coumarin, omphamurin, isolated from the n-hexane extract of the leaves of Murraya omphalocarpa, was characterized as 5,7-dimethoxy-8-(2′-hydroxy-3′-methyl-3′-butenyl) coumarin by chemical evidence and spectral data.     

New coumarins from Coleonema album

Six coumarins have been isolated from the aerial parts of Coleonema album and identified as ulopterol, 7-(3′, 3′-dimethylallyloxy)-coumarin, (R)-(+)-2′,3′-epoxy-suberosin, and the novel coumarins (R)-(+)-7-(2′, 3′-epoxy-3′-methylbutoxy)-coumarin, (R)-(+)-7-(2′,3′-dihydroxy-3′-dihydroxy-3′-methylbutoxy)-coumarin and (R)-(+)-7-methoxy-8-(2′,3′-epoxy-3′-methylbutoxy)-coumarin.     

Coumarins from Amyris balsamifera

Two new coumarins have been isolated from the aerial parts of Amyris balsamifera. On the basis of spectral and chemical data, these have been identified as (R)-(+)-6-(2′-hydroxy-3′-methyl-3′-butenyl)-7-methoxycoumarin and balsamiferone, 7-hydroxy-3,6-bis (3′-methyl-2′-butenyl)-coumarin.     

Koenoline,a further cytotoxic carbazole alkaloid from Murraya koenigii

Koenoline, a carbazole alkaloid, has been isolated from the root bark of Murraya koenigii for the first time as a natural product. Its structure was established as 1-methoxy-3-hydroxymethylcarbazole by analysis of spectroscopic data and was confirmed by partial synthesis from murrayanine isolated from M. siamensis roots. Koenoline exhibited cytotoxic activity against the KB cell-culture test system.     

Structure of the carbazole alkaloid isomurrayazoline from Murraya koenigii

The structure of a new hexacyclic carbazole alkaloid from Murraya koenigii has been shown to be 9a,10,11,12,13,13a-hexahydro-5,9,9,12-tetramethyl-1     

A new coumarin from Perezia multiflora

A new highly oxidized coumarin was isolated from the roots of Perezia multiflora. Its structure was elucidated as 3,4,8-trimethoxy-6-hydroxy-5-formyl-2$\text{H}$-1-benzopyran-2-one.     

7-Phenylacetoxy coumarin from limonia crenulata

A new coumarin, 7-phenylacetoxycoumarin, has been isolated from Limonia crenulata along with luvangetin, xanthotoxin, umbelliferone and limonin. This is the first report of a coumarin phenol ester from a natural source.     

Onognaphalin,a further 5-methyl coumarin from Onoseris gnaphalioides

From the roots of Onoseris gnaphalioides in addition to a known 5-methyl coumarin a new type was isolated. The aerial parts contain a glucoside of 4-hydroxy-5-methyl coumarin. From Gerbera ambigua a compound related to the possible precursor of the 5-methyl coumarins was isolated.     

Toddasin,a new dimeric coumarin from Toddalia asiatica

A new dimeric coumarin, named toddasin and possessing a cyclohexene ring with a vinylic side-chain interposed between the two coumarin moieties has been isolated from the roots of Toddalia asiatica. It has been characterized as (E)-8,8′-[1″,4″-dimethyl-3″ -cyclohexen-1″,2″-ylene vinylene]-bis-[5,7-dimethoxycoumarin] (1). The proposed structure is supported by the mass fragmentation of its dihydro derivative (2).     

Coumarins from unripe fruits of Poncirus trifoliata

Petrol extracts of unripe fruits of Poncirus trifoliata L. were found to contain 7-geranyloxycoumarin, bergapten, imperatorin, 6-methoxy-7-geranyloxycoumarin and two new coumarins which were shown by chemical and spectroscopic means to be 7-(3′-methyl-2′,3′-epoxybutyloxy)-8-(3″-methyl-2″,3″-epoxybutyl)coumarin and 7-(3′-methyl-2′,3′-epoxybutyloxy)-8-(3″-methyl-2″-oxobutyl)coumarin respectively.     

Structure revision of the coumarin,ceylantin

Ceylantin, isolated from Atalantia ceylanica, has been found to be identical with racemosin, isolated from A. racemosa, and the revised 5,8-dimethoxy-6,7-pyranocoumarin structure confirmed by nuclear Overhauser experiments.     

Toddanol and toddanone,two coumarins from Toddalia asiatica

Two new constituents isolated from the roots of Toddalia asiatica and designated as toddanol and toddanone have been characterized as 5,7-dimethoxy-6-(2-hydroxy-3-methylbut-3-enyl)coumarin (1) and 5,7-dimethoxy-6-(3-methyl-2-oxobutanyl)coumarin (3), respectively, by spectral analysis and interconversion experiments.     

Polymethoxylated flavonoids from Murraya paniculata (L.) Jack

A new flavone, 3′-hydroxy-5,6,7,4′,5′-pentamethoxyflavone (1), and three natural products (7, 10, and 14) were isolated from the leaves and twigs of Murraya paniculata (L.) Jack, together with 10 reported polymethoxylated flavonoids. The structure of compound 1 was elucidated on the basis of comprehensive analysis of 1D and 2D NMR and HRMS spectroscopic data. Moreover, the chemotaxonomic significance of these compounds was also discussed.     

Flavonols and coumarins from the fruit of Murraya omphalocarpa

Separation of the ethanolic extract of the fruit of Murraya omphalocarpa afforded a new flavonol, murrayanol, which was characterized as 5,4′-dihydroxy-3,6,7,3′,5′-pentamethoxyflavone, together with the known substances coumurrayin, mexoticin, 3,5,6,7,3′,4′,5′-heptamethoxyflavone, 5,7-dimethoxy-8-(3′-methyl-2′-oxobutyl) coumarin and sitosterol.