1-Hydroxyrutaecarpine from Euxylophora paraënsis

The structure of the title compound has been determined on the basis of spectroscopic evidence and synthesis.     

New indolopyridoquinazoline alkaloids from Euxylophora paraënsis

Two new indolopyridoquinazoline alkaloids euxylophoricine C (V) and euxylophorine B (VI), were isolated from the bark of Euxylophora paraënsis Hub. Their structures were elucidated on the basis of spectroscopic as well as chemical properties and confirmed by synthesis.     

Further furoquinolone alkaloids from Ruta chalepensis

Two new alkaloids, 9-ethyl-8-methoxy-furo[2,3]quinol-4-one and 9-ethyl-7,8-dimethoxy-furo-[2,3]quinol-4-one, and the known furocoumarin chalepin were isolated from Ruta chalepensis.     

Alcaloides d'Araliopsis soyauxii. Isolement d'un nouvel alcaloide,l'Araliopsine

Six alkaloids have been isolated from root bark of Araliopsis soyauxii. Five are known, maculine, flindersiamine, skimmianine, (?) ribalinine, (+) isoplatydesmine and the sixth, araliopsine is new; its structure has been established as hydroxyisopropyldihydrofuro-2-quinolone. From the trunk bark four alkaloids have been isolated: flindersiamine, kokusaginine (?) ribalinine, (+) isoplatydesmine.     

New alkaloids from Strychnos icaja

The alkaloids of Strychnos icaja (Loganiaceae) have been studied. An extract from Zaire leaf material yielded nine alkaloids, comprising novacine, the new base 21,22-α-epoxy-4,14-dihydroxy-3-methoxy-N-methyl-sec.-pseudostrychnine, and seven others of known structure previously obtained from the plant. Cameroun leaf material gave five alkaloids, of which one, 21,22-α-epoxy-3,4-dimethoxy-N-methyl-sec.-pseudostrychnine, is new. Fruits from Gabon afforded eight alkaloids; two of them are new and are formulated as 21,22-α-epoxy-4-methoxy-N-methyl-sec.-pseudostrychnine and the corresponding 14-hydroxy derivative.     

Tropane alkaloids from Anthocercis and Anthotroche

In addition to known tropane alkaloids, 3α-iso-butyryloxytropan-6β-ol and 3α-n-butyryloxytropane have been characterized as respective components of the aerial parts of two subspecies of Anthocercis albicans. Aponoratropine, not previously recorded as a natural product, has been detected in the leaves of Anthotroche myoporoides and A. walcottii; similarly aponorhyoscine is indicated as a component of the roots of a subspecies of Anthocercis genistoides.     

Three new alkaloids from Buxus papillosa

Three new steroidal alkaloids have been obtained from Buxus papillosa Schneider. These are (?)-cyclobuxupaline-C (IV)(+)-cyclopapilosine-D (VII) and (+)-buxamine-C (IX). A known alkaloid also present is desoxy-16-buxidienine (X).     

Pyrrolizidine alkaloids from Senecio cacaliaster

Four pyrrolizidine alkaloids have been isolated from Senecio cacaliaster and their structures analysed by spectroscopic methods (IR, mass, ¹H, ¹³CNMR). One of them is new and the name sencalenine (3) is proposed. Alkaloids O⁷-senecioylretronecine (1) and 7-senecioyl-9-sarracinylretronecine (2) have recently been identified elsewhere. The fourth is bulgarsenine (4) which was isolated from a Senecio species before.     

Quaternary alkaloids of Thalictrum foliolosum

The isolation and identification of eleven alkaloids from the quaternary alkaloid fraction of a root extract of Thalictrum foliolosum are described     

Acridone alkaloids from Severinia buxifolia

Two new acridone alkaloids, severifoline and N-methylseverifoline along with the known alkaloids, N-methylatalaphylline, atalaphyllinine and 5-hydroxy-N-methylseverifoline, were isolated from the root bark of Severinia buxifolia. The structures of severifoline and N-methylseverifoline were established by chemical and spectroscopic methods.     

Three quinicine derived alkaloids from Guettarda trimera

Three alkaloids, isolated from the trunk bark of Guettarda trimera have been identified as derivatives of quinicine on the basis of mass spectrometry, ¹H and ¹³C NMR data.     

New alkaloids from Banisteriopsis caapi

Three new alkaloids isolated from Banisteriopsis caapi, were identified as harmic amide (1-carbamoyl-7-methoxy β-carboline), acetyl norharmine (1-acetyl-7-methoxy β-carboline) and ketotetrahydronorharmine (7-methoxy-1,2,3,4-tetrahydro-1-oxo-β-carboline)     

Stem alkaloids of Rauwolfia vomitoria

22 indole alkaloids were isolated from the stem bark of Nigerian Rauwolfia vomitoria and 20 characterized. The alkaloids comprised E-seco heteroyohimbine, sarpagan, dihydroindole, yohimbine and heteroyohimbine types. The biosynthetic relationship of the alkaloids is discussed.     

Bishordeninyl terpene alkaloids and other constituents of Zanthoxylum culantrillo and Z. coriaceum

A new alkaloid, culantraramine, has been found in Zanthoxylum culantrillo, and the known alkaloid, alfileramine, has been identified from Z. coriaceum. Both alkaloids are members of a new structural type, bishordeninyl terpenes. Z. culantrillo was also found to contain eudesmin, epieudesmin, hordenine, N-methylisocorydine, magnoflorine, candicine, skimmianine, synephrine, tembetarine and a dihydroxy-dimethoxytetrahydroprotoberberine. Isolated from Z. coriaceum were N-methylisocorydine, dihydrochelerythrine, chelerythrine, N-methylcanadine and aegiline, in addition to alfileramine.     

A 2-Quinolone alkaloid from Almeidea guyanensis

From Almeidea guyanensis, besides N-methylatanine, N-methylflindersine, N-methylkhaplofoline and 4-demethyl-N-methylatanine, a new 2-quinolone, almeine, has been isolated and its structure elucidated as 4-isopropenyl-N-methyl-3,4-dihydrofuro-2-quinolone.     

Leaf alkaloids of Rauwolfia volkensii

Thirteen alkaloids were isolated and identified from the leaves of Rauwolfia volkensii. The alkaloids included E-seco heteroyohimbine, heteroyohimbine, sarpagan, dihydroindole, pleiocarpamine, picrinine and akuammicine types together with peraksine.     

Four new diterpenoid alkaloids from Delphiniumpentagynum

Four new diterpenoid alkaloids, dihydrogadesine, 14-acetyldihydrogadesine, pentagynine and dihydropentagynine, were isolated and identified in Delphinium pentagynum.     

Distribution of alkaloids in Anthocercis littorea and A. viscosa

The distribution of tropane alkaloids in organs of Anthocercis littorea and A. viscosa is reported. The following alkaloids have been isolated: atropine (hyoscyamine), apoatropine, noratropine (norhyoscyamine), littorine, hyoscine, norhyoscine, meteloidine, 3α, 6β-ditigloyloxytropan-7β-ol, 6β-tigloyloxytropan-3α-ol, 3α-tigloyloxytropane, tigloidine, tropine, ψ-tropine, (?)-tropan-3α-6β-diol, cuscohygrine and unknown bases.