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Studies in mass spectroscopy—II : Mass spectra of substituted furans
Abstract The mass spectra of 29 furans, variously substituted with alkyl, aldehyde, ketone, ester, nitrile and nitro groups are reported and discussed. The spectra are generally quite simple andExpand
  • 33
Unusual indole alkaloids from Ophiorrhiza blumeana Korth
The alkaloid content of two different collections of Ophiorrhiza blumeana Korth. (Rubiaceae) was investigated. The first collection yielded the known alkaloid bracteatine 5 and two new alkaloidsExpand
  • 17
The Alkaloids ofOphiorrhiza filistipula
Extraction of the fresh leaves of Ophiorrhiza filistipula ( Rubiaceae ) has yielded the alkaloids normalindine (2), 7-methoxycamptothecin (6) and strictosidinic acid (II). The configurations of theExpand
  • 28
Viroallosecurinine and ent-Phyllanthidine From the Leaves of Breynia coronata (Euphorbiaceae)
Extraction of the fresh leaves of Breynia coronata has yielded the Securinega alkaloids viroallosecurinine (4) and ent-phyllanthidine (6).
  • 22
The synthesis of desertorin C, a bicoumarin from the fungus Emericella desertorum
The structure of desertorin C, a metabolite of the mould Emericella desertorum, is confirmed as 4,4′,7,7′-tetramethoxy-5,5′-dimethyl-6,8′-bicoumarin (6), by its synthesis in racemic form. The keyExpand
  • 17
Naturally-Occurring Dibenzofurans. X. A New Synthesis of Di-O-Methylstrepsilin
A new synthesis of 4,8-dimethoxy-10-methylisobenzofuro[5,4- b]benzofuran-3(1H)-one (di-O-methylstrepsilin) (2), a derivative of the lichen dibenzofuran strepsilin (1), is described.
  • 7
Depsidone synthesis. Part 24. The synthesis of epiphorellic acid 2. A pseudodepsidone and X-ray crystal structure of a grisadienedione epoxide
The synthesis of the unusual pseudo-depsidone epiphorellic acid 2 (2){6-hydroxy-3-[5-hydroxy-2-methoxycarbonyl-3-(3-oxopentylphenoxy]-4-methoxy-2-pentylbenzoic acid} by a route involvingExpand
  • 13
A new glucoalkaloid from Uncaria glabrata
Extraction of the bark of Uncaria glabrata DC (Rubiaceae) has yielded an unusual indole mono-terpenoid glucoalkaloid, glabratine, for which structure 7 is proposed on the grounds of its spectral data.
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