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Enaminones: versatile intermediates for natural product synthesis
Efforts in our laboratories to devise a general approach to the synthesis of alkaloids focus on the versatile reactivity of enaminones and related compounds containing the structural unit N-CaC-Z (Za… Expand
Vinylogous urethanes in alkaloid synthesis: formal syntheses of Elaeocarpus alkaloids
Abstract The substituted dehydroindolizidine 8 has been prepared from the exocyclic vinylogous urethane 7 via an acylative ring closure. The specific formation of the enolate required for further… Expand
Metabolites of proteaceae. Part VIII. The occurrence of (+)-D-allose in nature: rubropilosin and pilorubrosin from Protea rubropilosa beard
The leaves of Protea rubropilosa Beard contain (+)-D-allose in the form of the 6-O-cinnamate (rubropilosin) and the 6-O-benzoate (pilorubrosin) of 2-hydroxy-4-hydroxymethylphenyl β-D-allopyranoside.… Expand
THE ESSENTIAL OIL OF ILLICIUM ANISATUM LINN.
The oil of the Japanese star anise tree, Illiciumanisatum Linn., was analyzed by gas–liquid chromatography. The major constituents were found to be cineole (18.1%), linalool (10.1%), methyleugenol… Expand
Control of metal ion selectivity in ligands containing neutral oxygen and pyridyl groups
The stabilities of the complexes of the ligand (py)/sub 2/-18-aneN/sub 2/O/sub 4/ (N,N'-bis(o-pyridylmethyl)-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane) at 25/sup 0/C in 0.1 M NaNO/sub 3/ are… Expand
Metabolites of proteaceae. 8. The occurrence of (+)-D-allose in nature: rubropilosin and pilorubrosin from Protea rubropilosa Beard.
Metabolites of proteaceae. Part V. Reflexin and conocarpic acid from Leucospermum reflexium Buek ex Meisner, and the phenol-dienone rearrangement of reflexin and conocarpin
Reflexin is obtained from leaves of Leucospermum reflexum Buek ex Meisner by extraction with methanol and is shown to correspond to the methyl ester of the ring-A-opened form of conocarpin, viz.… Expand
Formal syntheses of (±)-mesembrine and (±)-dihydromaritidine
Abstract Condensation of 3-arylated Δ 1 -pyrrolinium salts with t -butyl 3-oxopent-4-enoate 3 followed by treatment with trifluoroacetic acid yielded the alkaloid Δ 7 -mesembrenone 1 and its N-benzyl… Expand
Thiolactams in alkaloid synthesis: A particularly short synthesis of -Δ7 -mesembrenone
Abstract The title compound was prepared from chloromethyl vinyl ketone and 1-methyl-3-(3,4-dimethoxyphenyl)pyrrolidine-2-thione in a novel one-pot procedure involving S-alkylation, sulphur extrusion… Expand