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Total synthesis and absolute configuration of minalemine A, a guanidine peptide from the marine tunicate Didemnum rodriguesi.
The total synthesis of the 3S,2S and 3R,2S diastereomers (1a and 1b) of minalemine A and the identification of the natural compound as the 3R,2S isomer is described. The key step in the synthesis isExpand
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Intramolecular cyclopropanation: stereospecific synthesis of (E)- and (Z)-1-aminocyclopropane-1-carboxylic acids
tert-Butyl-substituted allyl malonates, prepared in two steps from malonic acid, are diazotized in high yields. The diazomalonates 7 undergo a stereospecific copper(I)-catalyzed cyclopropanation toExpand
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Inconsistency in the detection of phytotoxic effects: A test with Acacia dealbata extracts using two different methods
Abstract The phytotoxic activity of novel natural compounds is generally evaluated by the bioassay-directed fractionation procedure conducted with bioassays on model species. Two differentExpand
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Cesium concentration effect on Pt/Cs beta zeolite/γ-alumina catalysts for n-heptane conversion
Catalytic behavior of platinum catalysts supported on Cs beta zeolite/γ-alumina, for n-heptane reforming reactions, was studied. Cs concentration in the beta zeolite varied from 0 to 0.84 wt.%, inExpand
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Carbonylation with CO2 andPhosphorus Electrophiles: A Convenient Method for the Synthesisof 2-Oxazolidinones from 1,2-Amino Alcohols
2-Oxazolidinones were prepared in good yields from 1,2-amino alcohols and CO 2 in the presence of tetramethyl-phenylguanidine (PhTMG) as a base and a variety of phosphorus electrophiles under mildExpand
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