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Two new 2-amino-2-butenoic acid (Dhb)-containing microcystins (Dhb-microcystins), ( d -Asp 3 , ( E )-Dhb 7 )microcystin-LR ( 1 ) and -HtyR ( 2 ), were isolated from Oscillatoria agardhii . The structures were elucidated by the extensive NMR analyses and confirmed by mass spectral and amino acid...
The structure of N -formyl, N -acetyl- N -methyl, and N -acetyl glycosylamines has been studied by NMR spectroscopy in solution, single crystal X-ray diffractometry, and corroborated by PM3 semiempirical calculations. The results quite agree with an anti conformation around the glycosydic bond...
Petrocortynes A-C ( 1–3 ) and petrosiacetylenes A-D ( 4–7 ), novel long-chain polyacetylenes and related metabolites have been isolated from a sponge of the genus Petrosia . Compounds 1 and 2 are C 46 linear tetraacetylenes structurally related to petroformynes while 3 possesses an unusual...
It is demonstrated that nucleotide C4′ radicals may be generated from a C4′-thiolester on treatment with tributyltin hydride. When the reaction is conducted in benzene at reflux the C4′ radical expels the C3′-phosphate group to give a radical cation. This species undergoes deprotonation...
The iron Lewis acid 1 was found to catalyze reactions of phenyldiazomethane and aromatic aldehydes to give cis -epoxides along with the corresponding ketones. The yield of the epoxide increased with electron-withdrawing substituents on the aldehyde, while little or no epoxide was formed with...
The oxidation of aliphatic amines by aqueous chlorine has been studied. The kinetic behaviour is similar for primary, secondary and tertiary aliphatic amines, the elementary step being the transfer of chlorine from the hypochlorous acid molecule to the nitrogen of the free amino group....
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