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The synthesis of a new class of azaxanthones is presented. The N – O functionality of 1-hydroxypyrazole and 1-hydroxy-1,2,3-triazole was used to direct metalation and subsequently incorporated in the new ring systems.
The stereoselective synthesis of tetrahydrofurans has been achieved from bromoalkynes and bromoalkenes by intramolecular radical cyclisation using a hypophosphite salt. This radical cyclisation strategy has successfully been applied to the total synthesis of a naturally occurring bioactive...
Synthesis of β-sulfenyl endoperoxides 9 was achieved by a four component sequential free radical reaction based on the application of the thiol-olefin-co-oxygenation reaction to monoterpenes, followed by in situ treatment with triphenylphosphine. β-Sulfenyl endoperoxides 9 were oxidized with m...
A series of ethynyl and aryl substituted porphyrins and the corresponding metallated derivatives have been synthesised and characterised.
A theoretical study of the structures of a series of 5-substituted-6-phenyl-3(2 H )-pyridazinones has been carried out using quantum-mechanical calculations. This study indicates a significant effect of the nature of the substituent at the 5-position on the reactivity of this system. The results...
Ultraviolet irradiation of (4 R ,5 S ,7 S ,8 R ,9 S ,10 R ,11 R )-7,8,9-triacetyloxy-1-oxolongipin-2-ene ( 2 ) afforded the vulgarone A 7 and the pingilonene 8 derivatives as the major products, which were formed by a (1,3)-shift, together with the minor secondary photoproducts 9 and 10 . The...
The synthesis of p -acetyl and p -benzoyl derivatives of various benzylsilanes ( p -R 1 CO–C 6 H 4 –CR 2 R 3 –SiMe 3 : R 1 , R 2 , R 3 =Me, H, H; Me, H, Ph; Me, H, Me; Me, Me, Me; Ph, H, H; Ph, H, Ph; Ph, H, Me; Ph, Me, Me), xanthenes (3-benzoyl and 3,6-dibenzoyl), and 9-Me 3 Si-xanthenes...
A practical total synthesis of AK-toxins (AK-toxin I, 1 ; II, 2 ), host-specific toxins against the Japanese pear, has been achieved in 10% total yield, starting from the key intermediate 6 . The (2 E ,4 Z ,6 E )-conjugated triene system was successfully constructed by the use of the Stille...
When α-bromo-α-fluoro-β-hydroxy esters were allowed to react successively with trimethylaluminum in toluene at −15°C for 0.5 h and with tributyltin hydride in the presence of a catalytic amount of triethylborane at −15°C for 4 h, the corresponding threo -α-fluoro-β-hydroxyalkanoates...
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