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A new route for the synthesis of the title compounds 4a, 4b, 10a , and 10b has been developed via ozonolysis of 2- endo -7- anti -diacylnorbornenes 3a, 3b, 9a , and 9b . The synthesis of the unsubstituted (parent) compound 4a of tetraacetal tetraoxa-cages has been accomplished for the first time...
N -acyliminium cyclizations onto thiophene to give thieno(2′,3′:3,4)pyrrolo(2,1-a)isoindolone ( 2b ) and benzo(a)thieno(2,3(3,2 or 3,4)-g)indolizinones ( 12a-c ) were studied.
Several Diels-Alder and 1,3-dipolar cycloadditions to C 60 were performed, under microwave irradiation, in a modified domestic microwave oven and a focused microwave reactor. Reactions proceed within minutes to afford the respective cycloadducts in similar or increased yields related to the...
(5- 13 C) and (6- 13 C) ubiquinones-3 ( 20a and 20b ) were synthesised from (1- 13 C) trichloroacetic acid ( 8a ) in 12 steps. The key step was a Diels Alder reaction between 2,5-bis (trimethylsilyloxy)-3-methylfuran ( 2 ) and (2- 13 C) 2-bromo-1,1-dichloroethylene ( 4a ) to afford an...
Condensation of 2-aminopyridine with glyoxal proceeds with high selectivity to a mixture of meso and dl diol 7 to be easily transformed into the corresponding bicyclooctane 2a and 3a with formaldehyde and acetonitrile as solvent. In water, however, the reaction selectively produces imidazolidine...
The reaction of α,β-unsaturated ketones 1 with an excess of lithium powder, a catalytic amount of naphthalene (4 %) and different carbonyl compounds in the presence of boron trifluoride in THF at −78 – 0°C yields, after treatament with silyl nucleophile and final hydrolysis, the expected...
Treatment of α-hydroxylamino and α-(O-acetyl)-hydroxylamino oximes, derived from nitrosochlorides of the monoterpenes α-pinene and (+)-3-carene, with sodium borohydride in acetonitrile medium results in rearrangement by ring-expansion and formation of chiral cyclic amidoximes in 35–65%...
Pertosylated polyaza(n)(9,10)antracenophanes have been obtained in high yields by a modification of the Richman-Atkins methodology. Molecular Mechanics calculations as well as the crystal structure of the N,N′,N″,N‴-Tetratosyl-2,6,9,13-tetraaza(14)(9,10)anthracenophane 4 derivative reveal...
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