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Alkyl, allyl, and propargyl β-iodopropionates undergo a cyclopropanation by the reaction with zinc-copper couple and TBDMSCl in THF to give 1-alkoxy-, 1-allyloxy-, and 1-propargyloxy-1- tert -butyldimethylsiloxycyclopropanes in moderate or good yields. β-Iodo-α-methylpropionates 2 and 6...
A series of fourteen derivatives of pyrazole have been calculated at the MP2-6-31G ∗∗ level. The first thirteen are derivatives of the parent pyrazole with different substituents on the nitrogen N(1) and the last one is pyrazole N -oxide. The substituents have been selected to cover a wide...
A successful design for the construction of C 20 gibberellin framework has been described. The key features of the synthesis are as follows: (a) Pd 2+ -promoted cycloalkenylation reaction ( 6 → 5 ) and (b) intramolecular Diels-Alder reaction ( 4 → 3 ).
The solvolysis of 7,7-bis(trifluoromethylsulfonyloxy)-2-norbornene ( 1a ), 1-trifluoromethylsulfonyloxy-1-phenylethylene ( 2a ), 2-methyl-1-cyclohexen-1-yl triflate ( 3a ) and 4-camphenyl triflate ( 4a ) in carbon disulfide or diethyl ether with added MgI 2 and MgBr 2 yields a mixture of the...
A new approach to produce heterofullerenes is described. Starting from a fullerene with an intact cage which is activated by suitable exohedral functionalization, the first aza-heterofullerene is generated in the gas phase under DCI mass-spectrometric conditions. On the basis of AMI-calculations...
A series of mesoionic thiazoles 2 were generated and converted in situ by treating the 5-aminothiazolium chlorides 1 with several electrophilic dipolarophiles in the presence of DBN or NEt 3 . The reactions involved an 1,3-dipolar cycloaddition of the “masked” cyclic azomethine ylides across...
Three novel cyclooctadiazabiaryl ligands, namely cycloocta(2,1−b:3,4−b′)dipyridine (3), cycloocta(2,1−b:3,4−b′)diquinoline (4) and cycloocta(2,1−b:3,4−b′)di(1,8)naphthyridine (5) have been synthesized and a number of metal complexes have been prepared for these novel ligands....
Results are presented on molecular dynamics (MD) simulations of (T ∗ T) dimers linked by a novel chemical functionality — the m ethylene m ethyl i mino (MMI) backbone designed as a neutral replacement for the negatively charged phosphodiester group in wild type nucleic acids. Simultaneous...
( S )-(+)-3′-Fluoroabscisic acid ( 5a ) was synthesized as an analogue of abscisic acid that can resist the metabolic cyclization of 8′-hydroxyabscisic acid to phaseic acid due to increased electron density at C-2′. The inhibitory activity of 5a was slightly higher than that of abscisic...
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