Israel Agranat

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Most of the new drugs reaching the market today are single enantiomers, rather than the racemic mixtures that dominated up to ten years ago. Many of the new single-enantiomer drugs were developed as such, but there are also important examples of new single-enantiomer drugs derived from 'chiral switches' of established racemates. Indeed, a well-timed chiral(More)
A systematic and comprehensive study of the conformational spaces of the Cinchona alkaloids quinine, quinidine, cinchonine, cinchonidine, epiquinine, epiquinidine, epicinchonine, and epicinchonidine using the semiempirical PM3 method is described. The results were analyzed in terms of syn/anti and open/closed/hindered and alpha/beta/gamma conformations.(More)
The tumorigenic activities of benzo[a]pyrene (BP) and 6-fluorobenzo[a]pyrene (6-F-BP) were compared to determine whether an unsubstituted 6-position is important for the carcinogenic effect of BP. Highly purified samples of 6-F-BP and BP had similar activities for the induction of lung adenomas in Swiss Webster mice treated before weaning. The 6-fluoro(More)
The solid state structures of (+/-)- and (+)-nefopam hydrochloride (3,4,5,6-tetrahydro-5-methyl-1-phenyl-1H-2,5-benzoxazocine hydrochloride, 1) were determined by single crystal X-ray diffraction analysis. (+/-)-Nefopam hydrochloride gave crystals belonging to monoclinic P21/c space group, and at 298 K: a = 11.766 (1) A, b = 7.741 (1) A, c = 16.907 (3) A,(More)
The pyramidal inversion mechanism of simple sulfoxides was studied, employing ab initio and DFT methods. The convergence of the geometrical and energetic parameters of H2SO and DMSO with respect to the Hamiltonian and basis set was analyzed in order to determine a computational level suitable for methyl phenyl sulfoxide (3), methyl 4-cyanophenyl sulfoxide(More)
The pyramidal inversion mechanisms of the 6-methoxy and the 5-methoxy tautomers of (S)-omeprazole were studied, employing ab initio and DFT methods. The conformational space of the model molecule (S)-2-[(3-methyl-2-pyridinyl)methyl]sulfinyl-1H-benzimidazole was calculated, with respect to rotations around single bonds, at the B3LYP/6-311G(d,p) level. All of(More)