Two Novel Optically Active Penam Derivatives (CROSBI ID 81919)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Danilovski, Aleksandar ; Vinković, Mladen ; Herak, Jure J.
engleski
Two Novel Optically Active Penam Derivatives
The X-ray structure analysis of both optically active penam derivatives (2S, 4S, 5R, 6S)-2-benzylcarbamoyl-6-bromo-3, 3-dimethyl-7-oxo-4-thia-1- azabicyclo[3.2.0]heptane-4-oxide, C~15~H~17~BrN~2~O~3~S.H~2~O (I), and (5R)-3-benzylimino-2-isopropylidene-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane, C~15~H~16~N~2~OS (II), have been determined in order to ascertain their absolute configuration. Both compounds adopted open-book conformation of fused -lactam and thiazolidine ring. The -lactam ring is in a distorted planar conformation while the thiazolidine ring is in an envelope conformation. Pyramidalisation effect of the N1 atom in both compounds has been characterised by nitrogen shift from the plane of its substituents of 0.344(5) and 0.350(5) %A in molecules A and B in compound (I), as well as of 0.410(5) %A in compound (II).
penam ; optically active ; x-ray crystallography ; conformation
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Podaci o izdanju
55 (4)
1999.
656-659
objavljeno
0108-2701
1600-5759
10.1107/S0108270198015108