The new medium membered heterocycles (2c–i), additionally strained due to internal substituents, could be obtained after optimization of a simple one-step cyclisation reaction; the barrier of the restricted rotations of the phenyl ring in (2h) and of the t-butyl group in (2i) were measured; the X-ray, NMR, and CD data of the stable enantiomers of (2c–i) are compared with those of the less strained
作者:Voegtle, Fritz、Knops, Peter、Ostrowicki, Andreas
DOI:——
日期:——
VOGTLE, FRITZ;KNOPS, PETER;OSTROWICKI, ANDREAS, CHEM. BER., 123,(1990) N, C. 1859-1868
作者:VOGTLE, FRITZ、KNOPS, PETER、OSTROWICKI, ANDREAS
DOI:——
日期:——
MITCHELL, R. H.;WEERAWARNA, K. S.;BUSHNELL, G. W., TETRAHEDRON LETT., 1984, 25, N 9, 907-910
作者:MITCHELL, R. H.、WEERAWARNA, K. S.、BUSHNELL, G. W.
DOI:——
日期:——
Cyclophanes with large internal substituents. The synthesis and conformational behavior of 2,11-dithia [3,3]metacyclophanes and a [2,2] metacylophane with -butyl substituents.
作者:Reginald H. Mitchell、Kumudini S. Weerawarna、Gordon W. Bushnell
DOI:10.1016/s0040-4039(01)80059-9
日期:1984.1
The preparation, 1Hmr spectra and stereochemistry of 1E , 3E , 2F ,3F and 2G are described. The stereochemistry of 3E is supported by an X-ray structure determination.