J. Berninger et al., 2,3,6,7-tetrasubstituted perhydroanthracenes: Stereoselective synthesis and bioconformationality studies, EUR J ORG C, (4), 1999, pp. 875-884
2,3,6,7-Tetrasubstituted perhydroanthracenes with the relative configuratio
n 2 beta,3 alpha,4a alpha,6 beta,7 alpha,8a beta,9a alpha, 10a beta have be
en synthesized stereoselectively. The biconformationality of these compound
s has been investigated in solution by NMR and in the solid state by X-ray
crystallography. A triple-ring flip 2 --> 3 was realized for the first time
by the covalently induced transition 29 --> 30.