J. Benkhoff et al., SYNTHESIS OF STERICALLY RIGID MACROCYCLES BY THE USE OF PRESSURE-INDUCED REPETITIVE DIELS-ALDER REACTIONS, Tetrahedron letters, 35(1), 1994, pp. 73-76
Syntheses of the syn-dimethanotetrahydroanthracene and -tetracene deri
vatives 2a.d and 6a,b are described. Highly stereoselective, pressure-
induced repetitive Diels-Alder reactions of these bis-dienophiles with
bisdiene 7 lead to the sterically rigid macrocycles 10a, 10d, 13a and
14a,b having well defined cavities of different size.