M. Drouin et al., UNIQUE TRANS-SYN-CIS [6.6.7]-TRICYCLE DERIVATIVE FROM TRANSANNULAR DIELS-ALDER CONTRACTION OF A MODEL 15-MEMBERED TRANS-CIS-CIS MACROCYCLICTRIENE, Acta crystallographica. Section C, Crystal structure communications, 53, 1997, pp. 1490-1493
A model 15-membered trans-cis-cis macrocyclic triene, (trans-cis-cis)-
tetramethyl (4E, 11Z,13E)-5-formylcyclopentadeca-4,11,1 3-triene-1,1,8
,8-tetracarboxylate, C-24-H32O9, was synthesized and led to the exclus
ive formation of a trans-syn-cis [6.6.7] tricyclic compound upon a tra
nsannular Diels-Alder reaction. The structure of the precursor and a p
-bromobenzoyl analog of the product, (trans-syn-cis)-tetramethyl rac-(
1S,2S,7R, 10R)-(8Z)-1-(4-bromobenzoyloxymethyl)tri 0.0(2,7)]pentadec-8
-ene-5,5,13,13-tetracarboxylate ethanol solvate, 3C(31)H(37)BrO(10).0.
76C(2)H(6)O, were determined in order to establish their exact geometr
ies and ring-junction stereochemistries.