Jd. Winkler et al., STEREOSELECTIVE SYNTHESIS OF POLYCYCLIC RING-SYSTEMS VIA THE TANDEM DIELS-ALDER REACTION, Journal of organic chemistry, 59(23), 1994, pp. 6879-6881
Intermolecular Diels-Alder reaction of a monoprotected bis-diene with
a bis-dienophile, followed by deprotection on the second diene moeity
and a second intramolecular Diels-Alder reaction, leads to the stereos
elective construction of polycyclic ring systems with high level of st
ereochemical control.