Sh. Tsai et al., SYNTHESIS OF XAPENTACYCLO[7.2.1.0(2,8).0(4,11).0(6,10)]DODECANE - A NOVEL DIACETAL TRIOXA-CAGE, Journal of the Chinese Chemical Society, 43(5), 1996, pp. 445-449
5,7-Trioxapentacyclo[7.2.1.0(2,8).0(4,11).0(6,10)] dodecane, the paren
t compound of novel diacetal trioxa-cages, was synthesized from maleic
anhydride cyclopentadiene adduct 1 by a four-step sequence. Attempts
for the synthesis of monoaza dioxa-cage 12 failed. Ozonolysis of compo
und 9 in CH2Cl2-EtOH (1:1) at -78 degrees C followed by reduction with
Me(2)S gave 13 in 65% yield.