Cyclopenteno-triazoles, pyrazoles and isoxazoles 3a-i were synthesized
from the reaction of various bishalomethyl substrates 1a-e with compo
unds containing active methylene groups 2a-c. In addition, seven membe
red ketodiesters 11 were synthesized from the reaction of 1 with dimet
hyl 3-oxoglutarate. Finally, from the ketodiester 11a the triazoleanne
lated bicyclo-undecadiones 12 were formed under phase transfer catalys
is.