Synthesis of Fused Cyclopenteno- and Cyclohepteno-Heterocycles
摘要:
Cyclopenteno-triazoles, pyrazoles and isoxazoles 3a-i were synthesized from the reaction of various bishalomethyl substrates 1a-e with compounds containing active methylene groups 2a-c. In addition, seven membered ketodiesters 11 were synthesized from the reaction of 1 with dimethyl 3-oxoglutarate. Finally, from the ketodiester 11a the triazoleannelated bicyclo-undecadiones 12 were formed under phase transfer catalysis.