Regiocontrolled cyclisation of acetylenic ketones. First example of selective desilylation of a triple bond in the presence of a silyl enol ether.
The thermal cyclisation of the butynylbicyclooctanone 5a is non regiospecific, and leads to products having a propellane or a cedrane skeleton.Conditions allowing exclusive formation of either type of products are given.
Drouin, J.,Boaventura, M. A.
p. 3923 - 3926
(2007/10/02)
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