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Dianions and masked dianions represent important building blocks
for the regioselective formation of carbon-carbon bonds.
Cyclocondensation reactions of 1,3-bis(silyl enol ethers) with
different mono(silyl enol ethers) provide an elegant approach for
the synthesis of various complex carba- and heterocycles from
simple starting materials. A variety of functionalized and
sterically encumbered triarylmethanes were prepared by combination
of FeCl3-catalyzed benzylations of 1,3-diketones and formal 3]3]
cyclocondensation reactions of 1,3-bis(silyl enol ethers) and
3-benzyl-1-silyloxy-1-en-3-ones. Subsequently, 4-methoxy-, 4-chloro
and 4-flulro-substituted triarylmethanes are prepared The products
are not readily available by other methods. In addition,
functionalized diarylmethanes have been also prepared by
cyclocondensation of 1.3-bis(silyl enol ethers) with with
respective 3-benzyl-1-silyloxy-1-en-3-ones. Further more, dianions
were converted to useful cyclic structure of pyranones with
functionalized benzaldehydes providing a new strategy. Varius
pyranones were synthecized containing 3-bromo-, 4-Methyl-,
4Phenyl-, 4-methoxy- and 4-hydoxy-phenyle groups.
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