Tetrahedron Letters p. 5241 - 5244 (1988)
Update date:2022-08-05
Topics:
Schinzer, Dieter
Kalesse, Markus
Kabbara, Jazid
Mixed ketene acetals of type 2 undergo smooth cyclization upon treatment with silica gel yielding diastereoselectively bicyclo<2.2.2>octanones of type 3.Alternatively, the same result was obtained by exposure of the substrates to TiCl4 at low temperature.
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